Synthesis and physical studies of lanthanide(III) complexes of N,N-bis(2-hydroxyethyl)glycinate (bicinate, bicH(2)(-)): molecular and crystal structure of [Gd(O2CMe)(bicH(2))(phen)(H2O)](ClO4) phen 3H(2)O (phen=1,10-phenanthroline)

摘要

Synthetic and isolation procedures are described that allow access to the new complexes [Ln(O2CMe)(bicH(2))(phen)(H2O)](ClO4)(.)phen(.)3H(2)O, where Ln == Gd(1), Er(2), Pr(3) and Nd(4). bicH(2)(-) = the monoanion of N,N-bis(2-hydroxyethyl)glycine (bicine) and phen = 1,10-phenanthroline. The structure of I has been determined by single-crystal X-ray crystallography. The Gd-III ion is in a 9-coordinate, tricapped trigonal prismatic ligand environment. The acetate and phen ligands are bidentate chelating, while the bicinate(-1) ion functions as a tetradentate chelate with the ligated atoms being the nitrogen, the two hydroxyl oxygens arid one of the carboxylate oxygens. The crystal structure is stabilized by H bonds and aromatic stacking interactions, Complexes 2, 3 and 4 seem to be isostructural with 1. The complexes were characterized by elemental analyses, thermal techniques, room temperature magnetic moments arid spectroscopic (IR, far-IR, solid state f-f) methods. All data are discussed in terms of the nature of bonding and known or assigned structures. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 71]