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Manan, Mohd Abdul Fatah Abdul
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article
Cadmium(II) Schiff base complex containing 5-fluoroisatin moiety
Abstract
The Schiff base ligand, HSB5FISA (<b>H1</b>), obtained by the condensation of S-benzyldithiocarbazate with 5-fluoroisatin, has been employed to synthesize a new cadmium(II) complex, Cd(SB5FISA)<sub>2</sub> (<b>2</b>) (SB5FISA = monoanionic form of <b>H1</b>). The complex has been characterized by elemental analysis, molar conductivity, magnetic susceptibility, inductively coupled plasma atomic emission spectroscopy (ICP-AES), Fourier-transform infrared spectroscopy (FT-IR) and ultraviolet-visible spectroscopy (UV-Vis). The crystallographic study of Cd(SB5FISA)<sub>2</sub>•2DMSO (<b>2a</b>) (DMSO = dimethyl sulfoxide) was conducted using single-crystal X-ray diffraction. The crystal structure of <b>2a</b> confirmed the presence of six-coordinated cadmium in a distorted octahedral environment. Ligand <b>H1</b> behaves in a tridentate monoanionic fashion, coordinating to a cadmium(II) metal centre through the thiolate sulfur, azomethine nitrogen and carbonyl oxygen. The antibacterial activity of both <b>H1</b> and <b>2</b> was examined against four different bacterial strains using the disc diffusion method. Complex <b>2</b> showed significant inhibitory effect against <i>Bacillus subtilis</i> with an inhibition zone of 14 mm, comparable to the standard antibiotic streptomycin.