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Journal of Applied Sciences
Year: 2007  |  Volume: 7  |  Issue: 3  |  Page No.: 434 - 441

Synthesis, Structural Characterization and Biological Activity of Peroxo Complexes of Zirconium (IV) Containing Organic Acid and Amine Bases

Jahanara Nasrin and M. Saidul Islam    

Abstract: The study was extended to isolate the peroxo complexes of Zr (IV) containing organic acid and amine bases. The Zr (IV) complexes have been found to oxidize allyl alcohol and triphenylphosphine as well as triphenylarsine to their respective oxides. The analytical data are in good agreement with the proposed empirical formulae of the present complexes. The complexes display v(C = O) bands at ~1630 cm-1 and v(C-O) bands at ~1412 cm-1 significantly lower than the values of amino acid (~1650 and ~1450 cm-1). These indicate the coordination of amino acid through their carboxylate anion. The broad band observed at about 3217-3350 cm-1 for v (N-H) modes indicate the coordination of amino group through nitrogen atom of amino acid. The metal peroxo grouping gives rise to three IR active vibrational modes. These are predominantly O-O stretching v1, the symmetric M-O stretch v2 and the antisymmetric M-O stretch v3. The magnetic moment values indicated that these complexes were diamagnetic in nature suggesting no changes in their oxidation states of the metal ions upon complexation. These data also consistent with six fold coordination of Zr (IV). The electronic spectral data of the complexes showed bands in the region 230-372 nm due to the charge transfer band only. All the complexes of Zr (IV) did not show any remarkable antibacterial activity. It is interesting to note that these complexes were found to be fully inactive against the three pathogenic fungi A. niger, A. fumigatus and A. flarus. Moreover, all the complexes of Zr (IV) metals showed toxic effect against the brine shrimp.

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