Abstract
The X-ray crystal structure of [Cu(crot)2(im)2(H2O)] (crot = 2-butenoate(crotonate) anion ; im = imidazole) has been determined by X-ray diffraction methods. The compound is built of neutral [Cu(crot)2(im)2(H2O)] entities linked through hydrogen bonds involving water molecules and carboxylate groups to give a chain structure running along the b axis. The copper atom is involved in a CuN2O2O′ chromophore and lies in a distorted square-pyramidal environment. Both electronic and EPR spectra are indicative of an essentially dx2-y2 ground state for the copper(II) ions. No exchange coupling has been detected down to 4.2 K by means of magnetic susceptibility measurements. This feature is discussed on the basis of the relative orientation of the coordination polyhedron around the metal atom and the bridging network. Copyright © 1996 Elsevier Science Ltd
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