@article {2635,
	title = {Probing General Acid Catalysis in the Hammerhead Ribozyme},
	journal = {Journal of the American Chemical Society},
	volume = {131},
	number = {3},
	year = {2009},
	note = {ISI Document Delivery No.: 427PQTimes Cited: 5Cited Reference Count: 58Thomas, Jason M. Perrin, David M.},
	month = {Jan},
	pages = {1135-1143},
	type = {Article},
	abstract = {Recent crystallographic and computational studies have provided fresh insights into the catalytic mechanism of the RNA-cleaving hammerhead ribozyme. Based on these findings, specific ribozyme functional groups have been hypothesized to act directly as the general acid and base catalysts, although the catalytic role of divalent metal cations (M2+) remains uncertain: We now report a functional characterization of the general acid catalysis mechanism and the role of an M2+ cofactor therein, for the S. mansoni hammerhead (an "extended" hammerhead ribozyme). We have compared hammerhead cleavage of substrates with natural (ribo-phosphodiester) versus bridging-5{\textquoteright}-phosphorothioate scissile linkages, in the contexts of active site mutations and M2+ substitution. Cleavage of the natural substrate is inhibited by modification of the G8 2{\textquoteright}-OH ribozyme residue and depends strongly upon the presence and identity of an M2+ cofactor; in contrast, cleavage of the bridging-phosphorothioate substrate is conspicuously insensitive to any of these factors. These results imply that (1) both an M2+ cofactor and the G8 2{\textquoteright}-OH play crucial roles in hammerhead general acid catalysis and (2) the M2+ cofactor does not contribute to general acid catalysis via Lewis acid stabilization of the leaving group. General acid pK(a) perturbation was also demonstrated for both M2+ substitution and G8 2{\textquoteright}-OH modification, which suggests transition state M2+ coordination of the G8 2{\textquoteright}-OH, to lower its pK(a) and improve its ability to transfer a proton to the leaving group. We also report a simple method for synthesizing radiolabeled bridging-5{\textquoteright}-phosphorothioate substrates.},
	keywords = {2{\textquoteright}-HYDROXYL GROUP, ACTIVE-SITE, BASE CATALYSIS, CATIONS, MEDIATED CLEAVAGE, METAL-ION, MONOVALENT, P-31 NMR, PHOSPHOLIPASE-C, RIBONUCLEASE-A, SUBSTRATE-ANALOG},
	isbn = {0002-7863},
	url = {<Go to ISI>://000264791600054},
	author = {Thomas, J. M. and Perrin,David M.}
}
@article {1017,
	title = {Substrate specificity and kinetic framework of a DNAzyme with an expanded chemical repertoire: a putative RNaseA mimic that catalyzes RNA hydrolysis independent of a divalent metal cation},
	journal = {Nucleic Acids Research},
	volume = {32},
	number = {22},
	year = {2004},
	note = {ISI Document Delivery No.: 887METimes Cited: 24Cited Reference Count: 71},
	pages = {6660-6672},
	type = {Article},
	abstract = {This work addresses the binding, cleavage and dissociation rates for the substrate and products of a synthetic RNaseA mimic that was combinatorially selected using chemically modified nucleoside triphosphates. This trans-cleaving DNAzyme, 9(25)-11t, catalyzes sequence-specific ribophosphodiester hydrolysis in the total absence of a divalent metal cation, and in low ionic strength at pH 7.5 and in the presence of EDTA. It is the first such sequence capable of multiple turnover. 9(25)-11t consists of 31 bases, 18 of which form a catalytic domain containing 4 imidazole and 6 allylamino modified nucleotides. This sequence cleaves the 15 nt long substrate, S1, at one embedded ribocytosine at the eighth position to give a 5{\textquoteright}-product terminating in a 2{\textquoteright},3{\textquoteright}-phosphodiester and a 3{\textquoteright}-product terminating in a 5{\textquoteright}-OH. Under single turnover conditions at 24degreesC, 9(25)-11t displays a maximum first-order rate constant, k(cat), of 0.037 min(-1) and a catalytic efficiency, k(cat)/K-m, of 5.3 x 10(5) M-1 min(-1). The measured value of k(cat) under catalyst excess conditions agrees with the value of k(cat) observed for steady-state multiple turnover, implying that slow product release is not rate limiting with respect to multiple turnover. The substrate specificity of 9(25)-11t was gauged in terms of k(cat) values for substrate sequence variants. Base substitutions on the scissile ribose and at the two bases immediately downstream decrease k(cat) values by a factor of 4 to 250, indicating that 9(25)-11t displays significant sequence specificity despite the lack of an apparent Watson-Crick base-pairing scheme for recognition.},
