synthesis of binuclear monohydroxo bridged copper(ii) complexes with 1,10-phenanthroline and 4,4'-dimethyl-2,2'-bipyridine

tow new compound of type [(chelate)2cu-oh-cu(chelate)2] x3.nh2o, where chelate=1,10-phenanthroline; x=cl¯(n=3.5) and chelate=4,4'-dimethyl-2,2'-bipyridine;  (n=5) have been synthesized and their properties investigated. the complexes show room temperature magnetic moment order of 1.0 b.m. per copper atom. the x-band esr spectrum of powdered samples at room temperature shows typical dm=1 transition at gav=2.075 for 1,10-phenanthroline and gav=2.085 for 4,4'-dimethyl-2,2'-bipyridine, and much weaker dm=2 transition at half field which is the characteristic of dimeric unit.