Collect. Czech. Chem. Commun. 1983, 48, 2893-2902

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

Viktor Vrábel, Jan Lokaj and Ján Garaj

Department of Analytical Chemistry, Slovak Institute of Technology, 812 37 Bratislava


The crystal structure of [Cu(en)2](SeCN)2 was solved by the heavy atom method and refined by the least squares method using the full matrix and anisotropic thermal parameters to a value of R = 0.063 for 660 observed reflections. The crystals are triclinic , with a space group of P1 and lattice parameters of a = 6.660(2), b = 9.360(2), c = 7.754(2) . 10-10 m, α = 129.22(2), β = 109.87(2) and γ = 92.38(2)°, Z = 1. The structure consists of discrete molecules that are centrosymmetric. The Cu(II) atom occupies a special position at the centre of symmetry and is coordinated by 4 nitrogen atoms from two bidentate ethylenediamine molecules: C-N 1.999(8) and 2.033(8) . 10-10 m and angle N1-Cu-N2, 84.1(3)°. The selenium atom in the SeCN group completes this square planar arrangement to form a deformed octahedron along the longer Cu...Se distance of 3.263(2) . 10-10 m. The ethylenediamine molecule has a non-symmetrical gauche arrangement with the carbon atoms C1 and C2 + 0.542 and -0.095 . 10-10 m above and below the N1-Cu-N2 coordination plane, respectively.