@article {5233,
	title = {Lanthanide chemistry with bis{[bis(carboxymethyl)amino]methyl}phosphinate: What does an extra phosphinate group do to EDTA?},
	journal = {Inorganic Chemistry},
	volume = {40},
	number = {15},
	year = {2001},
	note = {ISI Document Delivery No.: 452MHTimes Cited: 9Cited Reference Count: 34},
	month = {Jul},
	pages = {3734-3738},
	type = {Article},
	abstract = {H5XT (bis{[bis(carboxymethyl)amino]methyl}phosphinic acid) is an EDTA(4-)-like ligand containing an extra phosphinate group. [Co-II(XT)](3-), [Co-III(XT)](2-), and a series of [Ln(XT)](2-) complexes have been prepared. The phosphinate group is not coordinated in the Co complexes but is bound in the lanthanide complexes. Solid state and solution behaviors of Ln-XT species are consistent: both monoprotonated and nonprotonated species have been found. Protonation of the metal complex does not lead to dissociation of a carboxylate; rather, the proton distributes around the molecular ion. The pM values of Ln-XT are comparable to those of Ln-EDTA but are higher than those of Ln-TMDTA. The inclusion of a phosphinate eases the selectivity of an EDTA-type ligand for late lanthanides.},
	keywords = {ACID, AGENTS, AMINE PHENOL LIGANDS, ANTIBODY, COMPLEXES, CRYSTAL-STRUCTURES, DERIVATIVES, IONS},
	isbn = {0020-1669},
	url = {<Go to ISI>://000169861800011},
	author = {Xu, L. and Rettig, S. J. and Orvig, Chris}
}
@article {4927,
	title = {Homotrinuclear lanthanide(III) arrays: Assembly of and conversion from mononuclear and dinuclear units},
	journal = {Inorganic Chemistry},
	volume = {39},
	number = {3},
	year = {2000},
	note = {ISI Document Delivery No.: 283FQTimes Cited: 48Cited Reference Count: 54},
	month = {Feb},
	pages = {496-507},
	type = {Article},
	abstract = {The reactions of potentially hexadentate H(2)bbpen (N,N{\textquoteright}-bis(2-hydroxybenzyl)-N,N{\textquoteright}-bis(2-pyridylmethyl)ethylenediamine, H(2)L1), H-2(Cl)bbpen (N,N{\textquoteright}-bis(5-chloro-2-hydroxybenzyl)-N,N{\textquoteright}-bis(2-pyridylmethyl)ethylene-di amine. H(2)L2), and H-2(Br)bbpen (N,N{\textquoteright}-bis(5-bromo-2-hydroxybenzyl)-N,N{\textquoteright}-bis(2-pyridylmethyl)ethylenediam ine H(2)L3) with Ln(III) ions in the presence of a base in methanol resulted in three types of complexes: neutral mononuclear ([LnL(NO3)]), monocationic dinuclear ([Ln(2)Ln(2)(NO3)](+)), and monocationic trinuclear ([Ln(3)L(2)(X)(n)-(CH3OH)](+)) when X = bridging (CH3COO-) and bidentate ligands (NO3-, CH3COO-, ClO4-) and n is 4. The formation of a complex depends on the bose (hydroxide or acetate) and the size of the respective Ln(III) ion. All complexes were characterized by infrared spectroscopy, mass spectrometry, and elemental analyses; in some cases, X-ray diffraction studies were also performed. The structures of the neutral mononuclear [Yb(L1)(NO3)], dinuclear [Pr-2(L1)(2)(NO3)(H2O)]NO3.CH3OH and [Gd-2(L1)(2)(NO3)]NO3.CH3OH.3H(2)O, and trinuclear [Gd-3(L3)(2)(CH3- COO)(4)(CH3OH)]ClO4.5CH(3)OH and [Sm-3(L1)(2)(CH3COO)(2)(NO3)(2)(CH3OH)]NO3.CH3OH.3.65H(2)O were solved by X-ray crystallography. The [LnL(NO3)] or [Ln(2)L(2)(NO3)](+) complexes could be converted to [Ln(3)L(2)(X)(n)(CH3-OH)](+) complexes by the addition of 1 equiv of a Ln(III) salt and 2-3 equiv of sodium acetate in methanol. The trinuclear complexes were found to be the most stable of the three types, which was evident from the presence of the intact monocationic high molecular weight parent peaks ([Ln(3)L(2)(X)(n)](+)) in the mass spectra of all the trinuclear complexes and from the ease of conversion from the mononuclear or dinuclear to the trinuclear species. The incompatibility of the ligand denticity with the coordination requirements of the Ln(III) ions was proven to be a useful tool in the construction of multinuclear Ln(III) metal ion arrays.},
