Chandra, Ivon Kusmijo, Angkawijaya, Artik Elisa, Santoso, Shella Permatasari, Ismadji, Suryadi Ismadji, 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.ukwms.ac.id/id/eprint/11257 |
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