O-phenylenebis(oxamato) bridged trinuclear copper(II) complexes: synthesis and magnetic properties

✍ Scribed by Ming-Ming Miao; Dai-Zheng Liao; Zong-Hui Jiang; Peng Cheng; Geng-Lin Wang

• Publisher: Springer
• Year: 1996
• Tongue: English
• Weight: 285 KB
• Volume: 21
• Category: Article
• ISSN: 0340-4285
• DOI: 10.1007/bf00136541

✦ Synopsis

Four new trinuclear copper(II) complexes bridged by o-phenylenebis(oxamato) (opba) and end-capped with 1,10-phenanthroline (phen), 5-nitro-l,10-phenanthroline (NO2-phen), 2,2'-bipyridyl (bipy) or 4,4'-dimethyl-2,2'bipyridyl (Me2bipy), {[Cu(opba)][Cu(L)]2}(C104)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} (C10r 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.