@article {1443,
	title = {Lanthanide(III) and group 13 metal ion complexes of tripodal amino phosphinate ligands},
	journal = {Dalton Transactions},
	number = {1},
	year = {2006},
	note = {ISI Document Delivery No.: 993PUTimes Cited: 2Cited Reference Count: 23},
	pages = {31-38},
	type = {Article},
	abstract = {The tripodal amino-phosphinate ligands, tris(4-(phenylphosphinato)-3-benzyl-3-azabutyl) amine (H(3)ppba center dot 2HCl center dot H2O) and tris(4-(phenylphosphinato)-3-azabutyl) amine (H(3)ppa center dot HCl center dot H2O) were synthesized and reacted with Al3+, Ga3+, In3+ and the lanthanides (Ln(3+)). At 2 : 1 H(3)ppba to metal ratios, complexes of the type [M(H(3)ppba)(2)](3+) (M = Al3+, Ga3+, In3+, Ho3+-Lu3+) were isolated. The bicapped [Ga(H(3)ppba)(2)](NO3)(2)Cl center dot 3CH(3)OH was structurally characterized and was shown indirectly by various techniques to be isostructural with the other [M(H(3)ppba)(2)](3+) complexes. Also, at 2:1 H(3)ppba to metal ratios, complexes of the type [M(H(4)ppba)(2)](5+) (M = La3+-Tb3+) were characterized, and the X-ray structure of [Gd(H(4)ppba)(2)](NO3)(4)Cl center dot 3CH(3)OH was determined. At 1:1 H(3)ppba to metal ratios, complexes of the type [M(H(4)ppba)](4+) (M = La3+-Er3+) were isolated and characterized. Elemental analysis and spectroscopic evidence supported the formation of a 1:1 monocapped complex. Reaction of 1:1 ratios of H(3)ppa with Ln(3+) and In3+ yielded complexes of the type [M(H(3)ppa)](3+) (M = La3+-Yb3+) but with Ga3+, complex of the type [Ga(ppa)]center dot 3H(2)O was obtained. Reaction of 1:1 ratios of H(3)ppa with Ln(3+) and In3+ yielded complexes of the type [M(H(3)ppa)](3+) (M = La3+-Yb3+) but with Ga3+ a neutral complex [Ga(ppa)]center dot 3H(2)O was obtained. The formation of an encapsulated 1:1 complex is supported by elemental analysis and spectroscopic evidence.},
	keywords = {ACID, BEARING, CIRCULARLY-POLARIZED LUMINESCENCE, CONTRAST AGENTS, MAGNETIC-RESONANCE, NMR, RELAXOMETRY},
	isbn = {1477-9226},
	url = {<Go to ISI>://000233968200004},
	author = {Kovacs, M. S. and Monga, V. and Patrick, B. O. and Orvig, Chris}
}
@article {1443,
	title = {Lanthanide(III) and group 13 metal ion complexes of tripodal amino phosphinate ligands},
	journal = {Dalton Transactions},
	number = {1},
	year = {2006},
	note = {ISI Document Delivery No.: 993PUTimes Cited: 2Cited Reference Count: 23},
	pages = {31-38},
	type = {Article},
	abstract = {The tripodal amino-phosphinate ligands, tris(4-(phenylphosphinato)-3-benzyl-3-azabutyl) amine (H(3)ppba center dot 2HCl center dot H2O) and tris(4-(phenylphosphinato)-3-azabutyl) amine (H(3)ppa center dot HCl center dot H2O) were synthesized and reacted with Al3+, Ga3+, In3+ and the lanthanides (Ln(3+)). At 2 : 1 H(3)ppba to metal ratios, complexes of the type [M(H(3)ppba)(2)](3+) (M = Al3+, Ga3+, In3+, Ho3+-Lu3+) were isolated. The bicapped [Ga(H(3)ppba)(2)](NO3)(2)Cl center dot 3CH(3)OH was structurally characterized and was shown indirectly by various techniques to be isostructural with the other [M(H(3)ppba)(2)](3+) complexes. Also, at 2:1 H(3)ppba to metal ratios, complexes of the type [M(H(4)ppba)(2)](5+) (M = La3+-Tb3+) were characterized, and the X-ray structure of [Gd(H(4)ppba)(2)](NO3)(4)Cl center dot 3CH(3)OH was determined. At 1:1 H(3)ppba to metal ratios, complexes of the type [M(H(4)ppba)](4+) (M = La3+-Er3+) were isolated and characterized. Elemental analysis and spectroscopic evidence supported the formation of a 1:1 monocapped complex. Reaction of 1:1 ratios of H(3)ppa with Ln(3+) and In3+ yielded complexes of the type [M(H(3)ppa)](3+) (M = La3+-Yb3+) but with Ga3+, complex of the type [Ga(ppa)]center dot 3H(2)O was obtained. Reaction of 1:1 ratios of H(3)ppa with Ln(3+) and In3+ yielded complexes of the type [M(H(3)ppa)](3+) (M = La3+-Yb3+) but with Ga3+ a neutral complex [Ga(ppa)]center dot 3H(2)O was obtained. The formation of an encapsulated 1:1 complex is supported by elemental analysis and spectroscopic evidence.},
	keywords = {ACID, BEARING, CIRCULARLY-POLARIZED LUMINESCENCE, CONTRAST AGENTS, MAGNETIC-RESONANCE, NMR, RELAXOMETRY},
	isbn = {1477-9226},
	url = {<Go to ISI>://000233968200004},
	author = {Kovacs, M. S. and Monga, V. and Patrick, B. O. and Orvig, Chris}
}
@article {1524,
	title = {Unambiguous determination of the ionization state of a glycoside hydrolase active site lysine by H-1-N-15 heteronuclear correlation spectroscopy},
	journal = {Journal of the American Chemical Society},
	volume = {128},
	number = {48},
	year = {2006},
	note = {ISI Document Delivery No.: 110GSTimes Cited: 15Cited Reference Count: 15Poon, David K. Y. Schubert, Mario Au, Jason Okon, Mark Withers, Stephen G. McIntosh, Lawrence P.},
