Abstract
A new tris(ethylenediamine)nickel(II) complex [Ni(en)(3)]GeS2(OH)(2)center dot H2O containing a zero-dimensional thiohydroxogermanate [GeS2(OH)(2)](2-) anion was synthesized using a solvothermal reaction. The compound crystallizes in monoclinic space group P2(1)/n with cell parameters a =-8.676(3) angstrom, b = 13.574(4) angstrom, c = 13.976(4) angstrom and beta = 92.67(2)degrees. The ethylenediamine (en) ligands are bidentate to the Ni2+ through the N atoms of the amine group resulting in a distorted octahedral environment around the transition metal. The solid-state( 1)H NMR shows four broad singlets attributed to the -CH2 and -NH2 protons of the (en) in addition to H2O and -OH protons. The EPR results indicate that the octahedrally coordinated Ni(2+ )cations are paramagnetic with two unpaired electrons. In agreement with the EPR results, the ZFC/FC magnetization measurements show a paramagnetic response. The title compound is a wide bandgap semiconductor (3.9 eV) and exhibits photoluminescence emission at 488 nm upon excitation (325 nm).