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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
Abstract


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.

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