Publication: Potentiometric investigations of some catechol derivatives of scandium
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Türkel, Naciye
Özer, Ulviye
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Pleiades Publishing
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Abstract
The equilibrium reactions of scandium(III) with some triprotic catechol derivatives (H3L) were studied. The selected ligands that are 2,3-dihydroxybenzoic acid (2,3-DHBA), 3,4-dihydroxybenzoic acid (3,4-DHBA), 3.4-dihydroxyhydrocinnamic acid (3,4-DHHCA), and 3,4-dihydroxyphenylacetic acid (3,4-DHPA) were investigated in aqueous solution by means of potentiometry in 0.1 M ionic medium at 25 degrees C. The stability constants are reported for the ScL and ScL(H2L)(-) mononuclear complexes. 2,3-DHBA can bind to Sc3+ ion strongly and the salicylate mode (COO-, O-) is effective over the acidic pH range. But in higher pH range, 3,4-DHBA, 3,4-DHHCA, and 3,4-DHPA act more efficiently through catecholate groups (O-, O-).
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Keywords
Chemistry, Acid dissociation-constants, Salicylic-acid, Hydroxyaromatic ligands, Dihydroxybenzoic acids, Aqueous-solution, Complexes, Stabilities, Aluminum, Yttrium(III), Equilibria, Carboxylic acids, Complexation, Derivatives, Molecular structure, Ph effects, Scandium, Solubility, Catechol derivatives, Ionic medium, Potentiometric investigations, Stability constants, Alcohols
Citation
Türkel, N. ve Özer, U. (2005). "Potentiometric investigations of some catechol derivatives of scandium". Russian Journal of Coordination Chemistry, 31(3), 213-217.