@article {3798,
	title = {Triplet-triplet energy transfer between organic molecules trapped in zeolites},
	journal = {Chemical Communications},
	number = {17},
	year = {1996},
	note = {ISI Document Delivery No.: VG303Times Cited: 7Cited Reference Count: 20},
	month = {Sep},
	pages = {2049-2050},
	type = {Article},
	abstract = {Double loading of a zeolite with a triplet energy donor and a triplet energy acceptor followed by selective irradiation into the donor absorption band leads to characteristic triplet state reactivity of the acceptor.},
	keywords = {ACID, DIFFUSION, probes},
	isbn = {1359-7345},
	url = {<Go to ISI>://A1996VG30300026},
	author = {Pitchumani, K. and Gamlin, J. N. and Ramamurthy, V. and Scheffer, J. R.}
}
@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}
}
