Paramagnetic compounds [Ni(Phen)(i-Bu2PS2)(2)] (I), [Ni(Phen)(2)(i-Bu2PS2)](i-Bu2PS2) (II), and [Ni(Phen)(3)](i-Bu2PS2)(2) (III) (mu(eff) = 3.03-3.14 mu(B)) were synthesized by reacting Ni(i-Bu2PS2)(2) chelate with Phen. Their single crystals were grown. X-ray diffraction analysis of 11 was performed (CAD4 diffractometer, MoKalpha radiation, 1181 F-hkl, R = 0.0378). The crystals are monoclinic: a = 14.039(2) Angstrom, b = 18.030(2) Angstrom, c = 18.118(2) Angstrom; beta = 105.52(1)degrees, V = 4418.9(9) A(3), Z = 4, rho(calcd) = 1.259 g/cm(3), space group P2(1)/c. The structure is built of individual [Ni(Phen)(2)(i-Bu2PS2)](+) cations and i-BuPS2- anions. The coordination polyhedron of NiN4S2 is a distorted octahedron with four N atoms of two bidentate chelate ligands (Phen molecules) and with two S atoms of a bidentate cyclic ligand i-Bu2PS2-. The electronic spectroscopy data for molecular complex I and ionic complex III suggest the octahedral structure of the NiN2S4 and NiN6 chromophores, respectively.