Abstract
Four new trinuclear copper(II) complexes bridged by o-phenylenebis(oxamato) (opba) and end-capped with 1,10-phenanthroline (phen), 5-nitro-1,10-phenanthroline (NO2-phen), 2,2′-bipyridyl (bipy) or 4,4′-dimethyl-2,2′-bipyridyl (Me2bipy), {[Cu(opba)][Cu(L)]2}(ClO4)2 (L = phen, NO2-phen, bipy or Me2bipy), have been synthesized and characterized. Based on i.r., elemental analyses, conductivity measurements and electronic spectra, oxamato-bridged structures consisting of three copper(II) ions in which each copper(II) ion has a square-planar environment are proposed. The temperature-dependent magnetic susceptibility of {[Cu(opba)][Cu(phen)]2} (ClO4)2 has been studied in the 4.2–300 K range, giving the exchange integral J = -134.4cm−1. The result revealed the operation of an antiferromagnetic spin-exchange interaction between the adjacent copper ions.
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