V-subtituted lindqvist-type polyoxometalates: preparation, structural characterization and antibacterial activity
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A series of six V-substituted Lindqvist type polyoxometalate [M2V4O19](4-) (M = Mo, W) have been successfully prepared in good yields. Their structures were identified using elemental analysis, FT-IR, H-1 NMR, P-31 NMR, ICP-MS, and TGA. The antibacterial activity of these new series of V-substituted Lindqvist type polyoxometalates were carried out by disc diffusion method with gram-positive Staphylcoccus aureus ATCC 25923 and gram-negative Escherichia coli ATCC 25922 bacteria and some of the tested polyoxometalates have shown greater antibacterial activity than Ofloxacin (standard antibiotic). Moreover the MIC values of [Ph4P](4)[W2V4O19] (1b) and [Ph4P](4)[Mo2V4O19] (2b), against Staphylcoccus aureus bacterial strain are 1.22 and 9.76 mu g/ml respectively.