Abstract: The preparation and characterization of a series of dinuclear copper(Ⅱ)complexes, Cu₂L₂IA(ClO₄₂, are presented. The ligand L is 1,10-phenanthroline(phen), 5-nitro-1,10-phenanthroline(NO₂ phen)and 2,2'-bipyridine, and IA denotes the dianion of iodanilic acid. The complexes are characterized by elemental analysis, IR, electronic spectra, ESR and variable temperature magnetic susceptibility measurements. The coordination geometry of copper(Ⅱ)ion is probably a distorted square pyramid. Room temperature ESR spectra of all the complexes studied show the ΔM_s=±2 half field transitions. The variable temperature magnetic susceptibility of Cu₂(phen)₂IA(ClO₄)2 had been measured(4.2～300 K)and the exchange parameter,J, was found to be -29.18 cm^-1 using the Heisenberg model. This indicates that an antiferromagnetic interaction exists between the metal ions.

Key words: iodanilic acid, Cu(Ⅱ), dinuclear complex, synthesis, magnetism