	month = {Dec},
	pages = {15388-15389},
	type = {Article},
	keywords = {AMINO-ACIDS, beta, EXCHANGE, MAGNETIC-RESONANCE, NMR, PROTEINS},
	isbn = {0002-7863},
	url = {<Go to ISI>://000242367000018},
	author = {Poon, D. K. Y. and Schubert, M. and Au, J. and Okon, M. and Withers, S. G. and McIntosh, L. P.}
}
@article {860,
	title = {Muonium formation as a probe of radiation chemistry in sub- and supercritical carbon dioxide},
	journal = {Journal of Physical Chemistry A},
	volume = {108},
	number = {52},
	year = {2004},
	note = {ISI Document Delivery No.: 882FPTimes Cited: 5Cited Reference Count: 97},
	month = {Dec},
	pages = {11613-11625},
	type = {Article},
	abstract = {Muonium (Mu = mu(+)e(-)), which can be considered a light isotope of the H atom, has been observed for the first time in supercritical CO2 (ScCo2). It is Unreactive on a time scale of a few microseconds and over a wide density range from well below to well above the CO2 critical density rho(c) = 0.47 g/cm(3). The fraction of muon polarization in muonium, P-Mu, does not vary significantly at low densities but changes quickly at the highest densities, approaching zero. This density dependence is reflected in a concomitant increase observed in the lost fraction of polarization, P-L, demonstrating that the dynamics of Mu formation and depolarization in ScCO2 is a direct probe of radiolysis effects in the terminal muon radiation track. In marked contrast to previous studies in hydrogen-containing solvents, C2H6 and H2O, over comparable density ranges, the diamagnetic fraction, P-D, was found to be almost independent of density in CO2, attributed to the formation of the stable solvated MuCO(2)(+) molecular ion in this hydrogen-free solvent. The differing density dependences of both the Mu and the diamagnetic fraction in Co-2, in comparison with the rather similar trends seen for both in C2H6 and H2O, supports previous claims of a significant role played by proton (muon) transfer reactions in the competing processes involved in Mu formation in hydrogen-containing solvents. In addition to this being the first report of radiolysis effects accompanying energetic positive muons stopping in ScCO2, it is the only report of end of track effects in this solvent, which has many applications in nuclear waste management and green chemistry. With a mass intermediate between that of the electron, which has provided most radiation-chemistry studies in ScCO2 to date, and the proton (or alpha-particle), implanted muons provide a unique data set, characteristic of higher LET radiation, that may be relevant to radiolysis effects induced in ScCO2 by alpha decay from heavy nuclei, for which there are no comparable studies.},
	keywords = {AQUEOUS-SOLUTIONS, CROSS-SECTIONS, EXCESS ELECTRON-TRANSPORT, GAS-PHASE, LIQUID WATER, MAGNETIC-RESONANCE, ORGANIC FREE-RADICALS, PRESSURE-DEPENDENCE, relaxation, SOLVENT ANIONS, SPIN},
	isbn = {1089-5639},
	url = {<Go to ISI>://000225924800018},
	author = {Ghandi, K. and Bridges, M. D. and Arseneau, D. J. and Fleming, Donald G.}
}
@article {685,
	title = {An analytical formulation of CPMAS},
	journal = {Solid State Nuclear Magnetic Resonance},
	volume = {23},
	number = {1-2},
	year = {2003},
	note = {ISI Document Delivery No.: 662PWTimes Cited: 4Cited Reference Count: 21},
	month = {Feb-Mar},
	pages = {28-49},
	type = {Article},
	abstract = {An exact expression for the cross polarization between two spin1/2 particles is derived from the quantum Liouville equation. This is given in the form of two integrodifferential equations. These can be solved exactly in the static case (no sample spinning) and a powder average easily performed numerically. With magic-angle spinning, the neglect of certain interference terms simplifies the numerical calculation. A further assumption decoupling the calculation of the sidebands gives a very simple formula that is capable of giving a qualitative interpretation of all experimental observations. Examples are given illustrating typical buildup curves and CPMAS matching profiles. (C) 2002 Elsevier Science (USA). All rights reserved.},
	keywords = {CPMAS, cross polarization, CROSS-POLARIZATION EXPERIMENTS, DYNAMICS, equation, generalized master equation, magic-angle spinning, MAGNETIC-RESONANCE, NMR, quantum Liouville, SOLIDS, TRANSIENT OSCILLATIONS},
	isbn = {0926-2040},
	url = {<Go to ISI>://000181957200003},
	author = {Marica, F. and Snider, R. F.}
}
@article {375,
	title = {Hyperfine and host-guest interactions of the Mu-cyclohexadienyl radical in NaY zeolite},
	journal = {Journal of Physical Chemistry B},
	volume = {106},
	number = {25},
	year = {2002},
	note = {ISI Document Delivery No.: 565EUTimes Cited: 8Cited Reference Count: 88},
