O-phenylenebis(oxamato) bridged trinuclear copper(II) complexes: synthesis and magnetic properties |
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Authors: | Ming-Ming Miao Dai-Zheng Liao Zong-Hui Jiang Peng Cheng Geng-Lin Wang |
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Institution: | (1) Department of Chemistry, Nankai University, 300071 Tianjin, P. R. China |
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Abstract: | Summary 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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