	keywords = {CATIONS, CLEAVING DNA ENZYME, CYTOSOLIC FREE MAGNESIUM, HAIRPIN RIBOZYME CLEAVAGE, HAMMERHEAD, IMIDAZOLYL FUNCTIONALITIES, IN-VITRO SELECTION, MONOVALENT, NUCLEIC-ACIDS, NUCLEOSIDE TRIPHOSPHATES, SEQUENCE-SPECIFIC CLEAVAGE},
	isbn = {0305-1048},
	url = {<Go to ISI>://000226309400036},
	author = {Ting, R. and Thomas, J. M. and Lermer, L. and Perrin,David M.}
}
@article {771,
	title = {Predominantly sigma-bonded metal carbonyl cations (sigma-carbonyls): New synthetic, structural, and bonding concepts in metal carbonyl chemistry},
	journal = {Chemistry-a European Journal},
	volume = {9},
	number = {8},
	year = {2003},
	note = {ISI Document Delivery No.: 669ZKTimes Cited: 7Cited Reference Count: 60},
	month = {Apr},
	pages = {1668-1676},
	type = {Article},
	abstract = {Predominantly sigma-bonded metal carbonyl cations (sigma-carbonyls) are conveniently generated in the Lewis superacid SbF5 or the conjugate Bronsted-Lewis superacid HF-SbF5, primarily by solvolytic or reductive carbonylations. Thermally stable salts are formed with the fluoroantimonate(v) ions [SbF6](-) and [Sb2F11](-). The salts are characterised by analytical, structural, spectroscopic and computational methods. Most homoleptic carbonyl cations have very regular geometries, comensurate with their d-electron configurations: linear (d(10)), square planar (d(8)) or octahedral(d(6)). The cations with metals in oxidation states of +2 or +3 are termed "superelectrophilic". Extended molecular structures form by significant interionic C-F contacts with electrophilic carbon as acceptor. To account for all experimental observations, a conceptually simple synergetic bonding model is proposed. An outlook at anticipated future developments based on very recent results is provided.},
	keywords = {<PT(CO)(4)><SB2F11>(2), carbonyl ligands, CATIONS, COMPLEXES, CRYSTAL, fluoro antimonates, FLUOROSULFATE, MOLECULAR-STRUCTURE, MONOXIDE, solid-state structures, superacidic systems, UNDECAFLUORODIANTIMONATE(V), VIBRATIONAL-SPECTRA, WEAKLY COORDINATING ANIONS, X-RAY-DIFFRACTION},
	isbn = {0947-6539},
	url = {<Go to ISI>://000182381600002},
	author = {Willner, H. and Aubke, F.}
}
@article {502,
	title = {Experimental and calculated molecular structures and high symmetry conformations of [Sb2F11](-) (D-4h) and 1,4-C4H4N2 center dot 2SbF(5) (D-2h)},
	journal = {Solid State Sciences},
	volume = {4},
	number = {11-12},
	year = {2002},
	note = {ISI Document Delivery No.: 634TJTimes Cited: 8Cited Reference Count: 52},
	month = {Nov-Dec},
	pages = {1457-1463},
	type = {Article},
	abstract = {Antimony(V) fluoride, SbF5, forms a molecular adduct with pyrazine (1,4-diazine) of the composition 1,4-C4H4N2.2SbF5. Its molecular structure is obtained by single crystal X-ray diffraction. Crystal data of pyrazine.2SbF(5): orthorhombic, spacegroup Pbca ($\#$ 61); a = 8.8052(8) Angstrom; b = 9.948(1) Angstrom; c = 12.297(2) Angstrom; V = 1077.1(2) Angstrom(3); Z = 4; T = 173(1) K; R-1(I > 3sigma (I)) = 0.031; wR(2) = 0.083. The Sb-F-4(eq) planes are eclipsed and the planar C4H4N2 ring is at a 45degrees angle to give D-2h symmetry for pyrazine.2SbF(5). A very similar high symmetry conformation of pointgroup D-4h is found for the [Sb2F11](-) anion in the metal carbonyl salts [Rh(CO)(4)][Sb2F11], [Au(CO)(2)][Sb2F11] and in [H3F2][Sb2F11]. Structural data for pyrazine.2SbF(5) and [Sb2F11](-) from [H3F2][Sb2F11], as well as vibrational data for [Sb2F11](-) (D-4h) are compared to calculated (DFT-B3LYP) data. According to the DFT calculations, the conformation for the[Sb2F11](-) anion (D-4h) and pyrazine.2SbF(5) (D-2h) are both eclipsed with respect to the SbF5-groups and eclipsed with respect to the pyrazine plane in pyrazine.2SbF(5) in their respective ground states. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.},
	keywords = {ADDUCTS, antimony(V) fluoride, CATIONS, CRYSTAL, F-19, fluoroantimonate anion, HEXACARBONYLS, high symmetry conformation, Lewis acid-base adducts, N-donor complex of antimony(V) fluoride, superacid anion, UNDECAFLUORODIANTIMONATE(V), VIBRATIONAL-SPECTRA},
	isbn = {1293-2558},
	url = {<Go to ISI>://000180356800016},
	author = {Sham, I. H. T. and Patrick, B. O. and von Ahsen, B. and von Ahsen, S. and Willner, H. and Thompson, R. C. and Aubke, F.}
}
@article {502,
	title = {Experimental and calculated molecular structures and high symmetry conformations of [Sb2F11](-) (D-4h) and 1,4-C4H4N2 center dot 2SbF(5) (D-2h)},
	journal = {Solid State Sciences},
	volume = {4},
	number = {11-12},
	year = {2002},
	note = {ISI Document Delivery No.: 634TJTimes Cited: 8Cited Reference Count: 52},
	month = {Nov-Dec},
	pages = {1457-1463},
	type = {Article},
