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Vol. 25 No. 3 (2013): Vol 25 Issue 3

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Synthesis and Characterization of Metal Complexes with Mercaptosuccinic Acid and Hydrazine as Ligands

https://doi.org/10.14233/ajchem.2013.13118
S. Devipriya
Department of Chemistry, Government College of Technology, Coimbatore-641 013, India
S. Vairam
Department of Chemistry, Government College of Technology, Coimbatore-641 013, India

Corresponding Author(s) : S. Vairam

vamshen@yahoo.com

Asian Journal of Chemistry, Vol. 25 No. 3 (2013): Vol 25 Issue 3

Abstract

Reaction of hydrazine and mercaptosuccinic acid with metal ion forms complexes with general formula, [M(N2H4)2{CH2(COO)CH(COOH) (S)}]·(H2O)n where n = 1 when M = Hg(II), Pb(II), n = 2 when M = Zn(II), Cd(II) and n = 3 when M = Co(II) at pH 4. The acid shows dianionic nature showing deprotonation in one of the -COOH groups and in -SH group in these complexes. The complexes have been characterized by analytical, IR and UV-visible spectroscopy and thermal studies. IR spectra show N-N stretching frequencies in the region 985-935 cm-1 indicates the nature of hydrazine in the complexes. Simultaneous TG-DTA analysis indicates that hydrazine complexes of Co(II), Cd(II), Pb(II) undergo endothermic dehydration in the range of 90-105 ºC followed by exothermic dehydrazination in the temperature range, 238-282 ºC and exothermic decomposition in the range of 290-467 ºC to the respective metal sulfide/sulfates as the end product. Zn complex shows a different thermal degradation pattern resulting in zinc oxide as an end product. SEM images and XRD pattern of the end products show that they are of nano size. X-Ray powder diffraction patterns show isomorphism among the complexes with similar molecular formulae. The kinetic parameters of the complexes have been computed by Coats-Redfern equation.

Keywords

Mercaptosuccinicacid Hydrazine IR TG-DTA SEM
Devipriya, S., & Vairam, S. (2012). Synthesis and Characterization of Metal Complexes with Mercaptosuccinic Acid and Hydrazine as Ligands. Asian Journal of Chemistry, 25(3), 1521–1524. https://doi.org/10.14233/ajchem.2013.13118
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