Mononuclear and binuclear Cu(II) complexes of some tridentate aroyl hydrazones. X-ray crystal structures of a mononuclear and a binuclear complex
作者:Satyajit Mondal、Sumita Naskar、Ayan Kumar Dey、Ekkehard Sinn、Carla Eribal、Steven R. Herron、Shyamal Kumar Chattopadhyay
DOI:10.1016/j.ica.2012.12.018
日期:2013.3
Cu(II) complexes of eight N, N, O-donor hydrazone ligands, obtained by condensation of pyridine-2-carbaldehyde and 2-acetylpyridine with four aroyl hydrazides, are reported. Reactions of Cu(ClO4)(2) center dot 6H(2)O with the pyridine-2-carbaldehyde hydrazones (L1H, L2H, L3H, L4H) in presence of Et3N, in 1: 2: 2 molar ratio, lead to isolation of mononuclear octahedral Cu(II) complexes of formula [Cu(L)(2)] (L = L-1 , L-2 , L-3 , L-4 ). However, for the 2-acetylpyridine hydrazones (L5H, L6H, L7H, L8H) reactions under similar conditions yield dichloro bridged complexes of the type [Cu-2(mu-Cl)(2)(L')(2)] (L' = L-5 , L-6 , L-7 , L-8 ), where each Cu(II) ion is in a square-pyramidal geometry, the chloride ions coming from the in situ reduction of perchlorate by the 2-acetylpyridine hydrazones. The X-ray crystal structures of [Cu(L-1)(2)] and [Cu-2(mu-Cl)(2)(L-5)(2)] are reported. The spectroscopic and electrochemical behaviors of the complexes are also reported. (C) 2013 Elsevier B.V. All rights reserved.