@article {3926,
	title = {Cationic lanthanide complexes of N,N{\textquoteright}-bis(2-pyridylmethyl)ethylenediamine-N,N{\textquoteright}-diacetic acid (H(2)bped)},
	journal = {Inorganic Chemistry},
	volume = {36},
	number = {7},
	year = {1997},
	note = {ISI Document Delivery No.: WQ490Times Cited: 22Cited Reference Count: 51},
	month = {Mar},
	pages = {1316-1321},
	type = {Article},
	abstract = {A series of monocationic lanthanide complexes containing the ligand N,N{\textquoteright}-bis(2-pyridylmethyl)ethylenediamine-N,N{\textquoteright}-diacetate(2-) (bped(2-)) have been prepared and isolated as either the hexafluorophosphate or perchlorate salts. The complexes have been characterized by H-1 and C-13 NMR, +LSIMS, IR, and elemental analysis. Complex formation constants have been measured in water at 25 degrees C (mu = 0.16 M (NaCl)). log K (Ln(bped)](+)) (log K([Ln(bped)(OH)])): Ln = La, 10.81 (0.06); Ln = Nd, 11.99 (1.45); Ln = Gd, 12.37 (2.10); Ln = Ho, 12.31 (3.00); Ln = Yb, 13.32 (4.43). The stability constants for [M(bped)](+) increase from La(III) to Nd(III), plateau to Ho(III), and increase again to Yb(III), while the formation constants for [Ln(bped)(OH)] increase almost linearly with atomic number. The solution structures of the [Ln(bped)](+) complexes have been probed by multinuclear NMR (H-1, C-13, O-17) studies, and these indicate only one isomer present in solution; this isomer has 2-fold symmetry and is rigid at 20 degrees C on the NMR time scale. O-17 NMR studies of the paramagnetic lanthanides indicate that the hydration number is 3, [Ln(bped)(H2O)(2)](+), and that an overall coordination number of 9 is maintained across the lanthanide series.},
	keywords = {AQUEOUS-SOLUTION, CARBOXYLATES, COMPLEXES, COORDINATION-NUMBER, EDTA, GADOLINIUM(III), NMR, NUCLEAR MAGNETIC-RESONANCE, polarization, SHIFT-REAGENTS, SHIFTS, WATER-MOLECULES},
	isbn = {0020-1669},
	url = {<Go to ISI>://A1997WQ49000007},
	author = {Caravan, P. and Mehrkhodavandi, Parisa and Orvig, Chris}
}
@article {3926,
	title = {Cationic lanthanide complexes of N,N{\textquoteright}-bis(2-pyridylmethyl)ethylenediamine-N,N{\textquoteright}-diacetic acid (H(2)bped)},
	journal = {Inorganic Chemistry},
	volume = {36},
	number = {7},
	year = {1997},
	note = {ISI Document Delivery No.: WQ490Times Cited: 22Cited Reference Count: 51},
	month = {Mar},
	pages = {1316-1321},
	type = {Article},
	abstract = {A series of monocationic lanthanide complexes containing the ligand N,N{\textquoteright}-bis(2-pyridylmethyl)ethylenediamine-N,N{\textquoteright}-diacetate(2-) (bped(2-)) have been prepared and isolated as either the hexafluorophosphate or perchlorate salts. The complexes have been characterized by H-1 and C-13 NMR, +LSIMS, IR, and elemental analysis. Complex formation constants have been measured in water at 25 degrees C (mu = 0.16 M (NaCl)). log K (Ln(bped)](+)) (log K([Ln(bped)(OH)])): Ln = La, 10.81 (0.06); Ln = Nd, 11.99 (1.45); Ln = Gd, 12.37 (2.10); Ln = Ho, 12.31 (3.00); Ln = Yb, 13.32 (4.43). The stability constants for [M(bped)](+) increase from La(III) to Nd(III), plateau to Ho(III), and increase again to Yb(III), while the formation constants for [Ln(bped)(OH)] increase almost linearly with atomic number. The solution structures of the [Ln(bped)](+) complexes have been probed by multinuclear NMR (H-1, C-13, O-17) studies, and these indicate only one isomer present in solution; this isomer has 2-fold symmetry and is rigid at 20 degrees C on the NMR time scale. O-17 NMR studies of the paramagnetic lanthanides indicate that the hydration number is 3, [Ln(bped)(H2O)(2)](+), and that an overall coordination number of 9 is maintained across the lanthanide series.},
	keywords = {AQUEOUS-SOLUTION, CARBOXYLATES, COMPLEXES, COORDINATION-NUMBER, EDTA, GADOLINIUM(III), NMR, NUCLEAR MAGNETIC-RESONANCE, polarization, SHIFT-REAGENTS, SHIFTS, WATER-MOLECULES},
	isbn = {0020-1669},
	url = {<Go to ISI>://A1997WQ49000007},
	author = {Caravan, P. and Mehrkhodavandi, Parisa and Orvig, Chris}
}
