Collect. Czech. Chem. Commun. 1982, 47, 409-420

The crystal and molecular structure of copper(II) bis-(ethylenediamine)nitrate selenocyanate

Viktor Vrábel and Ján Garaj

Institute of Chemical Technology, Slovak Institute of Technology, Department of Analytical Chemistry, 880 37 Bratislava


The crystal structure of [Cuen2(NO3)]SeCN was solved by the single-crystal X-ray structural analysis method. The compound crystallizes in the monoclinic system with space group Pc. The unit cell has dimensions: a = 0.9254(3), b = 1.4018(3), c = 0.9722(5) nm, β = 99.20(3)°. The structure was refined by the least squares method to a final value of R = 6.8% for 1965 observed reflections. The crystal structure consits of polymeric cation chain [Cuen2(NO3)]+ and of free uncoordinated SeCN- anions. The nitrate ion NO-3 forms a bridging unit between two [Cuen3]2+ cations. The coordination polyhedron around the Cu(II) atom is a deformed octahedron, formed of two ethylendiamine molecules and two oxygen atoms of the NO-3 ions, bonded to divalent copper in the axial direction along the long coordinates. The crystal structure contains selenocyanate which is not bonded through a covalent bond to the central atom, but there are intermolecular contacts with its immediate surroundings.