SYNTHESIS AND CRYSTAL STRUCTURE OF Ni(II) COMPLEX WITH 2-(DIPHENYLPHOSPHINO)BENZALDEHYDE SELENOSEMICARBAZONE

G.A. Bogdanovic¹, Anne Spasojevic-de Biré¹, I.D. Breski², V.M. Leovac³ and M.D. Revenko⁴

¹PCM, Ecole Centrale Paris, 92295 Châtenay-Malabry Cedex, France
²Faculty of Chemistry, University of Belgrade, P.O. Box 158, 11001 Belgrade, Yugoslavia
³Institute of Chemistry, Faculty of Sciences, University of Novi Sad, 21000 Novi Sad, Yugoslavia
⁴Department of Chemistry, State University of Moldova, 277014 Kishinau, Moldova

Keywords: Nickel(II) complex; Ligand 2-(diphenylphosphino)benzaldehyde selenosemi-carbazone

Synthesis and crystal structure of Ni(II) square-planar complex with 2-(diphenylphosphino)benzaldehyde thiosemicarbazone, having formula [Ni(L)Py]NO₃, has been described previously [1]. Now, we wish to present the synthesis and crystal structure of Ni(II) complex with 2-(diphenylphosphino)benzaldehyde selenosemicarbazone whose formula is [Ni(L)NCS]. The compound has been isolated in form of red crystals via reaction of warm methanolic solution of Ni(NO₃)₂ and ligand in the presence of an excess of NH₄NCS.

Crystal data: C₂₁H₁₈N₄NiPSSe, triclinic system, space group P1-, a=9.432(1) Ä, b=9.689(1) Ä, c=12.900(1) Ä, a=77.65(1)^o, b=77.30(1)^o, g=74.57(1)^o, V=1093.3(3) ij, M_r=527.09, D_c=1.601 g/cm³, F(000)=530, m(MoKa)=2.736 mm^-1, l(MoKa)=0.71073 Ä, R=0.0413, R_w=0.1000. The intensities were collected on a CAD-4 diffractometer with w/2q scaning technique. The structure was solved by Patterson methods using SHELXS86 and refined by SHELXL93 on the basis of 2391 observed reflections (I>2s₁) for 262 refined parameters.

The Ni atom has distorted square-planar coordination geometry (Fig. 1). The greatest deviation is shown by the P atom, which deviates from the least-squares plane through Ni, N1, Se and N4 by 0.486(4) A. The six membered chelate ring containing the P atom has nonplanar conformation.

1. V.M. Leovac, B. Ribár, Gy. Argay, A. Kálmán, I. Breski: J. Coord. Chem., 39 (1996) 11-19.

Fig. 1