Equilibrium Studies on Chromium(III) Complexes of Salicylic Acid and Salicylic Acid Derivatives in Aqueous Solution

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概要

• 論文の詳細を見る

• The complexes of chromium (III) ion formed by salicylic acid, SA (H_2L), and its derivatives (H_2L) : 5-nitrosalicylic acid (5-NSA), 5-sulphosalicylic acid (5-SSA) were investigated by means of potentiometry and spectroscopy, at 25℃ and in ionic strength of 0.1 M KNO_3 and 0.1 M KC1, respectively. Over the acidic pH range, the coordination of Cr (III) ion to SA and its derivatives in 1 : 1 mole ratio occurs, CrL^+ type complex is formed. In the excess of ligand, the coordination of the second ligand molecule is somewhat hindered ; as a result CrL (HL) type complex occurs. Their existences were verified and their formation constants were determined. At near neutral pH, CrL (OH) and CrL (HL) (OH)^- type hydroxo complexes formed by hydrolytic equilibria and their formation constants were also defined. The stabilities of Cr (III) complexes of SA and its derivatives decrease in the following order : SA>5-SSA>5-NSA. The formation constants of Cr (III) complexes of SA and its derivatives are in comparable ranges with the corresponding complexes of the 2, x-dihydroxybenzoic acid (2, x-DHBA) of Cr (III) ion. The stabilities of SA complexes for V (IV), Cr (III) and Fe (III) ions that have similar ionic radii, increase in the order VOL<CrL^+<FeL^+. It is worthwhile noting that the binding ability of Cr (III) to salicylate ion is four orders of magnitude higher than to transferin, which is a blood serum protein and is associated with insulin action.

• 公益社団法人日本薬学会の論文
• 2004-11-01

著者

• Aksoy Mehmet

  Department Of Chemistry Faculty Of Arts And Science Uludag University

• Aksoy Mehmet

  Department Of Chemistry Arts And Science Faculty Uludag University

• OZER Ulviye

  Department of Chemistry, Faculty of Arts and Sciences, Uludag University

• Ozer Ulviye

  Department Of Chemistry Faculty Of Arts And Science Uludag University

• Ozer Ulviye

  Department Of Chemistry Arts And Science Faculty Uludag University

関連論文

• Potentiometric and Spectroscopic Studies on Aluminium(III) Complexes of Some Catechol Derivatives
• Formation Constants of Chromium(III), Scandium(III) and Yttrium(III) Complexes of Some Hydroxy Naphthoic Acids
• Complexes of Chromium(III) with 2,3-Dihydroxynaphthalene-6-sulfonic Acid and 4,5-Dihydroxynaphthalene-2,7-disulfonic Acid in Aqueous Solution
• Equilibrium Studies on Chromium(III) Complexes of Salicylic Acid and Salicylic Acid Derivatives in Aqueous Solution
• Salicylic Acid Derivatives Form Stable Complexes with Scandium(III) Ion in Aqueous Solution

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