Syntheses, crystal structures and antibacterial activities of [Cu2(C11H11NO5S)2(H2O)4] • 5H2O and [Ni2(C11H11NO5S)2(H2O)4] • 2H2O

The binuclear complexes [Cu2L2(H2O)(4)] center dot 5H(2)O (1) and [Ni2L2(H2O)(4)] center dot 2H(2)O (2) (where L = C11H11NO5S, H2L = 2-[(3-formyl-5-methyl-2-hydroxy-benzylidene)-amino]ethanesulfonic acid) have been synthesized and characterized by IR, elemental analysis and X-ray diffraction. The crystals belong to the monoclinic system, space group P2(1/c). Complex 1: a = 16.8902(12), b = 11.2829(6), c = 17.4249(11) angstrom; beta = 106.709(4)degrees; S = 1.131; V = 3180.5(3) angstrom(3); Z = 4; D-Calcd = 1.729 g cm(-3); F(000) = 1712; mu = 1.554 mm(-1); R-1 = 0.0519, wR(2) = 0.1349; complex 2: a = 11.399(2), b = 19.985(3), c = 7.3694(10) angstrom; beta = 108.664(7)degrees; S = 1.157; V = 1590.6(4) angstrom(3); Z = 2; D-Calcd = 1.604 g cm(-3); F(000) = 800; mu = 1.388 mm(-1); R-1 = 0.1859, wR(2) = 0.4346. The geometry around each metal(II) center can be described as slightly distorted octahedral. Water-sulfonic clusters and (H2O)(4) water clusters can be observed for 1 from the crystal packing diagram, while cavity and offset face-to-face pi-pi stacking can be observed for 2. The complexes have been tested for the antibacterial activities which show antibacterial activities of 1 for beta-hemolytic streptococcus, Staphylococcus aureus and Escherichia coli, and the antibacterial activity of 2 only for beta-hemolytic streptococcus.