Synthesis, crystal structure and characterization of ternary complexes of lanthanide(III) 3,5-di-tert-butyl-gamma-resorcylate with substituted pyridine-N-oxide

Twenty one ternary complexes of lanthanide with 3,5-di-tert-butyl-gamma-res orcylic acid (L) and seven different substituted pyridine-N-oxides (L1-7), with compositions of REL3L21-7. nH(2)O (RE=Nd, Gd, Er; L-1=4-picoline-N-oxi de; L-2=4-phenyl-pyridine-N-oxide; L-3=pyridine-N-Oxide; L-4=3-picoline-N-o xide; L-5 =quinoline-N-oxide; L-6=iso-quinoline-N-oxide; L-7=4-methoxyl-pyr idine-N-oxide; n=0, 1, 2, 5), were synthesized and characterized by means o f elemental analysis, electrical conductivity, thermal analysis and IR spec tra. The novel crystal structure of ErL3L23.(EtOH) has been determined by a single-crystal X-ray diffraction method. It shows that each erbium ion is linked to three 3,5-di-tert-butyl-gamma-resorcylic acid ions through two di fferent types of dentation modes in which only the carboxylate oxygen atoms participate. The coordination geometries of erbium ion can be described as a distorted octa-coordinated bicapped trigonal prism. (C) 1999 Elsevier Sc ience Ltd. All rights reserved.