Solvent-Induced Unsymmetric Salamo-Like Trinuclear NiII Complexes: Syntheses, Crystal Structures, Fluorescent and Magnetic Properties

Solvent-induced trinuclear Ni-II complexes, [{Ni(L)(MeOH)}(2)(OAc)(2)Ni]center dot 2MeOH (1), [{Ni(L)(EtOH)}(2)(OAc)(2)Ni]center dot 2H(2)O (2), [{Ni(L)(n-PrOH)}(2)(OAc)(2)Ni]center dot 2H(2)O (3) and [{Ni(L)(i-PrOH)}(2)(OAc)(2)Ni] (4), have been prepared with an unsymmetric Salamo-like ligand H2L, and characterized via X-ray crystallography, FT-IR, UV-Vis and fluorescence spectra. In complexes 1, 2, 3 and 4, there are two ligand (L)(2-) moieties, two acetato ligands, two coordinated methanol, ethanol, n-propanol or i-propanol molecules, respectively, as well as other crystallizing solvent molecules. Two acetato ligands coordinated to the three Ni-II ions via usual Ni-O-C-O-Ni bridges, and four mu-phenoxo oxygen atoms coming from two [NiL(solvent)] units coordinate to the central Ni-II ions. Although different solvents are induced in the complexes, all the Ni-II ions are six-coordinated and adopt geometries of distorted octahedron. Magnetic measurements were performed on complex 2, an intramolecular antiferromagnetic interaction was observed between Ni-II ions and a simulation of the experimental data gives J = -2.96 cm(-1) and g = 2.30.