	month = {Jun},
	pages = {6395-6407},
	type = {Article},
	abstract = {The adsorption and dynamical behavior of the muonated cyclohexadienyl radical (C(6)H(6)Mu) in NaY zeolite, formed by muonium (Mu) addition on adsorbed benzene. was investigated by the muon spin resonance (muSR) technique, primarily at loadings of 2-3 C6H6 molecules per supercage of NaY. The dynamics of this radical are expected to be the same as its isotopic analogue, C6H7, for which there are no similar data available. Both TF-muSR and ALC-muSR spectra were recorded, with the most detailed information provided by the positions and line widths of the avoided level crossing resonances. In concert with H-2 NMR, neutron diffraction and molecular dynamics studies of the parent benzene molecule, as well as current theoretical calculations, the dominant adsorption site for the C(6)H(6)Mu radical is believed to be the S-II Na cation, within a supercage, which gives rise to three observed ALC lines, corresponding to two different orientations for the muon (proton) of the CHMu methylene group: pointing toward (endo) and away (exo) from the Na cation. The cation interaction gives rise to unprecedentedly large (approximate to20\%) shifts in hyperfine coupling constants, indicative of a strong bond formed with the T electrons of the C(6)H(6)Mu radical. An additional but weaker resonance line is also seen, which is interpreted as being due to adsorption at the window sites between supercages. The ALC lines associated with the CH,,Mu radical bound to both the Na cation and window sites are all broad, approximate to1 kG, change little with temperature and exhibit mainly static line shapes over the whole temperature range studied, from 3 to 322 K. This indicates a much stronger host-guest interaction for C(6)H(6)Mu, particularly with the Na cation. than is known for benzene, to the extent that this site acts as an effective trap for the free radical, over the critical muSR time scale of 50 ns.},
	keywords = {AROMATIC-MOLECULES, ELASTIC NEUTRON-SCATTERING, GAS-PHASE, H-2 NMR, MAGNETIC-RESONANCE, MOLECULAR-DYNAMICS, RAY-POWDER DIFFRACTION, REORIENTATIONAL DYNAMICS, SODIUM-Y ZEOLITE, SPIN RELAXATION},
	isbn = {1520-6106},
	url = {<Go to ISI>://000176356700007},
	author = {Fleming, Donald G. and Shelley, M. Y. and Arseneau, D. J. and Senba, M. and Pan, J. J. and Roduner, E.}
}
@article {5027,
	title = {Pressure-induced change in orientational order of solutes in liquid crystals},
	journal = {Chemical Physics Letters},
	volume = {337},
	number = {4-6},
	year = {2001},
	note = {ISI Document Delivery No.: 420BPTimes Cited: 1Cited Reference Count: 20},
	month = {Apr},
	pages = {248-254},
	type = {Article},
	abstract = {The H-1 and H-1 NMR spectroscopy of the nematic liquid crystal ZLI 1132 containing small amounts of the solutes 1,3,5- trichlorobenzene. p-dichlorobenzene and acetone was investigated as a function of the pressure of a mixture of molecular hydrogen and deuterium gases above the sample. A general increase of solute orientational order with pressure was observed. Differences in behavior of the orientational order of the hydrogens compared to the other solutes are discussed. (C) 2001 Elsevier Science B.V. All rights reserved.},
	keywords = {COMPUTER-SIMULATION, density, MAGNETIC-RESONANCE, MOLECULES, NEMATIC PHASE, NMR, SOLVENTS, TEMPERATURE-DEPENDENCE},
	isbn = {0009-2614},
	url = {<Go to ISI>://000167984300004},
	author = {Burnell, E. E. and de Lange, C. A. and Gaemers, S.}
}
@article {4728,
	title = {Reorientational dynamics of aza-cyclohexadienyl radicals in pyridinium tetrafluoroborate},
	journal = {Physica B-Condensed Matter},
	volume = {289},
	year = {2000},
	note = {ISI Document Delivery No.: 330GBTimes Cited: 8Cited Reference Count: 128th International Conference on Muon Spin Rotation, Relaxation and ResonanceAUG 30-SEP 03, 1999LES DIABLERETS, SWITZERLANDEuropean Phys Soc, Paul Scherrer Inst, Eidgenoss Tech Hochschule, Univ Zurich, European Sci Fdn, Swiss Natl Sci Fdn, Neue Aargauer Bank, Sauerstoffwerk Lenzburg AG, Hamamatsu Photon, EG \& G Berthold GmbH \& Co KG, Prophysik AG, Kroger \& Co, Wenger SA, Alcatel Hochvakuum Tech GmbH, Sunrise AG, Dramer AG, Automobil \& Motoren AG},
	month = {Aug},
	pages = {607-611},
	type = {Proceedings Paper},
	abstract = {{Pyridinium tetrafluoroborate is a ferroelectric with a paraelectric-ferroelectric phase transition of second order, which is exceptional for multidirectional ferroelectrics, Avoided-level-crossing muon-spin resonance has been used to show that the Mu substituted aza-cyclohexadienyl radical derived from the pyridinium ions undergoes fast uniaxial rotation around the axis perpendicular to the molecular plane, confirming earlier results by Czarnecki et al. The changes in reorientational dynamics between 239 and 244 K also verify the existence of a phase transition in this range, as found by Czarnecki. Furthermore, the results give strong evidence that superimposed on the rotation there is a wobbling motion of the rotational axis which freezes in at the first transition temperature},
