Solution equilibria studies of complexes of divalent metal ions with 2-aminophenol and 3,4-dihydroxybenzoic acid

Chandra, Ivon Kusmijo and Angkawijaya, Artik Elisa and Santoso, Shella Permatasari and Ismadji, Suryadi Ismadji and Soetaredjo, Felycia Edi and Ju, Yi-Hsu (2015) Solution equilibria studies of complexes of divalent metal ions with 2-aminophenol and 3,4-dihydroxybenzoic acid. POLYHEDRON, 88. pp. 29-39. ISSN 0277–5387

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Abstract

The chelation abilities of 2-aminophenol and 3,4-dihydroxybenzoic acid with divalent metal ions (Cu 2+, Be 2+, Zn 2+,Ni 2+,Co 2+ and Mn 2+) in binary and ternary systems at 37 ± 0.1° C and an ionic strength of 0.15 mol dm 3 NaCl were systematically investigated by using the potentiometric titration method. The chelating abilities of these complexes were obtained by processing the titration data using the Hyperquad2008 program and the results are presented as stability constants. In a binary system, it was shown that metal complexation involving 3,4-dihydroxybenzoic acid (ligand D) is more stable than the one with 2-aminophenol (ligand A). The stability of the formed metal complexes, both in binary and ternary systems, decreases in the following order: Cu 2+>Be 2+ >Zn 2+ >Ni 2+ >Co 2+ >Mn 2+. The tendency of these metals and ligands to form binary or ternary complexes was also evaluated and discussed by cal- culating their D log KM and log X values. In addition, the distribution of complex species in these systems was graphically presented using the HySS2009 program. UV–Vis spectrophotometry was also performed to qualitatively verify the protonation of these ligands and to confirm the model of the complex formed.

Item Type: Article
Uncontrolled Keywords: 3,4-Dihydroxybenzoic acid 2-Aminophenol pH-potentiometry Hyperquad2008 UV–Vis spectrophotometry
Subjects: Engineering > Chemical Engineering
Divisions: Faculty of Engineering > Chemical Engineering Study Program
Depositing User: Felycia Edi Soetaredjo
Date Deposited: 17 Jul 2017 07:55
Last Modified: 22 May 2018 09:40
URI: http://repository.wima.ac.id/id/eprint/11257

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