Equilibrium study of complex formation among trivalent metals, glycine peptides and phenolates in aqueous solution

Angkawijaya, Artik Elisa and Santoso, Shella Permatasari and Soetaredjo, Felycia Edi and Ismadji, Suryadi and Yi Hsu, Ju (2015) Equilibrium study of complex formation among trivalent metals, glycine peptides and phenolates in aqueous solution. Journal of Solution Chemistry, 44 (11). pp. 2129-2145. ISSN 0095-9782

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Official URL: https://link.springer.com/article/10.1007/s10953-0...

Abstract

The stability of binary and mixed-ligand complexes among trivalent transition metal ions (chromium and iron), glycine peptides (glycylglycine and glycylglycylglycine) and phenolates (ferulic acid and gallic acid) were studied by using pH-potentiometric titration in aqueous solution at 298.15 K and ionic strength of 0.15 mol�dm-3 NaNO3. The complexation model for each system was obtained by processing the potentiometric titration data using the HYPERQUAD2008 program. The stability constant trend of complexes in both systems and the contributions of deprotonated or protonated amide peptides to the stability of the complexes is discussed. The stability of the mixed-ligand complexes relative to their corresponding binary complexes was also investigated by calculating the Dlog10 K parameter of each system. In addition, the Gibbs energies of reaction (DrG) obtained from the Gaussian modeling program with B3LYP/6-31?G(d) basis set were used to verify the contributing binding sites of the ligands and to predict the structures of the M–L complexes

Item Type: Article
Uncontrolled Keywords: Solution equilibria Peptides Phenolates Potentiometry Gaussian
Subjects: Engineering > Chemical Engineering
Divisions: Faculty of Engineering > Chemical Engineering Study Program
Depositing User: Suryadi. Ismadji
Date Deposited: 11 Jan 2016 04:31
Last Modified: 19 Jul 2018 08:47
URI: http://repository.wima.ac.id/id/eprint/4168

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