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Microwave Synthesis, Spectroscopic, Thermal and Biological Studies of some Transition Metal Complexes containing Heterocyclic Ligand

Jyoti C. Ajbani, D. Smita Revankar, M. Revanasiddappa, Veerabhadra Swamy and S. Shankar

The microwave (MW) assisted synthesis of coordination metal complexes is most important technique, because of reducing chemical waste and reaction times in various chemical transformations. In the present study, some new Schiff base metal complexes of ZrO(II), VO(II), Cr(III), Mn(II), Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II) and Hg(II) derived from o-vanillin with 6-(trifluoro methoxy) benzothiozole-2-amine have been synthesised by using microwave radiation. Obtained coordination metal complexes were characterized with the help of several physical methods such as elemental analysis, FT-IR, molar conductance, electronic spectra, 1H-NMR, ESR, magnetic susceptibility, thermal, electrical conductivity and XRD analysis. All these data reveals the coordination number were 4, 5 and 6. Elemental analysis indicates that the complexes are of the type 1:1, 1:2 and 1:3 (M: L). The 1H-NMR spectral data attribute that the phenolic protons have been displaced during the complexation. The thermo gravimetric analysis shows that the presence of water molecule in the coordination metal complexes, which confirmed the loss of water molecule in the first step; followed by decomposition of ligand in the subsequent step. The ligand and coordination metal complexes were also tested against the Gram-positive bacteria; E-coli, Salmonella and Klebshilla, Gram-negative bacteria; S.aurioes and Streptococci.