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Synthesis and magnetism of 2-hydroxy-1,3-propanediylbis-(oxamato) bridged trinuclear copper(II) complexes
Authors:Ming-Ming Miao  Dai-Zheng Liao  Zong-Hui Jiang  Geng-Lin Wang
Institution:(1) Department of Chemistry, Nankai University, 300071 Tianjin, P. R. China
Abstract:Summary 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), 2,2prime-bipyridyl (bipy) or 4,4prime-dimethyl-2,2prime-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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