Metal(II) nicotinamide complexes containing succinato, succinate and succinic acid: Synthesis, crystal structures, magnetic, thermal, antimicrobial and fluorescent properties

Four novel divalent transitional metal succinates (suc) with nicotinamide (nia), {[M(?-suc)(H 2O) 2(nia) 2]·2H 2O} n [M = Mn (1), Ni (2)], [Cu(suc)(nia) 2] (3) and [Ni(H 2O) 4(nia) 2](suc)·(H 2suc) (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 2O) 4(nia) 2] 2+ complex cations, uncoordinated suc and H 2suc 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 2suc 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