	abstract = {Antimony(V) fluoride, SbF5, forms a molecular adduct with pyrazine (1,4-diazine) of the composition 1,4-C4H4N2.2SbF5. Its molecular structure is obtained by single crystal X-ray diffraction. Crystal data of pyrazine.2SbF(5): orthorhombic, spacegroup Pbca ($\#$ 61); a = 8.8052(8) Angstrom; b = 9.948(1) Angstrom; c = 12.297(2) Angstrom; V = 1077.1(2) Angstrom(3); Z = 4; T = 173(1) K; R-1(I > 3sigma (I)) = 0.031; wR(2) = 0.083. The Sb-F-4(eq) planes are eclipsed and the planar C4H4N2 ring is at a 45degrees angle to give D-2h symmetry for pyrazine.2SbF(5). A very similar high symmetry conformation of pointgroup D-4h is found for the [Sb2F11](-) anion in the metal carbonyl salts [Rh(CO)(4)][Sb2F11], [Au(CO)(2)][Sb2F11] and in [H3F2][Sb2F11]. Structural data for pyrazine.2SbF(5) and [Sb2F11](-) from [H3F2][Sb2F11], as well as vibrational data for [Sb2F11](-) (D-4h) are compared to calculated (DFT-B3LYP) data. According to the DFT calculations, the conformation for the[Sb2F11](-) anion (D-4h) and pyrazine.2SbF(5) (D-2h) are both eclipsed with respect to the SbF5-groups and eclipsed with respect to the pyrazine plane in pyrazine.2SbF(5) in their respective ground states. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.},
	keywords = {ADDUCTS, antimony(V) fluoride, CATIONS, CRYSTAL, F-19, fluoroantimonate anion, HEXACARBONYLS, high symmetry conformation, Lewis acid-base adducts, N-donor complex of antimony(V) fluoride, superacid anion, UNDECAFLUORODIANTIMONATE(V), VIBRATIONAL-SPECTRA},
	isbn = {1293-2558},
	url = {<Go to ISI>://000180356800016},
	author = {Sham, I. H. T. and Patrick, B. O. and von Ahsen, B. and von Ahsen, S. and Willner, H. and Thompson, R. C. and Aubke, F.}
}
@article {430,
	title = {Toward an RNaseA mimic: a DNAzyme with imidazoles and cationic amines},
	journal = {Journal of the American Chemical Society},
	volume = {124},
	number = {34},
	year = {2002},
	note = {ISI Document Delivery No.: 586GJTimes Cited: 41Cited Reference Count: 52},
	month = {Aug},
	pages = {9960-9961},
	type = {Article},
	keywords = {CATALYTIC REPERTOIRE, CATIONS, CLEAVING DNA ENZYME, FUNCTIONALITIES, HAMMERHEAD, IN-VITRO SELECTION, MONOVALENT, NUCLEIC-ACIDS, RIBOZYME, SEQUENCE-SPECIFIC CLEAVAGE, SITE-SPECIFIC CLEAVAGE},
	isbn = {0002-7863},
	url = {<Go to ISI>://000177576000001},
	author = {Lermer, L. and Roupioz, Y. and Ting, R. and Perrin,David M.}
}
@article {5125,
	title = {Synthesis, characterization, and properties of some cyclopentadienyl molybdenum nitrosyl benzyl complexes},
	journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie},
	volume = {79},
	number = {5-6},
	year = {2001},
	note = {ISI Document Delivery No.: 456EVTimes Cited: 2Cited Reference Count: 46},
	month = {May},
	pages = {502-509},
	type = {Article},
	abstract = {Reaction of CpMo(NO)(CH2Ph)Cl with Me2Mg, Ph2Mg, or PhCCLi reagents in THF affords the corresponding alkyl, aryl, or alkynyl CpMo(NO)(CH2Ph)R (R = hydrocarbyl) complexes as orange powders in good yields. Unlike related 16-electron CpMo(NO)R-2 complexes, these 18-electron species exhibit good thermal stability due to their eta (2)-benzyl-Mo interactions. Treatment of CpMo(NO)(CH2Ph)Cl with Na(DME)Cp provides dark green Cp2Mo(NO)(CH2Ph), whose solid-state molecular structure has been established by a single-crystal X-ray crystallographic analysis. The two Cp rings display different binding modes to the Mo atom, while the benzyl ligand is coordinated to the metal centre in an eta (1) fashion. The triflate complex, CpMo(NO)(CH2Ph)(OTf), is obtained by addition of AgOTf to the benzyl chloride precursor. The covalent Mo-OTf bond in this compound can be disrupted by the addition of Lewis bases (L) such as PPh3 or pyridine, leading to the corresponding [CpMo(NO)(CH2Ph)(L)][OTf] salts. Attempts to generate neutral benzylidene complexes by deprotonation of [CpMo(NO)(CH2Ph)(PPh3)][OTf] have not yet been successful.},
	keywords = {BENZYL, CATIONS, CRYSTAL-STRUCTURES, GROUP-6 METALS, hydrocarbyl, LIGANDS, {ALKYLIDENE COMPLEX},
	isbn = {0008-4042},
	url = {<Go to ISI>://000170070900006},
	author = {Legzdins,Peter and Smith, K. M. and Rettig, S. J.}
}
@article {4914,
	title = {Polybis(4-azabenzimidazolato)-iron(II) and -cobalt(II). 3-D single diamond-like framework materials which exhibit spin canting and ferromagnetic ordering at low temperatures},
	journal = {Journal of the Chemical Society-Dalton Transactions},
	number = {21},
	year = {2000},
	note = {ISI Document Delivery No.: 374EATimes Cited: 31Cited Reference Count: 48},
	pages = {3931-3937},
	type = {Article},
