名称:
Synthesis and characterization of mononuclear nickel(II) and cobalt(II) complexes of 2,2,4,4-tetrakis(3,5-dimethylpyrazolyl)-6,6-diphenyl-2λ5,4λ5,6λ5-cyclotriphosphaza-1,3,5-triene L: crystal structure of [NiLCl2]
摘要:
Three complexes [NiLCl2] 2a, [NiLBr2] 2b and [CoLCl2] 2c, where L is the potentially multidentate ligand 2,2,4,4-tetrakis(3,5-dimethylpyrazolyl)-6,6-diphenyl-2lambda5,4lambda5,6lambda5-cyclotriphosphaza-1,3,5-triene, have been prepared and characterized spectroscopically (IR, H-1 and P-31 NMR) and in the case of 2a, crystallographically. The Ni(II) atom in 2a has been shown to exist in a distorted trigonal-bipyramidal geometry in which the halide atoms and a ring nitrogen atom define the equatorial plane; the axial positions are occupied by two nitrogen atoms derived from two pyrazolyl rings. Crystals of 2a are monoclinic with space group C2/c and unit cell dimensions: a = 38.190(8), b = 9.225(3), c = 21.830(4) angstrom, beta = 108.29(2)-degrees and Z = 8. The structure was refined to final R = 0.045 for 4414 observed data.