MULTIDENTATE LIGAND EXCHANGE KINETICS: REACTIONS OF AMINOCARBOXYLATO-FERRATE(Ⅲ) COMPLEXES WITH 4-(2-PYRIDYLAZO) RESORCINOL

作     者：NISHI GUPTA,PREM C.NIGAM 

作者机构：Department of Chemistry Indian Institute of Technology India Department of Chemistry Indian Institute of Technology India 

出 版 物：《无机化学学报》 (Chinese Journal of Inorganic Chemistry)

年 卷 期：1989年第3期

页      面：61-72页

核心收录：

学科分类：07[理学] 08[工学] 0815[工学-水利工程] 0701[理学-数学] 070101[理学-基础数学] 

主　　题：kinetic multidentate exchange aminocarboxylatoferrate(Ⅲ) Par 

摘      要：The kinetics and mechanism of ligand substitution reactions of nitrilotriacetatoiron（Ⅲ）, [Fe（NTA）], and N-（2-hydroxyethyl）-ethylenediaminetfiacetatoiron（Ⅲ）, [Fe（HEDTA）], complexes with 4-（2-pyridylazo） resorcinol （Par） has been investigated at pH = 9.0±0.02, I= 0.1mol·1-1（NaClO4）, and temp. = 25 ±0.1℃ and 30±0.1℃ respectively. The reaction has been studied spectrophotometrically at 496 nm. (λmaxof Fe（Par）2). In both reactions the final product was [Fe（Par）2]-. The values of second order rate constants for NTA and HEDTA exchange reactions are （10.0±0.8）×10～1·mol-1·s-1and （2.7± 0.1）×10-11·mol-1·s-1respectively. The reactions of NTA and HEDTA exchange were studied in the pH range 6-9.5 and 7-10.85 respectively. The rate of reacton of [Fe（NTA）] with HPar-first increases with pH and then levels off. However, in the case of [Fe（HEDTA）] reaction, the rate increases monotonically with increase of pH in the specified range. The reverse reactions between [Fe（Par）2