	abstract = {{The direct reaction between ferrocene and an excess of molten 4-azabenzimidazole yielded amber-green crystals of polybis(4-azabenzimidazolato)iron(II), 1. Single crystal X-ray diffraction studies revealed tetrahedrally coordinated iron ions linked by single imidazolate bridges and forming a 3-D single diamond-like (diamondoid) extended lattice. Magnetization studies show the effects of antiferromagnetic exchange above a critical temperature},
	keywords = {CATIONS, COMPLEXES, CONSTRUCTION, coordination polymers, COPPER(I), CRYSTAL-STRUCTURES, LIGANDS, MAGNETIC-PROPERTIES, METAL PYRAZOLATE POLYMERS, NET},
	isbn = {1470-479X},
	url = {<Go to ISI>://000165330400026},
	author = {Rettig, S. J. and Sanchez, V. and Storr, A. and Thompson, R. C. and Trotter, J.}
}
@article {4914,
	title = {Polybis(4-azabenzimidazolato)-iron(II) and -cobalt(II). 3-D single diamond-like framework materials which exhibit spin canting and ferromagnetic ordering at low temperatures},
	journal = {Journal of the Chemical Society-Dalton Transactions},
	number = {21},
	year = {2000},
	note = {ISI Document Delivery No.: 374EATimes Cited: 31Cited Reference Count: 48},
	pages = {3931-3937},
	type = {Article},
	abstract = {{The direct reaction between ferrocene and an excess of molten 4-azabenzimidazole yielded amber-green crystals of polybis(4-azabenzimidazolato)iron(II), 1. Single crystal X-ray diffraction studies revealed tetrahedrally coordinated iron ions linked by single imidazolate bridges and forming a 3-D single diamond-like (diamondoid) extended lattice. Magnetization studies show the effects of antiferromagnetic exchange above a critical temperature},
	keywords = {CATIONS, COMPLEXES, CONSTRUCTION, coordination polymers, COPPER(I), CRYSTAL-STRUCTURES, LIGANDS, MAGNETIC-PROPERTIES, METAL PYRAZOLATE POLYMERS, NET},
	isbn = {1470-479X},
	url = {<Go to ISI>://000165330400026},
	author = {Rettig, S. J. and Sanchez, V. and Storr, A. and Thompson, R. C. and Trotter, J.}
}
@article {4914,
	title = {Polybis(4-azabenzimidazolato)-iron(II) and -cobalt(II). 3-D single diamond-like framework materials which exhibit spin canting and ferromagnetic ordering at low temperatures},
	journal = {Journal of the Chemical Society-Dalton Transactions},
	number = {21},
	year = {2000},
	note = {ISI Document Delivery No.: 374EATimes Cited: 31Cited Reference Count: 48},
	pages = {3931-3937},
	type = {Article},
	abstract = {{The direct reaction between ferrocene and an excess of molten 4-azabenzimidazole yielded amber-green crystals of polybis(4-azabenzimidazolato)iron(II), 1. Single crystal X-ray diffraction studies revealed tetrahedrally coordinated iron ions linked by single imidazolate bridges and forming a 3-D single diamond-like (diamondoid) extended lattice. Magnetization studies show the effects of antiferromagnetic exchange above a critical temperature},
	keywords = {CATIONS, COMPLEXES, CONSTRUCTION, coordination polymers, COPPER(I), CRYSTAL-STRUCTURES, LIGANDS, MAGNETIC-PROPERTIES, METAL PYRAZOLATE POLYMERS, NET},
	isbn = {1470-479X},
	url = {<Go to ISI>://000165330400026},
	author = {Rettig, S. J. and Sanchez, V. and Storr, A. and Thompson, R. C. and Trotter, J.}
}
@article {4730,
	title = {The tetrakis(carbonyl)dioxoosmium(VI) cation: trans-[OsO2(CO)(4)](2+)},
	journal = {Angewandte Chemie-International Edition},
	volume = {39},
	number = {1},
	year = {2000},
	note = {ISI Document Delivery No.: 273GWTimes Cited: 5Cited Reference Count: 34},
	pages = {168-+},
	type = {Article},
	keywords = {C-13, carbonyl complexes, CATIONS, COMPLEXES, CRYSTAL-STRUCTURE, density functional calculations, MAS-NMR-SPECTRA, MOLECULAR-STRUCTURE, superacidic systems, UNDECAFLUORODIANTIMONATE(V), vibrational spectroscopy},
	isbn = {1433-7851},
	url = {<Go to ISI>://000084700400017},
	author = {Bernhardt, E. and Willner, H. and Jonas, V. and Thiel, W. and Aubke, F.}
}
@article {4474,
	title = {The carbonyl chlorine(I) cation [ClCO](+)},
	journal = {Angewandte Chemie-International Edition},
	volume = {38},
	number = {6},
	year = {1999},
	note = {ISI Document Delivery No.: 177VXTimes Cited: 11Cited Reference Count: 28},
	pages = {823-825},
	type = {Article},
	keywords = {CATIONS, GAS-PHASE, INFRARED-SPECTRUM, IR spectroscopy, OCS, Raman spectroscopy, SPECTROSCOPIC CHARACTERIZATION, SUPERACID SYSTEMS},
	isbn = {1433-7851},
	url = {<Go to ISI>://000079232700020},
	author = {Bernhardt, E. and Willner, H. and Aubke, F.}
}
@article {4159,
	title = {Homoleptic metal carbonyl cations of the electron-rich metals: Their generation in superacid media together with their spectroscopic and structural characterization},
	journal = {Angewandte Chemie-International Edition in English},