	keywords = {avoided-level-crossing muon-spin resonance, cyclohexadienyl radical, MAGNETIC-RESONANCE, PHASE-TRANSITION, pyridinium, REORIENTATIONAL DYNAMICS, TETRAFLUOROBORATE, VARIANT},
	isbn = {0921-4526},
	url = {<Go to ISI>://000087953500159},
	author = {Beck, B. and Roduner, E. and Dilger, H. and Czarnecki, P. and Fleming, Donald G. and Reid, I. D. and Rhodes, C. J.}
}
@article {4705,
	title = {Kinetic and mechanistic aspects of sulfur recovery from Pd2I2(mu-S)(mu-dpm)(2) using I-2 and structures of Pd(II) complexes with the chelated monosulfide of dpm},
	journal = {Inorganic Chemistry},
	volume = {38},
	number = {9},
	year = {1999},
	note = {ISI Document Delivery No.: 194LGTimes Cited: 21Cited Reference Count: 46},
	month = {May},
	pages = {2143-2149},
	type = {Article},
	abstract = {The Pd2X2(mu-S)(dpm)(2) complexes (2) (X = I, Br) react with halogens to yield PdX2(dpm) (3) and elemental sulfur. Kinetic and mechanistic studies on the X = I system in CHCl3 reveal that the reaction proceeds via addition of I-2 to give Pd2I4(dpm)(2) (4c), which then undergoes unimolecular decomposition to generate PdI2(dpm) (3c); the liberated sulfur concatenates to form elemental Ss The addition reaction is in the stopped-flow time regime and is first-order in both 2c and I-2, with Delta H-double dagger = 32 +/- 1 kJ mol-l and Delta S-double dagger = -91 +/- 3 J K-1 mol(-1). The slower decomposition reaction of 4c is first order in 4c, with Delta H-double dagger. = 80 +/- kJ mol(-1) and Delta S-double dagger = -26 +/- 3 J K-1 mol(-1). Byproduct PdX2(dpm(S)) (5) [dpm(S) = Ph2PCH2P(S)Ph-2] also forms under some conditions via reaction of 3 with an S, species (n < 8). Complexes 5 (X = Cl (a), Br (b), I(c)) were also synthesized directly, and the structure of the 5c species, as well as of [Pd(dpm(S))(2)]Cl-2, were determined by X-ray analyses that reveal the envelope configuration of the five-membered Pd-PPh2CH2P(S)Ph-2 chelate ring.},
	keywords = {bis(diphenylphosphino)methane, CONVERSION, COORDINATION CHEMISTRY, HYDROGEN-SULFIDE, LIGANDS, MAGNETIC-RESONANCE, MOLECULAR-STRUCTURES, palladium, RAY CRYSTAL-STRUCTURE, SE},
	isbn = {0020-1669},
	url = {<Go to ISI>://000080194500029},
	author = {Wong, T. Y. H. and Rettig, S. J. and James, Brian R.}
}
@article {4676,
	title = {NMR and molecular structure of partially oriented mono and para methyl- and chlorobenzenes dissolved in nematic liquid crystals},
	journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie},
	volume = {77},
	number = {11},
	year = {1999},
	note = {ISI Document Delivery No.: 253FETimes Cited: 8Cited Reference Count: 69},
	month = {Nov},
	pages = {1761-1774},
	type = {Article},
	abstract = {Spectral parameters, order parameters, and structural parameters, including the vibrationally corrected r(alpha) structure of the partially oriented solutes p-xylene, p-chlorotoluene, p-dichlorobenzene, toluene, and chlorobenzene dissolved in three liquid crystal mixtures, are reported. For samples containing the three solutes p-xylene, p-dichlorobenzene, and 1,3,5-trichlorobenzene, multiple quantum (MQ) nuclear magnetic resonance was used to aid in the analysis of the complex high-resolution spectra of the g-xylene. The high-resolution spectra of 1,3,5-trichlorobenzene and p-dichlorobenzene were easily identified and analyzed once the calculated p-xylene spectrum was subtracted from the experimental one. The methyl groups of p-xylene, p-chlorotoluene, and toluene have similar geometries when the structure is determined from dipolar couplings corrected for harmonic vibrations.},
	keywords = {ELECTRIC-DIPOLE INTERACTIONS, EXCITATION, H-2 NMR, MAGNETIC-RESONANCE, MEAN TORQUE, molecular structure, MULTIPLE-QUANTUM NMR, nematic liquid crystal, NMR, ORDER MATRIX, order parameter, SELECTIVE, SOLUTES, SOLVENTS, SPECTRA},
	isbn = {0008-4042},
	url = {<Go to ISI>://000083545300009},
	author = {Syvitski, R. T. and Burnell, E. E.}
}
@article {4114,
	title = {Analysis of single and multiple quantum NMR spectra of 1,3-dichloro-2-ethenylbenzene in liquid crystal solvents},
	journal = {Molecular Physics},
	volume = {90},
	number = {4},
	year = {1997},
	note = {ISI Document Delivery No.: WN909Times Cited: 10Cited Reference Count: 37},
	month = {Mar},
	pages = {541-551},
	type = {Article},
