SYNTHESIS AND CHARACTERIZATION OF (MU-OXALATO) NICKEL(II) COMPLEXES

摘要

Three new nickel(II) dinuclear oxalato-bridged compounds Ni(TAA)(ClO4). 0.5ox (1), Ni-2(APO-sal(2))ox . 2H(2)O (2) and Niphen(2)oxNiacac(2) . 4H(2)O (3) have been characterized [TAA = N(CH2CH2NH2)(3) ox = oxalate, phen = 1,10-phenanthroline, acac = acetylacetonate and APO-sal(2) is the Schiff base formed by the condensation of salicylaldehyde and 1,3-diamino-2-propanol]. The crystal structure of 1 has been deter mined by a single-crystal X-ray analysis. The nickel atom is coordinated by two oxygen atoms of an oxalato ligand and four nitrogen atoms belonging to TAA in an octahedral arrangement. The intermetallic distance of Ni(1)-Ni(2) is 5.412(1) Angstrom. Magnetic measurements (77-300 K) show that three compounds are antiferromagnetically coupled, J = -14.4, -11.25 and -19.3 cm(-1) for 1, 2 and 3, respectively. Copyright (C) 1997 Elsevier Science Ltd. [References: 19]