Abstract
The synthesis, crystal structures and magnetic properties of two different copper(II) complexes of formula [Cu(L 1)(dca)] n · nClO 4 ( 1) and [Cu(L 2)] 2(dca)(ClO 4) ( 2) [L 1 = N, N-dimethylethylene- N′-(pyridine-2-carbaldiiminato), HL 2 = N, N-dimethylethylene- N′-salicylaldiiminato, dca = dicyanamide anion] are described. Spectroscopic and electrochemical properties have also been discussed. A one-dimensional chain structure with single, symmetrical, μ 1,5-dca bridges is found in compound 1. The copper atom in 1 has a square pyramidal geometry. A tridentate Schiff base ligand, having NNN donor sites, and one nitrogen atom from dca occupy the basal plane. N(18) of a neighbouring unit occupies the apical site. The Schiff base used in compound 2 is a tridentate anion with NNO donor sites, which changes the structure in a dinuclear unit of copper atoms bridged by single end-to-end dicyanamide ion. The environment around copper in 2 is square planar. Magnetic susceptibility measurements for 1 and 2 reveal the occurrence of weak antiferromagnetic interaction through the dca ligand.
Published Version
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