Synthesis, crystal structure, magnetic, thermal and fluorescent properties of [Co(H2O)4(nia)2](suc)·(H 2suc)

Abstract

A new cobalt(II) complex, [Co(H2O)4(nia) 2](suc)·(H2suc) [nicotinamide = nia, succinate = suc2-], has been synthesized and characterized by elemental analysis, IR, TG-DTA and single-crystal X-ray diffraction. It contains [Co(H 2O)4(nia)2]2+ complex cations, uncoordinated suc2- anios and H2suc species. In the complex cation the cobalt(II) ion is coordinated by four aqua and two nia ligands in a distorted octahedral geometry. The suc2- dianion acts as a counter-ion, while H2suc is present as a molecule of solvation. A three-dimensional network is formed by O-H?O and N-H?O hydrogen bonds. The title complex exhibits luminescence in the solid state at room temperature. The magnetism of the complex was studied over the temperature range 1.8 - 300 K. © 2010 Verlag der Zeitschrift für Naturforschung, Tübingen.