	keywords = {AMINE PHENOL LIGANDS, ANTIBODY, COORDINATION, CRYSTAL-STRUCTURE, GADOLINIUM, IONS, METAL-COMPLEXES, MOLECULAR-STRUCTURE, SAMARIUM(III), Schiff-base},
	isbn = {0020-1669},
	url = {<Go to ISI>://000085266100017},
	author = {Setyawati, I. A. and Liu, S. and Rettig, S. J. and Orvig, Chris}
}
@article {4336,
	title = {Tightening the hydrophobic belt: Effects of backbone and donor group variation on podand ligand complexes of the lanthanides},
	journal = {Inorganic Chemistry},
	volume = {37},
	number = {7},
	year = {1998},
	note = {ISI Document Delivery No.: ZG944Times Cited: 44Cited Reference Count: 53},
	month = {Apr},
	pages = {1637-1647},
	type = {Article},
	abstract = {{The N4O3 tripodal aminomethylene phosphinato ligand tris(4-phenylphosphinato-3-methyl-3-azabutyl)amine (H-3-ppma) forms mono- and bis(ligand) complexes with lanthanide(III) metal ions Ln when Ln = Sm-Lu. The formation constants of the Lu (log beta(1) = 1.79, log beta(2) = 4.40) and the Yb (log beta(1) = 2.25, log beta(2) = 4.42) complexes were determined at pH = 1.5 using an unusual P-31 NMR spectroscopic method. The molecular structure of the lutetium complex [Lu(H(3)ppma)(2)](NO3)(3) . 3H(2)O (C60H96LuN11O24P6) was solved by X-ray methods; it crystallizes in the trigonal space group R(3) over barc$, with a = 19.060(1) Angstrom},
	keywords = {AMINE PHENOL LIGANDS, BIOLOGICAL-SYSTEMS, CHEMISTRY, COORDINATION, DESIGN, HEPTADENTATE LIGANDS, METAL-IONS, NMR SHIFTS, NUCLEAR MAGNETIC-RESONANCE, STABILITY},
	isbn = {0020-1669},
	url = {<Go to ISI>://000073055700034},
	author = {Lowe, M. P. and Caravan, P. and Rettig, S. J. and Orvig, Chris}
}
@article {3925,
	title = {Selectivity among, and aggregation of, lanthanide ions},
	journal = {Journal of Alloys and Compounds},
	volume = {249},
	number = {1-2},
	year = {1997},
	note = {ISI Document Delivery No.: XC092Times Cited: 4Cited Reference Count: 1421st Rare Earth Research ConferenceJUL 07-12, 1996DULUTH, MNRare Earth Res Conf Inc, Univ Minnesota, USR Optonix Inc, Amer Chem Soc, Petr Res Fund, Arris Int Corp, Baotou Steel \& Rare Earth Co, US},
	month = {Mar},
	pages = {49-51},
	type = {Proceedings Paper},
	abstract = {Ligands that show selectivity towards, and aggregation of, lanthanides are of intrinsic interest in coordination chemistry. We have shown that Schiff base and amine phenolate ligands exhibit a variety of coordination modes in lanthanide(III) complexes, and that tren-(tris((2-amino)ethyl)amine)-based amine phenolates show selectivity towards later lanthanide(III) ions. By altering the nature of the amine phenolate ligand backbone the coordination mode of the ligand in solution can be easily controlled. Selectivity among lanthanide(III) ions can be controlled by substitution of the parent ligand donor atoms (phenolate oxygen) with donor atoms of a different type (e.g. phosphinate oxygen). By derivatizing the ligand to include more donor atoms and by stiffening the backbone, it is possible to control the aggregation of lanthanide(III) ions (enabling the formation of dimeric lanthanide complexes).},
