Abstract
Four novel trinuclear copper(II) complexes have been synthesized, namely {[Cu(pbaOH)][Cu(L)]2}(ClO4)2, where pbaOH = 2-hydroxy-1,3-propanediylbis(oxamato) and L is 1,10-phenanthroline (phen), 5-nitro-1,10-phenanthroline (NO2-phen), 2,2′-bipyridyl (bipy) or 4,4′-dimethyl-2,2′-bipyridyl (Me2bipy). Based on i.r. and electronic spectra, elemental analyses, and conductivity measurements 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-(pbaOH)][Cu(phen)]2}(ClO4) 2 has been studied in the 4.2–300 K range, giving the exchange integral J=- 111.9cm−1. The result revealed the operation of an antiferromagnetic spin-exchange interaction between adjacent copper ions.
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