	abstract = {The single and multiple quantum NMR spectra of 1,3-dichloro-2-ethenylbenzene as solute in two different nematic liquid crystals have been measured and analysed in terms of dipolar couplings and chemical shift differences. Because the single quantum spectra did not yield to straightforward analysis, normal and frequency selective multiple quantum experiments were used to aid the analysis. The results from four spectra were combined to yield structural information and the order matrix in each solution. The structure of the ring is very close to that of 1,3-dichlorobenzene, and that of the ethenyl group very close to that of ethenyl-benzene. The dihedral angle between the ethenyl group and the aromatic ring is found to be 454 +/- 1.0 degrees, and the C-CC=C angle is found to be 127.3 +/- 0.3 degrees.},
	keywords = {EQUILIBRIUM, FIELD, MAGNETIC-RESONANCE, MIXTURES, MOLECULAR-STRUCTURE, orientational order, ROTATION, SHAPE, SOLUTES, SPECTROSCOPY},
	isbn = {0026-8976},
	url = {<Go to ISI>://A1997WN90900005},
	author = {Rendell, J. C. T. and Burnell, E. E.}
}
@article {4139,
	title = {Comparative inhibition of yeast glutathione reductase by arsenicals and arsenothiols},
	journal = {Chemical Research in Toxicology},
	volume = {10},
	number = {1},
	year = {1997},
	note = {ISI Document Delivery No.: WD805Times Cited: 165Cited Reference Count: 30},
	month = {Jan},
	pages = {27-33},
	type = {Article},
	abstract = {Tri(gamma-glutamylcysteinylglycinyl)trithioarsenite (As-III(GS)(3)) is formed in cells and is a more potent mixed-type inhibitor of the reduction of glutathione disulfide (GSSG) by yeast glutathione (GSH) reductase than either arsenite (As-III) or GSH. The present work examines the effects of valence and complexation of arsenicals with GSH or L-cysteine (Cys) upon potency as competitive inhibitors of the reduction of GSH disulfide (GSSG) by yeast GSH reductase. Trivalent arsenicals were more potent inhibitors than their pentavalent analogs, and methylated trivalent arsenicals were more potent inhibitors than was inorganic trivalent As. Complexation of either inorganic trivalent As or methylarsonous diiodide ((CH3AsI2)-I-III) with Cys or GSH produced inhibitors of GSH reductase that were severalfold more potent than the parent arsenicals. In contrast, dimethylarsinous iodide ((CH3)(2)(AsI)-I-III) was a more potent inhibitor than its complexes with either GSH or Cys. Complexes of CH3AsIII with GSH (CH3AsIII(GS)(2)) or with Cys (CH3AsIII(Cys)(2)) were the most potent inhibitors, with K-i{\textquoteright}s of 0.009 and 0.018 mM, respectively. Inhibition of GSH reductase by arsenicals or arsenothiols was prevented by addition of meso-2,3-dimercaptosuccinic acid (DMSA) to a mixture of enzyme, GSSG, and inhibitor before addition of NADPH. DMSA added to the reaction mixture after NADPH reversed inhibition by (CH3)(2)(AsI)-I-III but had little effect on inhibition by (CH3AsI2)-I-III, CH3AsIII(GS)(2), CH3AsIII(Cys)(2), Or AS(III)(GS)(3). Partial redox inactivation of the enzyme with NADPH increased the inhibitory potency of (CH3AsI2)-I-III and (CH3)(2)(AsI)-I-III and changed the mode of inhibition for (CH3AsI2)-I-III from competitive to noncompetitive. The greater potency of methylated trivalent arsenicals and arsenothiols than of inorganic trivalent As suggests that biomethylation of As could yield species that inhibit reduction of GSSG and alter the redox status of cells.},
	keywords = {BINDING, DIMERCAPTOSUCCINIC ACID, Disulfide, MAGNETIC-RESONANCE, MICE, PHENYLDICHLOROARSINE, RABBIT ERYTHROCYTES},
	isbn = {0893-228X},
	url = {<Go to ISI>://A1997WD80500004},
	author = {Styblo, M. and Serves, S. V. and Cullen, W. R. and Thomas, D. J.}
}
@article {4115,
	title = {Orientational order of 1,3-dichloro-2-ethenylbenzene in liquid crystal solvents},
	journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie},
	volume = {75},
	number = {8},
	year = {1997},
	note = {ISI Document Delivery No.: XX043Times Cited: 2Cited Reference Count: 38},
	month = {Aug},
	pages = {1156-1161},
	type = {Article},
	abstract = {The order parameter matrices of a molecule that has no symmetry, 1,3-dichloro-2-ethenylbenzene, dissolved in two different nematic liquid-crystal solvents are analyzed in terms of various models for the intermolecular mean-field potential. In a mixture of liquid crystals for which the interaction between the molecular quadrupole moment tensor and the average electric field gradient of the nematic solvent has been minimized, the orientational order is best described by models for the short-range anisotropic potential. The most successful potentials are written in terms of anisotropic interactions between the solute surface and the liquid-crystal mean field. This represents a strong test of such models because they simultaneously fit the five independent orientational parameters obtained from the same solute, thus removing the problems associated with comparing results among different solutes in either the same or a different sample tube.},
