3 DIFFERENT COPPER(II) COORDINATION POLYHEDRA IN THE CRYSTAL-STRUCTURE OF BIS(4-PICOLINE)DITHIOCYANATO COPPER(II) COMPLEX, [CU(4-PIC)2(NCS)2] - EXPERIMENTAL-EVIDENCE OF A NEW TYPE OF MUTUAL INFLUENCE OF LIGANDS IN COMPLEXES

The crystal structure of bis(4-picoline)dithiocyanato copper(II) is reported. The compound crystallizes in space group P21, with a = 9.808(6), b = 26.752(10), c = 9.927(4) Å, β = 107.89(4)°, U = 2478(1) Å3, Z = 6, Dm = 1.48(2), Dx, = 1.47 g cm-3, μ(Cu-Kα) = 4.13 mm-1, F(000) = 1122, T = 293 K. Final R is 0.043 (Rw = 0.043) for 2400 observed reflections. The complex compound exhibits three different pseudo-octahedral coordination polyhedra for copper(II). The polyhedra differ in the degree of their tetragonal distortion. While two of them show "symmetrical" shortening and elongation, respectively, the third presents both an elongated and a shortened axial bond. © 1990.