Metal(II) Nicotinamide Complexes Containing Succinato, Succinate and Succinic Acid: Synthesis, Crystal Structures, Magnetic, Thermal, Antimicrobial and Fluorescent Properties

Abstract

Four novel divalent transitional metal succinates (suc) with nicotinamide (nia), {[M(μ-suc)(H <inf>2</inf>O) <inf>2</inf>(nia) <inf>2</inf>]·2H <inf>2</inf>O} <inf>n</inf> [M = Mn (1), Ni (2)], [Cu(suc)(nia) <inf>2</inf>] (3) and [Ni(H <inf>2</inf>O) <inf>4</inf>(nia) <inf>2</inf>](suc)·(H <inf>2</inf>suc) (4), have been synthesized and characterized by elemental analyses, IR and TG-DTA. X-ray analyses of 2 and 4 reveal that they crystallize in a triclinic space group, Complex 2 is a 1-D coordination polymer, in which the metal(II) ions exhibit an octahedral geometry with two suc, two nia and two aqua ligands. The nia ligand is N-bonded, while the suc ligand bridges the metal centres through the carboxylate groups. 4 contains the [Ni(H <inf>2</inf>O) <inf>4</inf>(nia) <inf>2</inf>] 2+ complex cations, uncoordinated suc and H <inf>2</inf>suc species, which are connected into a two-dimensional layered structure by the combination of N-H...O and OW-H...O hydrogen bonds. This is one of the scarce examples encountered in coordination chemistry, which contains uncoordinated suc and H <inf>2</inf>suc at the same time. The spectroscopic and structural analysis, luminescent and magnetic properties and the antimicrobial activities of the synthesized complexes were investigated. © 2010 Springer Science+Business Media, LLC.