	keywords = {ALKYL CHAINS, ANISOTROPIC, FIELD, INTERMOLECULAR FORCES, liquid crystals, MAGNETIC-RESONANCE, MIXTURES, MOLECULES, NEMATIC SOLVENT, NMR, order parameters, PHASES, SHAPE, SOLUTES},
	isbn = {0008-4042},
	url = {<Go to ISI>://A1997XX04300014},
	author = {Rendell, J. C. T. and Zimmerman, D. S. and vanderEst, A. J. and Burnell, E. E.}
}
@article {3664,
	title = {Spin relaxation of muonium-substituted ethyl radicals (MuCH(2)CH(2)) in the gas phase},
	journal = {Journal of Chemical Physics},
	volume = {105},
	number = {17},
	year = {1996},
	note = {ISI Document Delivery No.: VP288Times Cited: 20Cited Reference Count: 84},
	month = {Nov},
	pages = {7517-7535},
	type = {Article},
	abstract = {The spin relaxation of the muonium-substituted ethyl radical (MuCH(2)CH(2)) and its deuterated analog (MuCD(2)CD(2)) has been studied in the gas phase in both transverse and longitudinal magnetic fields spanning the range similar to 0.5-35 kG, over a pressure range from similar to 1-16 atm at ambient temperature. The Mu(13)CH(2)(13)CH(2) radical has also been investigated, at 2.7 atm. For comparison, some data is also reported for the MuCH(2)C(CH3)(2) (Mu-t-butyl) radical at a pressure of 2.6 atm. This experiment establishes the importance of the mu SR technique in studying spin relaxation phenomena of polyatomic radicals in the gas phase, where equivalent ESR data is sparse or nonexistent. Both T-1 (longitudinal) and T-2 (transverse) mu SR relaxation rates are reported and interpreted with a phenomenological model. Relaxation results from fluctuating terms in the spin Hamiltonian, inducing transitions between the eigenstates assumed from an isotropic hyperfine interaction. Low-field relaxation is primarily due to the electron, via both the nuclear hyperfine (S . A . I) and the spin rotation interactions (S . J), communicated to the muon via the isotropic muon-electron hyperfine interaction. At the highest fields, direct spin flips of the muon become important, due to fluctuations in the anisotropic part of the muon-electron hyperfine interaction. In the intermediate held region a muon-electron {\textquoteright}{\textquoteright}flip-flop{\textquoteright}{\textquoteright} relaxation mechanism dominates, due partly to the anisotropic hyperfine interaction and partly to modulation of the isotropic muon-electron hyperfine coupling. In the case of the T-2 rates, electron relaxation mechanisms dominate over a much wider field range than for the T-1 rates, and inhomogeneous line broadening also contributes. The fluctuations that induce both the T-1 and T-2 relaxation rates are described by a single correlation time, tau(c), inversely proportional to the pressure. An effective spin-reorientation cross section is deduced from this pressure dependence, sigma(J) similar to 100+/-20 Angstrom(2), for all topically substituted ethyl radicals. This is similar to the geometrical cross section, but about a factor of 4 larger than values of sigma(J) found for similar-sized diamagnetic molecules by gas phase NMR, primarily reflecting the longer range of the electron-induced intermolecular potential. (C) 1996 American Institute of Physics.},
	keywords = {ADDITION-REACTIONS, DYNAMICS, EXCHANGE, HYPERFINE COUPLING-CONSTANTS, INTERNAL-ROTATION, LATTICE RELAXATION, LEVEL-CROSSING, MAGNETIC-RESONANCE, MUONATED RADICALS, ORGANIC FREE-RADICALS, SPECTROSCOPY},
	isbn = {0021-9606},
	url = {<Go to ISI>://A1996VP28800027},
	author = {Fleming, Donald G. and Pan, J. J. and Senba, M. and Arseneau, D. J. and Kiefl, R. F. and Shelley, M. Y. and Cox, S. F. J. and Percival, P. W. and Brodovitch, J. C.}
}
@article {2983,
	title = {COMPARISON OF SHORT-RANGE INTERACTIONS IN NEMATIC LIQUID-CRYSTALS - A H-2-NMR STUDY OF 5CB-D(19) AS A SOLUTE},
	journal = {Liquid Crystals},
	volume = {17},
	number = {4},
	year = {1994},
	note = {ISI Document Delivery No.: PH470Times Cited: 4Cited Reference Count: 42},
	month = {Oct},
	pages = {457-485},
	type = {Article},