	volume = {36},
	number = {22},
	year = {1997},
	note = {ISI Document Delivery No.: YK253Times Cited: 18Cited Reference Count: 279},
	month = {Dec},
	pages = {2403-2425},
	type = {Review},
	keywords = {ANIONS, carbonyl complexes, CATIONS, CESIUM, FLUOROSULFATE, FLUOROSULFATE DERIVATIVES, GOLD(III), HEXAKIS(FLUOROSULFATO)ANTIMONATE(V), HIGHLY REDUCED ORGANOMETALLICS, MAS-NMR-SPECTRA, MOLECULAR-STRUCTURE, superacidic systems, synthetic methods, transition metals, TRANSITION-ELEMENTS, TRIFLUOROMETHYLATED, TRIS(PYRAZOLYL)BORATE, VIBRATIONAL-SPECTRA, WEAKLY COORDINATING},
	isbn = {0570-0833},
	url = {<Go to ISI>://A1997YK25300001},
	author = {Willner, H. and Aubke, F.}
}
@article {3759,
	title = {Extended chain 2,3-pyrazinedicarboxylase complexes of manganese(II) and cadmium(II); Synthesis and structure and magnetic properties},
	journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie},
	volume = {74},
	number = {12},
	year = {1996},
	note = {ISI Document Delivery No.: WG452Times Cited: 26Cited Reference Count: 16},
	month = {Dec},
	pages = {2413-2423},
	type = {Article},
	abstract = {{Manganese and cadmium complexes of singly and doubly deprotonated 2,3-pyrazinedicarboxylic acid (pyzdcH(2)) have been prepared and studied. Crystal data: [H3O](2x)[Mn(pyzdc)(2)](x), 1, monoclinic, C2/(c) (no. 15)},
	keywords = {2, 3-pyrazinedicarboxylates, ANTIFERROMAGNETISM, CADMIUM, CATIONS, EXCHANGE, extended chains, LIGANDS, manganese, structures, X-RAY},
	isbn = {0008-4042},
	url = {<Go to ISI>://A1996WG45200003},
	author = {Mao, L. and Rettig, S. J. and Thompson, W. C. and Trotter, J. and Xia, S. H.}
}
@article {3842,
	title = {Solvolysis reactions in liquid antimony (V) fluoride. A convenient and versatile synthetic method},
	journal = {European Journal of Solid State and Inorganic Chemistry},
	volume = {33},
	number = {9},
	year = {1996},
	note = {ISI Document Delivery No.: VK527Times Cited: 9Cited Reference Count: 71},
	pages = {917-930},
	type = {Article},
	abstract = {{Solvolysis reactions of various fluorosulfates in liquid antimony (V) fluoride allow the synthesis of a wide range of fluoroantimonate (V) salts with main group, organometallic and transition metal cations. In the presence of carbon monoxide, CO, at pressures of 0.5 to 2.0 atmospheres a new group of homoleptic carbonyl cations of electronrich metals (Hg, Au, Pt, Pd, Ir, Ru, and Os) form with [Sb2F11](-) as anion. The salts show relatively high thermal stability (> 100 degrees C). The geometries of the cations [Au(CO)(2)](+), [Hg(CO)(2)](2+) (linear) and [M(CO)(4)](2+)},
	keywords = {CATIONS, CRYSTAL, FLUOROSULFATES, MAGNETIC-PROPERTIES, MAS NMR-SPECTRA, MOLECULAR-STRUCTURE, NOBLE-METALS, TRIS(FLUOROSULFATE), UNDECAFLUORODIANTIMONATE(V), VIBRATIONAL-SPECTRA},
	isbn = {0992-4361},
	url = {<Go to ISI>://A1996VK52700012},
	author = {Wang, C. and Hwang, G. and Siu, S. C. and Aubke, F. and Bley, B. and Bodenbinder, M. and Bach, C. and Willner, H.}
}
@article {3866,
	title = {Superacid anions: Crystal and molecular structures of oxonium undecafluorodiantimonate(V), [H3O][Sb2F11], cesium fluorosulfate, CsSO3F, cesium hydrogen bis(fluorosulfate), Cs[H(SO3F)(2)], cesium tetrakis(fluorosulfato)aurate(III), Cs[Au(SO3F)(4)], cesium},
	journal = {Inorganic Chemistry},
	volume = {35},
	number = {21},
	year = {1996},
	note = {ISI Document Delivery No.: VL611Times Cited: 31Cited Reference Count: 90},
	month = {Oct},
	pages = {6113-6130},
	type = {Article},
	abstract = {{In order to understand the reasons for the low nucleophilicity of superacid anions, a systematic, comparative study of six superacid anions by single-crystal X-ray diffraction is undertaken. From magic acid, HSO3F-SbF5, surprisingly, single crystals of oxonium undecafluorodiantimonate(V), [H3O][Sb2F11], 1, are obtained. In the remaining five salts the cesium ion, Cs+, is used as the countercation. Both CsSO3F, 2, and its solvate Cs[H(SO3F)(2)], 3, are derived from the Bronsted superacid HSO3F. The conjugate noble metal superacid systems HSO3F-Au(SO3F)(3) and HSO3F-Pt(SO3F)(4) provide cesium tetrakis(fluorosulfato)aurate(III) Cs[Au(SO3F)(4)], 4, and cesium hexakis (fluorosulfato)platinate(IV) Cs-2[Pt(SO3F)(6)], 5. Cesium hexakis (fluorosulfato)antimonate(V) Cs[Sb(SO3F)(6)], 6, whose synthesis is described here in detail, provides evidence for the possible existence of a new conjugate superacid system, HSO3F-Sb(SO3F)(5). Crystals of [H3O][Sb2F11] (1, H3F11OSb2) are orthorhombic},
	keywords = {ACIDS, BEHAVIOR, CATIONS, CONSTANTS, DERIVATIVES, FLUORIDE, FLUOROSULFATE, GOLD(III), TRIS(FLUOROSULFATE), VIBRATIONAL-SPECTRA, WEAKLY COORDINATING ANIONS},
