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Abstract
The binuclear complexes [Cu2L2(H2O)4] · 5H2O (1) and [Ni2L2(H2O)4] · 2H2O (2) (where L = C11H11NO5S, H 2 L = 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 P21/c. Complex 1: a = 16.8902(12), b = 11.2829(6), c = 17.4249(11) Å; β = 106.709(4)°; S = 1.131; V = 3180.5(3) Å3; Z = 4; D Calcd = 1.729 g cm−3; F(000) = 1712; μ = 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) Å; β = 108.664(7)°; S = 1.157; V = 1590.6(4) Å3; Z = 2; D Calcd = 1.604 g cm−3; F(000) = 800; μ = 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 π–π stacking can be observed for 2. The complexes have been tested for the antibacterial activities which show antibacterial activities of 1 for β-hemolytic streptococcus, Staphylococcus aureus and Escherichia coli, and the antibacterial activity of 2 only for β-hemolytic streptococcus.
Acknowledgements
This work was supported by the Natural Science Foundation of the Guangxi Zhuang Autonomous Region of the P.R. China (grant 0339034 and 0731053) and the Science Research Foundation of Guangxi University.