Synthesis, X-ray crystal structure and magnetic study of the 1D {[Cu(N,N-diethyl-1,2-ethanediamine)(mu(1,5)-dca)(dca)]}(n) complex

摘要

A new complex, {[CuL(mu(1.5)-dca)(dca)]}(n) (1), has been synthesized from the reaction of Cu(NO3)(2) (.) 3H(2)O, NN-diethyl-1,2-ethane-diamine (L) and sodium dicyanamide (Nadca) in aqueous medium. Single crystal X-ray analysis reveals that the complex has a 1D infinite zigzag chain structure in which copper(II) ions are bridged by single dicyanamide ligands in an end-to-end fashion. The chains propagate parallel to the crystallographic b-axis and they are stacked one upon another along the c-axis. The coordination environment of the copper(II) centers are distorted square-pyramidal. Of the four coordination sites of the basal plane of the square-pyramid, two are occupied by the nitrogen atoms of the diamine and the remaining two sites are occupied by the terminal nitrogen atoms of the bridging dca groups. One terminal nitrogen atom of a monodentate dca group occupies the apical position of the coordinated polyhedra. [CuL(dca)] units are then connected to each other through a mu(1.5)-dca bridge to form 1D chains. The variable temperature magnetic susceptibility measurements evidenced weakly antiferromagnetic interactions (J = -0.35 cm(-1)) in {[CuL(mu(1.5)-dca)(dca)]}(n) (1). (c) 2006 Elsevier Ltd. All rights reserved.