Abstract
New divalent transition metal nicotinamide (nia) complexes containing fumarate (fum) dianion and fumaric acid (H(2)fum), [M(H2O) 4(nia)(2)](fum)center dot(H(2)fum) [M = Co (1), Cu (2), and Ni (3)] have been synthesized. The compounds were characterized by elemental analyses, infrared, UV-vis, XRPD, and TGA. Structural analysis of 3 using single-crystal X-ray diffraction technique revealed that the Ni(II) ion is coordinated by four aqua and two nia ligands in an octahedral geometry. The structure of 3 is completed with fumarate (fum(2-)) dianion acting as a counterion while fumaric acid (H(2)fum) is present as a molecule of solvation. The three complexes were investigated for biological activities.