	keywords = {aggregation of lanthanide ions, AMINE PHENOL LIGANDS, COMPLEXES, DESIGN, HEPTADENTATE LIGANDS, METAL-IONS, selectivity among lanthanide ions},
	isbn = {0925-8388},
	url = {<Go to ISI>://A1997XC09200010},
	author = {Caravan, P. and Lowe, M. P. and Read, P. W. and Rettig, S. J. and Yang, L. W. and Orvig, Chris}
}
@article {3750,
	title = {Highly symmetric group 13 metal-phosphinato complexes: Multinuclear NMR (Al-27, P-31, Ga-71) determination of stability constants at low pH},
	journal = {Journal of the American Chemical Society},
	volume = {118},
	number = {43},
	year = {1996},
	note = {ISI Document Delivery No.: VQ089Times Cited: 12Cited Reference Count: 56},
	month = {Oct},
	pages = {10446-10456},
	type = {Article},
	abstract = {{An N4O3 tripodal tren-based (aminomethylene)phosphinato ligand tris(4-(phenylphosphinato)-3-methyl-3-azabutyl)amine (H(3)ppma) has been synthesized, and its complexation properties with the group 13 metals Al, Ga. and In have been investigated. The molecular structure of the indium complex [In(H(3)ppma)(2)](NO3)(3) . 3H(2)O (C60H96InN11O24P6) has been solved by X-ray methods; the complex crystallizes in the trigonal space group R(3) over barc$, with a = 18.984(3) Angstrom},
	keywords = {ACID, AL(III), aluminum, AMINE PHENOL LIGANDS, AQUEOUS-SOLUTION, COMPLEXES, gallium, IONS, LANTHANIDE(III), NUCLEAR-MAGNETIC-RESONANCE, PHOSPHONODIPEPTIDES},
	isbn = {0002-7863},
	url = {<Go to ISI>://A1996VQ08900015},
	author = {Lowe, M. P. and Rettig, S. J. and Orvig, Chris}
}
@article {3574,
	title = {COMPLEXATION OF THE POTENTIALLY HEPTADENTATE LIGAND H(3)DHA(3)TREN WITH LANTHANIDES - ARCHITECTURE OF A [ND(NO3)(3)(H(3)DHA(3)TREN)](N) POLYMER WITH PROFUSE MODES OF NITRATE COORDINATION},
	journal = {Inorganic Chemistry},
	volume = {34},
	number = {19},
	year = {1995},
	note = {ISI Document Delivery No.: RV737Times Cited: 22Cited Reference Count: 19},
	month = {Sep},
	pages = {4921-4925},
	type = {Note},
	keywords = {AMINE PHENOL LIGANDS, CRYSTAL, MOLECULAR-STRUCTURES},
	isbn = {0020-1669},
	url = {<Go to ISI>://A1995RV73700030},
	author = {Yang, L. W. and Liu, S. and Rettig, S. J. and Orvig, Chris}
}
@article {3266,
	title = {POTENTIOMETRIC, CALORIMETRIC, AND SOLUTION NMR-STUDIES OF A TRIDENTATE LIGAND WHICH HAS A MARKED PREFERENCE FOR FORMATION OF BIS(LIGAND) VERSUS MONO(LIGAND) LANTHANIDE COMPLEXES AND WHICH EXHIBITS HIGH SELECTIVITY FOR HEAVIER LANTHANIDES},
	journal = {Journal of the American Chemical Society},
	volume = {117},
	number = {45},
	year = {1995},
	note = {ISI Document Delivery No.: TE739Times Cited: 69Cited Reference Count: 59},
	month = {Nov},
	pages = {11230-11238},
	type = {Article},