	abstract = {Previous studies using dideuterium as a solute have demonstrated the importance for orientation of the interaction between the solute molecular quadrupole moment and the average electric field gradient present in liquid crystals. With the aim of learning about additional orientational mechanisms, we have studied the temperature dependence of the H-2-NMR spectra of the liquid crystal 5CB-d(19) as the solute in three liquid crystal mixtures: 55 wt \% 1132/EBBA, 56.5 wt \% 1132/EBBA and 70 wt \% 5CB/EBBA. In these mixtures, the contribution from the environment to the average electric field gradient at the H-2 nucleus of dideuterium is zero. The spectra of 5CB-d(19) in the mixtures 55 wt \% 1132/EBBA and 56.5 wt \% 1132/EBBA are equivalent, but are different from those in 70 wt \% 5CB/EBBA. The spectra of 5CB in 55 wt \% 1132/EBBA and 70 wt \% 5CB/EBBA are analysed using two different models for the short range potential, and parameters of the models are used to compare the potentials in the different mixtures. For a given spectral splitting of the chain C-1 deuteron, the reduced short range potential is the same in all three mixtures studied. The spectral differences observed are a consequence of different nematic-isotropic phase transition temperatures combined with the effect of trans/gauche-isomerization in the hydrocarbon chain.},
	keywords = {BINARY-MIXTURES, EQUILIBRIUM, FLEXIBILITY, MAGNETIC-RESONANCE, MOLECULAR-STRUCTURE, MULTIPLE-QUANTUM NMR, NORMAL-BUTANE, orientational order, RAMAN-SPECTRA, SPECTROSCOPY},
	isbn = {0267-8292},
	url = {<Go to ISI>://A1994PH47000001},
	author = {Chandrakumar, T. and Zimmerman, D. S. and Bates, G. S. and Burnell, E. E.}
}
@article {2983,
	title = {COMPARISON OF SHORT-RANGE INTERACTIONS IN NEMATIC LIQUID-CRYSTALS - A H-2-NMR STUDY OF 5CB-D(19) AS A SOLUTE},
	journal = {Liquid Crystals},
	volume = {17},
	number = {4},
	year = {1994},
	note = {ISI Document Delivery No.: PH470Times Cited: 4Cited Reference Count: 42},
	month = {Oct},
	pages = {457-485},
	type = {Article},
	abstract = {Previous studies using dideuterium as a solute have demonstrated the importance for orientation of the interaction between the solute molecular quadrupole moment and the average electric field gradient present in liquid crystals. With the aim of learning about additional orientational mechanisms, we have studied the temperature dependence of the H-2-NMR spectra of the liquid crystal 5CB-d(19) as the solute in three liquid crystal mixtures: 55 wt \% 1132/EBBA, 56.5 wt \% 1132/EBBA and 70 wt \% 5CB/EBBA. In these mixtures, the contribution from the environment to the average electric field gradient at the H-2 nucleus of dideuterium is zero. The spectra of 5CB-d(19) in the mixtures 55 wt \% 1132/EBBA and 56.5 wt \% 1132/EBBA are equivalent, but are different from those in 70 wt \% 5CB/EBBA. The spectra of 5CB in 55 wt \% 1132/EBBA and 70 wt \% 5CB/EBBA are analysed using two different models for the short range potential, and parameters of the models are used to compare the potentials in the different mixtures. For a given spectral splitting of the chain C-1 deuteron, the reduced short range potential is the same in all three mixtures studied. The spectral differences observed are a consequence of different nematic-isotropic phase transition temperatures combined with the effect of trans/gauche-isomerization in the hydrocarbon chain.},
	keywords = {BINARY-MIXTURES, EQUILIBRIUM, FLEXIBILITY, MAGNETIC-RESONANCE, MOLECULAR-STRUCTURE, MULTIPLE-QUANTUM NMR, NORMAL-BUTANE, orientational order, RAMAN-SPECTRA, SPECTROSCOPY},
	isbn = {0267-8292},
	url = {<Go to ISI>://A1994PH47000001},
	author = {Chandrakumar, T. and Zimmerman, D. S. and Bates, G. S. and Burnell, E. E.}
}
@article {3177,
	title = {EQUATION-OF-MOTION FOR 2 COUPLED SPIN-1 NUCLEI UNDER A COHERENT AND RANDOM HAMILTONIAN},
	journal = {Physical Review B},
	volume = {50},
	number = {13},
	year = {1994},
	note = {ISI Document Delivery No.: PL412Times Cited: 8Cited Reference Count: 27},
	month = {Oct},
	pages = {9245-9257},
	type = {Article},
	abstract = {The time dependence of the density operator for two coupled spin-1 nuclei, such as dideuterium D2 and dinitrogen N-14(2), under the second rank intramolecular dipolar and the first rank spin-rotation Hamiltonians has been derived. It is shown that the relaxation rates for the ortho and para species are not identical. We report the five independent rates for the para and the 21 independent rates for the ortho species. Due to cross relaxation between spin orders which precess at a common frequency, the relaxation for the ortho configuration is not always single exponential. There are 15 cross-relaxation terms between certain spin orders for the ortho species in the slow-motion regime. The complexity of our coupled spin system is discussed for the solid and the Jeener-Broekaert echo sequences. The Zeeman spin-lattice relaxation rates R10 for ortho- and para-dideuterium have been measured experimentally in partially oriented nematic solvents at 304 K using H-2 NMR. The solvents used are PCH-7, 1132, and a 55 wt\% 1132/EBBA mixture. These oriented solvents make it possible to separate the resonances of the ortho and para configurations thereby facilitating the R10 determination directly without multiexponential analysis. The R10 of para-dideuterium is about twice that of ortho-dideuterium in all experiments. Using our calculated expressions for R10 based on quadrupolar, dipolar, and spin-rotation interactions, and performing the proper averaging over the rotational states, we obtain excellent agreement with our experimental results. Good agreement has been obtained with published low-temperature studies as well.},
