The structures of the quinoline adduct with bis(diethyldithiophosphinato)nickel(II) and the 1,10-phenanthroline and 2,9-dimethyl-1,10-phenanthroline adducts with bis(0,0 '-dimethyldithiophosphato)nickel(II) have been determined by single-crystal X-ray techniques. The nickel atom is hexacoordinated in the 1,10-phenanthroline adduct and pentacoordinated in the quinoline adduct as well as in the 2,9-dimethyl-l, 10-phenanthroline adduct. These results suggest that pentacoordinated mixed-ligand complexes of nickel(II) can be obtained by the addition of an appropriate ligand, which may be either monodentate or bidentate, to the planar nickel(II) dithiophosphates or dithiophosphinates.

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