Crystal Structure and Characterization of [Ni(RPOEt)2(C2H5OH)2](ClO4)2 [RPOEt = bis{(diphenylphosphinyl)methyl}ethyl phosphinate

Abstract

The compound [Ni(RPOEt)2(C2H5OH)2](ClO4)2 (1) [RPOEt = bis{(diphenylphosphinyl)methyl}ethyl phosphinate] has been prepared in the form of single crystals and characterized by elemental and thermal analyses, IR spectroscopy and by a single crystal X-ray diffraction study. The complex crystallizes in the triclinic $$ P\bar{1} $$ space group with a = 9.8773(5), b = 13.741(1), c = 14.287(1) A, α = 64.313(9), β = 70.280(5), γ = 89.973(7)o, V = 1620.5(2) A3, and Z = 1. The nickel(II) atom in 1, situated at the centre of symmetry, is coordinated by four oxygen atoms from two RPOEt ligands and two oxygen atoms from two ethanol molecules in a slightly distorted octahedral environment. The third phosphoryl-oxygen atom from the phosphinate ligand is hydrogen bonded to the oxygen atom of the ethanol molecule coordinated to nickel(II). The complex [Ni(RPOEt)2(C2H5OH)2]2+ cations are linked by the C–H···O hydrogen bonds into one-dimensional chains and by the composite π···π and C–H···π phenyl interactions into a final three-dimensional structure. A six-coordinate nickel(II) complex with a polyfunctional phosphine oxide based ligand—bis{(diphenylphosphinyl)methyl}ethyl phosphinate, has been obtained and characterized by elemental and TG/DTA analyses, IR spectroscopy and by a single crystal X-ray diffraction study.