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Paper Details

Synthesis, characterization and Thermodynamic studies of some organometallic complexes of bidentate Schiff- bases having N- and S- donor system

Basavaraj M. Kalshetty1*, T.P.Giraddi1, R.T.Pattar1, Ramesh.S. Gani2and M.B.Kalashetti3.

Journal Title:Journal of Chemical, Biological and physical sciences

The coordination complexes of metal ions like Cu(II), Zn(II), Ni(II), Co(II), Cd(II) with the Schiff base ligands LH2 have been synthesized at pH= 3-4, pH= 8-9 and pH= 10-11. The synthesized complexes have been characterized on the basis of elemental analysis, molar mass, spectroscopic studies including IR, NMR-spectra and thermodynamic parameters. Hence, the study reveals that the parent compounds A.B.C involved the donor groups COOH, -OH, SH, and Nitrogen atom. The ligand LH2 in metal complexes (Scheme 3 and Scheme 7) behaves as a monobasic bidantate OO- donor at pH=3-4 , suggesting the non-involvement of Sulphur and Nitrogen atoms present in 4-Amino-3-ethyl-5-mercapto-Triazole (AEMT). At pH=8-9 the ligand LH2 behaves as a dibasic tridentate OOS- donor (Scheme 4) suggesting the non-involvement of Nitrogen atom of (AEMT) in the metal complex compounds, sulphur makes coordination with metal ion first rather than Nitrogen atom. Because, of its electronic configuration. At pH= 8-9 the ligand with Copper metal ion also behaves as a dibasic tridentate OOS- donor, suggesting non-involvement of Nitrogen atom (Scheme 5) in the complex compound. The ligand LH2 behaves as dibasic tetra dentate OOSN- donor at pH=10-11, suggesting the coordination of (AEMT) Nitrogen atom and sulphur atom to the metal ions in the complex compounds.