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Complex Formation Reactions of Divinyltin(IV) Complexes with Amino Acids, Peptides, Dicarboxylic acids and Related Compounds

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Complex formation equilibria of divinyltin(IV) with amino acids, peptides, and dicarboxylic acids have been investigated. Stoichiometry and stability constants for the complexes formed were determined at 25°C and ionic strength 0.1 M NaNO3. The results showed the formation of ML, MLH, and ML2 (organotin : ligand : hydrogen) complexes with amino acids. Peptides form ML complexes and the corresponding deprotonated amide species MLH−1. In the latter species the binding with divinyltin(IV) occurs through the terminal amino group, carboxylate oxygen, and the amide nitrogen atoms (, NH2). The results showed the formation of ML and ML2 complexes with dicarboxylic acids. The concentration distribution of the complexes in solution was evaluated. The bonding sites of the divinyltin(IV) complex in solid state with oxalic acid was investigated by means of elemental analyses, FTIR, and mass spectra. Non-isothermal decomposition of the above complex has been studied and the result was statistically analyzed. The main steps were identified for the thermal decomposition reaction and each step proved to be a first order reaction. The kinetic parameters E a and A were calculated for each step in the reaction. The thermodynamic functions H, G, and S* were calculated for each step of the reaction.
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Keywords: Amino acid; Dicarboxylic acids; Divinyltin(IV) complexes; Equilibrium studies; FTIR; Peptide; Thermal analysis (TGA & DTA)

Document Type: Research Article

Publication date: June 15, 2003

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