SYNTHESES AND MAGNETISM OF TRINUCLEAR COPPER(II) 1,2-ETHYLENEBIS(OXAMIDO) COMPLEXES

摘要

Four novel trinuclear copper(II) complexes have been synthesized, namely {[Cu(ebo)][Cu(L)](2)}(ClO4)(2), where ebo denotes 1,2-ethylenebis(oxamido) and L is 2,2'-bipyridyl (bpy), 4,4'-dimethyl-2,2'-bipyridyl (Me(2) bpy), 1,10-phenanthroline (phen) or 5-nitro-1,10-phenanthroline (NO2-phen). Based on IR, elemental analyses, conductivity measurements and electronic spectra these complexes are proposed to have oxamido-bridged structures and to consist of three copper(II) ions in which each metal ion has a square planar environment. The temperature dependence of the magnetic susceptibility of {[Cu(ebo)][Cu(NO2-phen)](2)}(ClO4)(2) . 2H(2)O has been studied in the 4-200 K range, giving the exchange integral J = -80.9 cm(-1). The result revealed the operation of an antiferromagnetic spin-exchange interaction between the adjacent copper ions. [References: 24]