	isbn = {0020-1669},
	url = {<Go to ISI>://A1996VL61100024},
	author = {Zhang, D. L. and Rettig, S. J. and Trotter, J. and Aubke, F.}
}
@article {3866,
	title = {Superacid anions: Crystal and molecular structures of oxonium undecafluorodiantimonate(V), [H3O][Sb2F11], cesium fluorosulfate, CsSO3F, cesium hydrogen bis(fluorosulfate), Cs[H(SO3F)(2)], cesium tetrakis(fluorosulfato)aurate(III), Cs[Au(SO3F)(4)], cesium},
	journal = {Inorganic Chemistry},
	volume = {35},
	number = {21},
	year = {1996},
	note = {ISI Document Delivery No.: VL611Times Cited: 31Cited Reference Count: 90},
	month = {Oct},
	pages = {6113-6130},
	type = {Article},
	abstract = {{In order to understand the reasons for the low nucleophilicity of superacid anions, a systematic, comparative study of six superacid anions by single-crystal X-ray diffraction is undertaken. From magic acid, HSO3F-SbF5, surprisingly, single crystals of oxonium undecafluorodiantimonate(V), [H3O][Sb2F11], 1, are obtained. In the remaining five salts the cesium ion, Cs+, is used as the countercation. Both CsSO3F, 2, and its solvate Cs[H(SO3F)(2)], 3, are derived from the Bronsted superacid HSO3F. The conjugate noble metal superacid systems HSO3F-Au(SO3F)(3) and HSO3F-Pt(SO3F)(4) provide cesium tetrakis(fluorosulfato)aurate(III) Cs[Au(SO3F)(4)], 4, and cesium hexakis (fluorosulfato)platinate(IV) Cs-2[Pt(SO3F)(6)], 5. Cesium hexakis (fluorosulfato)antimonate(V) Cs[Sb(SO3F)(6)], 6, whose synthesis is described here in detail, provides evidence for the possible existence of a new conjugate superacid system, HSO3F-Sb(SO3F)(5). Crystals of [H3O][Sb2F11] (1, H3F11OSb2) are orthorhombic},
	keywords = {ACIDS, BEHAVIOR, CATIONS, CONSTANTS, DERIVATIVES, FLUORIDE, FLUOROSULFATE, GOLD(III), TRIS(FLUOROSULFATE), VIBRATIONAL-SPECTRA, WEAKLY COORDINATING ANIONS},
	isbn = {0020-1669},
	url = {<Go to ISI>://A1996VL61100024},
	author = {Zhang, D. L. and Rettig, S. J. and Trotter, J. and Aubke, F.}
}
@article {3611,
	title = {Syntheses and vibrational and C-13 MAS-NMR spectra of bis(carbonyl)mercury(II) undecafluorodiantimonate(V) ([Hg(CO)(2)][Sb2F11](2)) and of bis(carbonyl) dimercury(I) undecafluorodiantimonate ([Hg-2(CO)(2)][Sb2F11](2)) and the molecular structure of [Hg(CO},
	journal = {Inorganic Chemistry},
	volume = {35},
	number = {1},
	year = {1996},
	note = {ISI Document Delivery No.: TP072Times Cited: 53Cited Reference Count: 96},
	month = {Jan},
	pages = {82-92},
	type = {Article},
	abstract = {The synthesis of bis(carbonyl)mercury(II) undecafluorodiantimonate(V), [Hg(CO)(2)][Sb2F11](2), and that of the corresponding mercury(I) salt [Hg-2(CO)(2)][Sb2F11](2) are accomplished by the solvolyses of Hg(SO3F)(2) or of Hg2F2, treated with fluorosulfuric acid, HSO3F, in liquid antimony(V) fluoride at 80 or 60 degrees C, respectively, in an atmosphere of CO (500-800 mbar). The resulting white solids are the first examples of metal carbonyl derivatives formed by a post-transition element. Both salts are characterized by FT-IR, FT-Raman, and C-13-MAS-NMR spectroscopy. For [Hg(CO)(2)][Sb2F11], unprecedentedly high CO stretching frequencies (<(nu)over bar>(av) = 2279.5 cm(-1)) and stretching force constant (f(r) = 21.0 +/- 0.1) x 10(2) Nm(-1)) are obtained. Equally unprecedented is the (1)J(C-13-Hg-199) value of 5219 +/- 5 Hz observed in the C-13 MAS-NMR spectrum of the C-13 labeled isotopomers at delta = 168.8 +/- 0.1 ppm. The corresponding values (<(nu)over bar>(av) = 2247 cm(-1), f(r) = (20.4 +/- 0.1) x 10(2) Nm(-1), (1)J(C-13-Hg-199) = 3350 +/- 50 Hz and (2)J(C-13-Hg-199) 850 +/- 50 Hz) are found for [Hg-2(CO)(2)][Sb2F11](2), which has lower thermal stability (decomposition point in a sealed tube is 140 degrees C vs 160 degrees C for the Hg(II) compound) and a decomposition pressure of 8 Torr at 20 degrees C. The mercury(I) salt is sensitive toward oxidation to [Hg(CO)(2)][Sb2F11](2) during synthesis. Both linear cations (point group D infinity h) are excellent examples of nonclassical (sigma-only) metal-CO bonding. Crystal data for [Hg(CO)(2)][Sb2F11](2): monoclinic, space group P2(1)/n; Z = 2; a = 7.607(2) Angstrom; b = 14.001(3) Angstrom; c = 9.730(2) Angstrom; beta = 111.05(2)degrees; V = 957.1 Angstrom(3); T = 195 K; R(F) = 0.035 for 1983 data (I-0 greater than or equal to 2.5 sigma(I-0)) and 143 variables. The Hg atom lies on a crystallographic inversion center. The Hg-C-O angle is 177.7(7)degrees. The length of the mercury-carbon bond is 2.083(10) Angstrom and of the C-O bond 1.104(12) Angstrom respectively. The structure is stabilized in the solid state by a number of significant secondary interionic Hg{\textendash}-F and C{\textendash}-F contacts.},
