Coordination compounds of chromium(III) with different complexones and citric acid in aqueous solutions

被引:0
作者
V. I. Kornev
G. A. Mikryukova
机构
[1] Udmurt State University,
来源
Russian Journal of Coordination Chemistry | 2004年 / 30卷
关键词
Physical Chemistry; Aqueous Solution; Chromium; Edta; Inorganic Chemistry;
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摘要
A spectrophotometric study of heteroligand chromium(III) complexes with iminodiacetic (H2Ida), N-methyliminodiacetic (H2Mida), N-(β-hydroxyethyl)iminodiacetic (H2Heida), nitrilotriacetic (H3Nta), ethylenediaminetetraacetic (H4Edta), and citric acids (H4Cit) showed that complexation in ternary systems depends on the concentrations of the reagents and the pH of the medium. The resulting complexes were [Cr(HIda)(H2Cit)], [Cr(HMida)(H2Cit)], [Cr(HHeida)(H2Cit)], [Cr(HHeida)(HCit)]−, [Cr(HNta)(H2Cit)]−, [Cr(HNta)(HCit)]2−, [Cr(Nta)(HCit)]3−, [Cr(HEdta)(HCit)]3−, and [Cr(Edta)(HCit)]4−. The logarithms of their stability constants are 41.97 ± 0.47, 43.54 ± 0.62, 42.32 ± 0.62, 36.34 ± 0.26, 43.70 ± 0.25, 39.75 ± 0.45, 32.93 ± 1.56, 46.46 ± 0.80, and 41.71 ± 0.81 , respectively (I = 0.1 (NaClO 4)).
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页码:895 / 899
页数:4
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