	abstract = {A new water-soluble N4O3 tripodal amine phenol ligand, tris(((2-hydroxy-5-sulfobenzyl)amino)ethyl)amine (H(3)TRNS) has been synthesized, and its complexation properties with six lanthanide(III) ions (Ln, Nd, Gd, Ho, Yb, Lu) have been probed. In water, the ligand coordinates in a tridentate fashion through the three phenolate oxygen atoms to give mono- and bis(ligand) complexes. The bis complexes are proposed to be 7-coordinate containing one bound water as evinced by O-17 NMR experiments on the Dy3+ complex. while the mono complexes are proposed to have a coordination number of eight or nine. The stepwise formation constants for the 1:1 and 2:1 (L:M) complexes have been measured at 25 degrees C (mu = 0.16 M NaCl) for Nd3+ (log K-1 = 6.41, log K-2 6.34), Gd3+ (log K-1 = 6.67, log K-2 = 7.69), Ho3+ (log K-1 = 7.67, log K-2 = 8.75), and Yb3+ (log K-1 = 8.53, log K-2 = 9.73). The formation constants show an increasing affinity and an unprecedented selectivity for the heavier lanthanides (beta(2(yb)) - beta(2(Nd)) = 10(5.5)). Furthermore, the stepwise stability constant for the 2:1 complex is increasingly greater than that for the 1:1 complexes of Gd3+, Ho3+, and Yb3+, while K-1 and K-2 for the 1:1 and 2:1 complexes of Nd3+ are approximately the same. Solution calorimetry shows that the selectivity for the heavier lanthanides is an enthalpic effect (Delta H-beta 2 = -45.11 (Yb) and -13.71 kJ . mol(-1) (Nd)), while the anomalous behavior in formation constants (K-2 > K-1) is predominantly entropic (Delta S-2 > Delta S-1) and is rationalized in terms of salvation of the complexes, Lanthanum(III) forms only the 1:1 complex (log K = 5.65) which precipitates from solution.},
	keywords = {AGENTS, AMINE PHENOL LIGANDS, AQUEOUS, BIOLOGICAL-SYSTEMS, CHEMISTRY, EXCHANGE, HEPTADENTATE LIGANDS, METAL-IONS, NUCLEAR MAGNETIC-RESONANCE, probes, SHIFT-REAGENTS, WATER},
	isbn = {0002-7863},
	url = {<Go to ISI>://A1995TE73900021},
	author = {Caravan, P. and Hedlund, T. and Liu, S. and Sjoberg, S. and Orvig, Chris}
}
@article {3435,
	title = {Rhenium and technetium complexes from pentadentate (N3O2) and tetradentate (N2O2) Schiff base ligands},
	journal = {Canadian Journal of Chemistry-Revue Canadienne De Chimie},
	volume = {73},
	number = {12},
	year = {1995},
	note = {ISI Document Delivery No.: TV232Times Cited: 16Cited Reference Count: 32},
	month = {Dec},
	pages = {2272-2281},
	type = {Article},
	abstract = {{The rhenium(V) and technetium(V) complexes: [ReO(apa)], [{ReO(epa)}O-2], and [TcOCl(epa)] have been prepared from a potentially pentadentate N3O2 ligand, N,N{\textquoteright}-3-azapentane-1,5-diylbis(3-(1-iminoethyl)-6-methyl-2H-pyran-2,4(3H) -dione) (H(3)apa), or a potentially tetradentate N2O2 ligand, N,N{\textquoteright}-ethylene-diylbis(3-(1-iminoethyl)-6-methyl-2H-pyran-2,4 (3H)-dione) (H(2)epa). The N2O2 complexes were synthesized in low yields. There was also evidence indicating that H(2)ppa, N,H{\textquoteright}-propylene-diylbis(3-(1-iminoethyl)-6-methyl-2H-pyran- 2,4(3H)-dione), hydrolyzed in the course of coordination, forms a rhenium complex of the bidentate monoprotic (O,O) dehydroacetate (dha(-)), [Re(dha)Cl-2(OPPh(3))(PPh(3))]. EtOH. The structure of this complex was determined by X-ray crystallography. Crystals of [Re(dha)Cl-2(OPPh(3))(PPh(3))]. EtOH (C44H37Cl2O5P2Re . C2H6O) are monoclinic},
	keywords = {AMINE PHENOL LIGANDS, ATOM TRANSFER-REACTIONS, CRYSTAL-STRUCTURES, dehydroacetic acetate based Schiff base ligands, N2O2 Schiff base, N3O2 Schiff base, OXO-COMPLEXES, oxygen transfer, rhenium, technetium, X-ray structures},
	isbn = {0008-4042},
	url = {<Go to ISI>://A1995TV23200022},
	author = {Luo, H. Y. and Liu, S. and Rettig, S. J. and Orvig, Chris}
}