	keywords = {ACIDS, BOND, CARBON-MONOXIDE, CATIONS, CONSTANTS, CRYSTAL-STRUCTURES},
	isbn = {0020-1669},
	url = {<Go to ISI>://A1996TP07200016},
	author = {Bodenbinder, M. and Balzerjollenbeck, G. and Willner, H. and Batchelor, R. J. and Einstein, F. W. B. and Wang, C. and Aubke, F.}
}
@article {3306,
	title = {SYNTHESIS, CHARACTERIZATION, AND PROPERTIES OF [CP-ASTERISK-M(NO)(ETA(2)-CH(2)PH)(NCME)]BF4 SALTS (M=MO, W) AND RELATED COMPLEXES - THE STABILIZING INFLUENCE OF BENZYL LIGANDS},
	journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie},
	volume = {73},
	number = {7},
	year = {1995},
	note = {ISI Document Delivery No.: RT503Times Cited: 6Cited Reference Count: 29},
	month = {Jul},
	pages = {1035-1043},
	type = {Article},
	abstract = {Treatment of orange solutions of Cp*M(NO)(eta(2)-CH(2)Ph)Cl (M = Mo or W) with an equimolar amount of solid AgBF4 in MeCN affords the salts [Cp*M(NO)(eta(2)-CH(2)Ph)(NCMe)]BF4 as analytically pure crystals in good yields. Both orange complexes have been subjected to single-crystal X-ray crystallographic analyses in order to establish their molecular geometries and their intramolecular metrical parameters. Both salts consist of discrete organometallic cations and tetrahedral BF4- anions, the intramolecular dimensions of the two cationic complexes being essentially the same and resembling those found for related Cp*M(NO)-containing compounds. The isolated [Cp*M(NO)(eta(2)-CH(2)Ph)(NCMe)](+) cations are quite electrophilic, being able to abstract Cl- from a NaCl IR cell to revert to their chloro precursors. However, treatment of the [Cp*W(NO)(eta(2)-CH(2)Ph)(NCMe)]BF4 salt with various unsaturated substrates (e.g., diphenylacetylene, 2,3-dimethyl-1,3-butadiene, carbon monoxide, and acetone) in CDCl3 results in no detectable chemical reaction. Lewis bases weaker than Cl- evidently cannot displace the acetonitrile ligand from the coordination sphere of the metal or induce the benzyl ligand to diminish its hapticity. Such a diminution does occur for the CH(2)Ph ligand when the MeCN group in the cationic complexes is replaced by a carboxylate anion to produce neutral Cp{\textquoteright}M(NO)(eta(1)-CH(2)Ph)(eta(2)-O(2)CR) complexes. The latter complexes are obtainable by treatment of Cp*M(NO)(eta(2)-CH(2)Ph)Cl with AgO(2)CR (R = CH(Et)(Ph)) in CH2Cl2 and have been fully characterized by conventional spectroscopic methods.},
	keywords = {ARYL, ASYMMETRIC COMPLEXES, BENZYL, CARBON-MONOXIDE, CATIONS, CP{\textquoteright}M(NO)R2, {ALKYL},
	isbn = {0008-4042},
	url = {<Go to ISI>://A1995RT50300017},
	author = {Dryden, N. H. and Legzdins,Peter and Sayers, S. F. and Trotter, J. and Yee, V. C.}
}
@article {3306,
	title = {SYNTHESIS, CHARACTERIZATION, AND PROPERTIES OF [CP-ASTERISK-M(NO)(ETA(2)-CH(2)PH)(NCME)]BF4 SALTS (M=MO, W) AND RELATED COMPLEXES - THE STABILIZING INFLUENCE OF BENZYL LIGANDS},
	journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie},
	volume = {73},
	number = {7},
	year = {1995},
	note = {ISI Document Delivery No.: RT503Times Cited: 6Cited Reference Count: 29},
	month = {Jul},
	pages = {1035-1043},
	type = {Article},
	abstract = {Treatment of orange solutions of Cp*M(NO)(eta(2)-CH(2)Ph)Cl (M = Mo or W) with an equimolar amount of solid AgBF4 in MeCN affords the salts [Cp*M(NO)(eta(2)-CH(2)Ph)(NCMe)]BF4 as analytically pure crystals in good yields. Both orange complexes have been subjected to single-crystal X-ray crystallographic analyses in order to establish their molecular geometries and their intramolecular metrical parameters. Both salts consist of discrete organometallic cations and tetrahedral BF4- anions, the intramolecular dimensions of the two cationic complexes being essentially the same and resembling those found for related Cp*M(NO)-containing compounds. The isolated [Cp*M(NO)(eta(2)-CH(2)Ph)(NCMe)](+) cations are quite electrophilic, being able to abstract Cl- from a NaCl IR cell to revert to their chloro precursors. However, treatment of the [Cp*W(NO)(eta(2)-CH(2)Ph)(NCMe)]BF4 salt with various unsaturated substrates (e.g., diphenylacetylene, 2,3-dimethyl-1,3-butadiene, carbon monoxide, and acetone) in CDCl3 results in no detectable chemical reaction. Lewis bases weaker than Cl- evidently cannot displace the acetonitrile ligand from the coordination sphere of the metal or induce the benzyl ligand to diminish its hapticity. Such a diminution does occur for the CH(2)Ph ligand when the MeCN group in the cationic complexes is replaced by a carboxylate anion to produce neutral Cp{\textquoteright}M(NO)(eta(1)-CH(2)Ph)(eta(2)-O(2)CR) complexes. The latter complexes are obtainable by treatment of Cp*M(NO)(eta(2)-CH(2)Ph)Cl with AgO(2)CR (R = CH(Et)(Ph)) in CH2Cl2 and have been fully characterized by conventional spectroscopic methods.},