	keywords = {D2, HD, LIQUID, MAGNETIC-RESONANCE, MOLECULES, relaxation, SOLVENTS, SPECTRA},
	isbn = {0163-1829},
	url = {<Go to ISI>://A1994PL41200032},
	author = {ter Beek, L. C. and Burnell, E. E.}
}
@article {2807,
	title = {SOLID-STATE DOUBLE-RESONANCE NMR EXPERIMENTS INVOLVING QUADRUPOLAR AND SPIN 1/2 NUCLEI},
	journal = {Journal of Physical Chemistry},
	volume = {97},
	number = {51},
	year = {1993},
	note = {ISI Document Delivery No.: MP905Times Cited: 101Cited Reference Count: 58},
	month = {Dec},
	pages = {13484-13495},
	type = {Article},
	abstract = {In this work we describe coherence-transfer and dipolar-dephasing double-resonance NMR experiments that demonstrate spatial proximity of quadrupolar and spin 1/2 nuclei (other than protons) in solids. These experiments exploit heteronuclear dipolar couplings, whose magnitudes are proportional to the inverse third power of the internuclear distance and are therefore extremely sensitive to the separation of the coupled spins. Coherence transfer through cross-polarization is observed in both directions between Al-27 (I = 5/2) and P-31 (I = 1/2) nuclei in the inorganic aluminophosphate framework systems VPI-5 and AlPO4-8, and an experimental investigation of the parameters controlling the efficiency of the transfer is presented. Dipolar-dephasing difference experiments, rotational-echo double-resonance (REDOR), and transferred-echo double-resonance (TEDOR) experiments under magic-angle spinning conditions are also demonstrated. Two-dimensional extensions of the cross-polarization and TEDOR experiments reveal the dipolar couplings between specific pairs of Al-27 and P-31 nuclei in two-dimensional correlation spectra, directly mapping connectivities from distinct sites with resolved NMR resonances.},
	keywords = {CROSS-POLARIZATION NMR, DOUBLE-ROTOR, MAGIC ANGLE, MAGNETIC-RESONANCE, MAS-NMR, MOLECULAR-SIEVE VPI-5, RESOLUTION, ROTATING SOLIDS, SPECTRA, SPECTROSCOPY},
	isbn = {0022-3654},
	url = {<Go to ISI>://A1993MP90500012},
	author = {Fyfe, C. A. and Mueller, K. T. and Grondey, H. and Wongmoon, K. C.}
}
@article {7238,
	title = {COHERENCE TRANSFER INVOLVING QUADRUPOLAR NUCLEI IN SOLIDS - AL-27-REVERSIBLE-ARROW-P-31 CROSS-POLARIZATION NMR IN THE MOLECULAR-SIEVE VPI-5},
	journal = {Journal of the American Chemical Society},
	volume = {114},
	number = {14},
	year = {1992},
	note = {ISI Document Delivery No.: JB980Times Cited: 57Cited Reference Count: 36},
	month = {Jul},
	pages = {5876-5878},
	type = {Note},
	keywords = {AL-27, ANGLE, ECHO DOUBLE-RESONANCE, HIGH-RESOLUTION NMR, MAGIC, MAGNETIC-RESONANCE, PROTON, SPECTROSCOPY},
	isbn = {0002-7863},
	url = {<Go to ISI>://A1992JB98000069},
	author = {Fyfe, C. A. and Grondey, H. and Mueller, K. T. and Wongmoon, K. C. and Markus, T.}
}
@article {7239,
	title = {DIPOLAR DEPHASING BETWEEN QUADRUPOLAR AND SPIN-1/2 NUCLEI - REDOR AND TEDOR NMR EXPERIMENTS ON VPI-5},
	journal = {Chemical Physics Letters},
	volume = {199},
	number = {1-2},
	year = {1992},
	note = {ISI Document Delivery No.: JV107Times Cited: 64Cited Reference Count: 21},
	month = {Oct},
	pages = {198-204},
	type = {Article},
	abstract = {In this work we examine the use of dipolar-dephasing magic-angle spinning NMR to study mixed pairs of quadrupolar and spin-1/2 nuclei in solids. Dipolar connectivities are examined in both directions between the Al-27(I=5/2) and P-31(I=1/2) spins in the very large pore aluminophosphate VPI-5, which is considered representative of a range of inorganic framework materials. Rotational-echo double-resonance (REDOR) and transferred-echo double-resonance (TEDOR) experiments are demonstrated, as well as a two-dimensional extension of the TEDOR experiment. These experiments restore the heteronuclear dipolar coupling under MAS conditions via a train of radiofrequency pulses, thereby providing information about connectivities and distances between coupled nuclei in these inorganic solids.},
	keywords = {ANGLE, COUPLINGS, DOUBLE-RESONANCE NMR, MAGIC, MAGNETIC-RESONANCE, SOLIDS, SPECTROSCOPY, TWO-DIMENSIONAL NMR},
	isbn = {0009-2614},
	url = {<Go to ISI>://A1992JV10700030},
	author = {Fyfe, C. A. and Mueller, K. T. and Grondey, H. and Wongmoon, K. C.}
}
