Add time:07/26/2019         Source:sciencedirect.com

Paramagnetic, pentacoordinated 2,9-dimethyl- 1,10-phenanthroline adducts of bis(O, O-alkylene dithiophosphates) of nickel(II) with the general formula (where G(OH)2 = 2,3-dimethylbutane-2,3-diol, 2- methylpentane-2,4-diol and butane-2,3-diol) have been prepared by the reactions of O, O-alkylene dithiophosphates of nickel(II) with 2,9-dimethyl- 1,10-phenanthroline in a 1:1 molar ratio. IR, electronic spectral and magnetic measurements have been used to investigate plausible structure of these complexes. The crystal structure of shows both chelating and monodentate dithiophosphate moieties. Crystals of the above adducts are monoclinic, space group P21/c, a = 20.077(1), b = 11.599(2), c = 14.929(2) Å, β = 107.65(5)° and Z = 4.The structure of the compound was refined to R = 0.070 for 2809 unique observed diffractometer data. The structure may be interpreted as involving a pentacoordinated nickel atom with a distorted trigonal bipyramidal geometry. The equatorial positions are occupied by N atoms of 2,9-dimethyl- 1,10-phenanthroline (NiN(av.) = 2.01 Å), one axial (NiS(3) = 2.499(3) Å) and one equatorial (NiS(4) = 2.344(3) Å) position by the S atoms of a bidentate O, O-alkylene dithiophosphate moiety, and the remaining axial position (NiS(1) = 2.398(3) Å) is occupied by the S atom of the other monodentate alkylene dithiophosphate moiety.

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