	keywords = {ARYL, ASYMMETRIC COMPLEXES, BENZYL, CARBON-MONOXIDE, CATIONS, CP{\textquoteright}M(NO)R2, {ALKYL},
	isbn = {0008-4042},
	url = {<Go to ISI>://A1995RT50300017},
	author = {Dryden, N. H. and Legzdins,Peter and Sayers, S. F. and Trotter, J. and Yee, V. C.}
}
@article {3255,
	title = {THE USE OF FLUOROSULFURIC ACID, MAGIC ACID AND LIQUID ANTIMONY(V) FLUORIDE AS MEDIA TO GENERATE, STABILIZE AND STUDY METAL-CARBONYL CATIONS},
	journal = {Journal of Fluorine Chemistry},
	volume = {71},
	number = {2},
	year = {1995},
	note = {ISI Document Delivery No.: QV343Times Cited: 0Cited Reference Count: 11George H Cady Symposium on Inorganic Chemistry, at the 207th Meeting of the American-Chemical-SocietyMAR 14-17, 1994SAN DIEGO, CAAMER CHEM SOC},
	month = {Apr},
	pages = {201-202},
	type = {Proceedings Paper},
	keywords = {antimony(V) fluoride, CATIONS, fluorosulfuric acid, IR spectroscopy, magic acid, METAL CARBONYL, NMR spectroscopy, SYNTHESIS, UNDECAFLUORODIANTIMONATE(V)},
	isbn = {0022-1139},
	url = {<Go to ISI>://A1995QV34300025},
	author = {Bodenbinder, M. and Willner, H. and Aubke, F.}
}
@article {2831,
	title = {SYNTHESIS AND CHARACTERIZATION OF TETRAKIS(CARBONYL)PLATINUM(II) HEXAKIS(FLUOROSULFATO)PLATINATE(IV), [PT(CO)4][PT(SO3F)6]},
	journal = {Inorganic Chemistry},
	volume = {32},
	number = {21},
	year = {1993},
	note = {ISI Document Delivery No.: MC686Times Cited: 36Cited Reference Count: 27},
	month = {Oct},
	pages = {4667-4669},
	type = {Note},
	keywords = {CATIONS, GOLD(III) FLUOROSULFATE, ION},
	isbn = {0020-1669},
	url = {<Go to ISI>://A1993MC68600036},
	author = {Hwang, G. and Bodenbinder, M. and Willner, H. and Aubke, F.}
}
@article {7258,
	title = {GENERATION OF AU2+ IONS IN THE SOLID-STATE OR IN FLUOROSULFURIC ACID-SOLUTION AND THEIR IDENTIFICATION BY ESR},
	journal = {Journal of the American Chemical Society},
	volume = {114},
	number = {4},
	year = {1992},
	note = {ISI Document Delivery No.: HD978Times Cited: 25Cited Reference Count: 64},
	month = {Feb},
	pages = {1271-1277},
	type = {Article},
	abstract = {{The partial pyrolysis of gold(III) fluorosulfate, Au(SO3F)3, at temperatures below 145-degrees-C allows the generation of Au2+ defects in the solid residue by reductive elimination of SO3F. radicals. Solvated Au2+ is obtained by the reduction of Au(SO3F)3 in HSO3F solution by gold powder at 65-degrees-C. Both systems are studied by ESR and identical high g(iso) values of g = 2.360 are found. Hyperfine splitting due to Au-197},
	keywords = {BR2+, bromine, CATIONS, COMPLEX, GOLD(III) FLUOROSULFATE, HSO3F, I2+, palladium, SILVER(II)},
	isbn = {0002-7863},
	url = {<Go to ISI>://A1992HD97800024},
	author = {Herring, F. G. and Hwang, G. and Lee, K. C. and Mistry, F. and Phillips, P. S. and Willner, H. and Aubke, F.}
}
@article {7148,
	title = {THE CRYSTAL AND MOLECULAR-STRUCTURE OF GOLD TRIS(FLUOROSULFATE)},
	journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie},
	volume = {69},
	number = {3},
	year = {1991},
	note = {ISI Document Delivery No.: FE808Times Cited: 18Cited Reference Count: 49},
	month = {Mar},
	pages = {391-396},
	type = {Article},
	abstract = {{Single crystals of gold(III) tris(fluorosulfate) are obtained by recrystallization from bis(fluorosulfuryl) peroxide, S2O6F2, under O2 pressure. The crystals of [Au(SO3F)3]2 are monoclinic},
	keywords = {CATIONS, CHEMISTRY, COMPLEXES, crystal structure, GOLD(III) FLUOROSULFATE, GOLD(III) TRIS(FLUOROSULFATE), HSO3F, ION, OXIDE, STABILITY},
	isbn = {0008-4042},
	url = {<Go to ISI>://A1991FE80800005},
	author = {Willner, H. and Rettig, S. J. and Trotter, J. and Aubke, F.}
}
@article {7148,
	title = {THE CRYSTAL AND MOLECULAR-STRUCTURE OF GOLD TRIS(FLUOROSULFATE)},
	journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie},
	volume = {69},
	number = {3},
	year = {1991},
	note = {ISI Document Delivery No.: FE808Times Cited: 18Cited Reference Count: 49},
	month = {Mar},
	pages = {391-396},
	type = {Article},
	abstract = {{Single crystals of gold(III) tris(fluorosulfate) are obtained by recrystallization from bis(fluorosulfuryl) peroxide, S2O6F2, under O2 pressure. The crystals of [Au(SO3F)3]2 are monoclinic},
	keywords = {CATIONS, CHEMISTRY, COMPLEXES, crystal structure, GOLD(III) FLUOROSULFATE, GOLD(III) TRIS(FLUOROSULFATE), HSO3F, ION, OXIDE, STABILITY},
	isbn = {0008-4042},
	url = {<Go to ISI>://A1991FE80800005},
	author = {Willner, H. and Rettig, S. J. and Trotter, J. and Aubke, F.}
}
