X-ray crystal structures, spectroscopic and magnetic measurements of dinuclear alkoxo-bridged copper(II) compounds with substituted bis(2-benzimidazolyl)alkane ligands. First X-ray structure of a copper(II) dinuclear propoxo-bridged compound

摘要

The synthesis and characterization of three new alkoxo-bridged dinuclear copper(11) compounds are described, all having the general formula [Cu-2(L)(2)(RO-)(2)](ClO4)(2)(ROH)(y)(H2O)(z), in which L = b2b (bis(2-benzimidazolyl)-2-butane) and b3b (bis(2-benzimidazolyl)-3-butane). ROH = MeOH, EtOH, I-PrOH, y = 1 or 2, z = 0 or 3. The X-ray structure has been solved from two compounds, [Cu-2(b2b)(2)(OCH3)(2)](ClO4)(2)(CH3OH)(2)(H2O)(3) (1) and from compound [Cu-2(b3b)(2)(C3H7O)(2)](ClO4)(2)(C3H7OH)(2) (3). These two compounds consist of dinuclear Cu(II) units with bridging methoxo group for 1 and an unique bridging propoxo group for 3 with two ligands linked to each copper via N, providing square-planar CuN2O2 chromophores. The latter one is the first dinuclear Cu(II) X-ray structure with bridging propoxo groups. Both dinuclear compounds are diamagnetic. (C) 2002 Elsevier Science Ltd. All rights reserved. [References: 27]