Chromium(III), Cobalt(II), Nickel(II) and Copper(II) Complexes of (Dimethyl-Phosphinyl)Methanamine. Crystal Structure of<i>fac</i>-Tris{(Dimethyl-Phosphinyl)Methanamine-N, O}Nickel(II) Chloride Trihydrate

Abstract

Abstract The complexes CrL3Cl3.2H2O (I), CoL3Cl2.3H2O (2), CoL3Br2.H2O (3), NiL3Cl2.3H2O (4) and CuLCl2 (5), where L is (dimethylphosphinyl)methanamine, were synthesized and characterized by infrared and electronic spectra. The X-ray single crystal analysis of 4 (trigonal, space group R 3c, a = 11.340(2), c = 63.708(8) Å, V = 7095(2) Å, Z = 12) revealed a structure containing tris-chelated fac[NiL3]2 + cations in which L is coordinated via the amino nitrogen and phosphoryl oxygen atoms. The statistically disordered chloride ions and water molecules occupy voids between the cations. On the basis of spectral data, 1,2 and 3 are formulated as consisting of pseudo-octahedral tris-chelate cations [ML3]n + (n = 2 or 3) and non-coordinated halide ions and water molecules. A polymeric structure in which Cu(II) is surrounded by four bridging chlorides and two bridging L ligands is ascribed to 5. Key Words: Chromium(III)cobalt(II)nickel(II)copper(II)(dimethylphosphinyl)methanamineX-raystructure