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Preparation and properties of (selenocyanato)bis(2,2'-bipyridine)copper(II) selenocyanate and crystal structure of its α-modification

A. Sedov, M. Kabešová, M. Dunaj-Jurčo, J. Gažo, and J. Garaj

Department of Inorganic Chemistry, Slovak Technical University, CS-812 37 Bratislava


Abstract:  Results reported in this paper concern the solving of the crystal structure of α-[Cu(bpy)2NCSe]NCSe. The structural unit consists of a complex cation and a selenocyanate anion. Coordination polyhedron of the central atom is trigonal bipyramidal in shape, with a square-pyramidal distortion. The selenocyanate group is coordinated as a unidentate ligand through the nitrogen atom in the equatorial plane of the coordination polyhedron. In the complex under investigation, existence of two different kinds of selenocyanate groups has also been proved by means of infrared spectra. The distortion of the trigonal bipyramidal coordination polyhedron of the Cu(II) central atom has also been registered as a splitting of ligand field absorption bands. This result confirms a suggestion about a possible correlation between the type of coordination polyhedra of Cu(II) and the shape of ligand field band in electronic absorption spectra. Two different forms of the above-mentioned compound have been prepared under various conditions of preparation. They are preliminarily regarded as distortion isomers which are intermediates between a trigonal bipyramid and a tetragonal pyramid.

Full paper in Portable Document Format: 371a43.pdf


Chemical Papers 37 (1) 43–52 (1983)

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