Characterization and crystal structure of lanthanide cryptates of a ligand derived from 2,6-diformyl-pyridine

摘要

Seven lathanide cryptates [LnL](NO)(3) . nH(2)O (n = 1-3; Ln = La, Ce, Pr, Sm, Eu, Gd, Tb) were synthesized by the reactions of lanthanide nitrates with free ligand L (L was derived from the (2 + 3) condensation of 2,6-diformyl-pyridine (dfp) with tris-(2-aminoethyl) amine (tren)) and characterized by physical methods. ES-MS spectra show that except for La(III) cryptate, the other six are all stable in solution. The crystal structure of the Eu(III) cryptate showed a tricapped prismatic coordination geometry. (C) 2003 Elsevier Ltd. All rights reserved.