Complexation of copper(II) with azo derivatives of benzoylacetone

被引：0
|
作者：
S. R. Gadzhieva
F. M. Chyragov
K. T. Makhmudov
机构：
[1] Baku State University,Department of Chemistry
来源：
Journal of Analytical Chemistry | 2007年 / 62卷
关键词：
Tartaric Acid; Formation Constant; Conductometric Titration; Photometric Determination; Benzoylacetone;
D O I：
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中图分类号：
学科分类号：
摘要：
1-Phenyl-2-[2-hydroxy-3-sulfo-5-nitrophenylazo]butadione-1,3 (H2L) was synthesized from benzoylacetone. The dissociation constants of the reagent were determined (pK1 = 4.98 ± 0.03 and pK2 = 8.53 ± 0.01). Stability constants of some metal complexes with this reagent were determined by potentiometric and conductometric titrations. The stability of these complexes decreased in the following order: Fe > Cu > UO2 > Ni > Co > Zn > Cd > Mn > Mg > Ca. The copper(II) H2L complex with a stoichiometry of 1: 2 was studied by photometry. ε = 1.4 × 104, Beer is law was obeyed in the copper concentration range from 0.25 to 3.07 μg/mL. The effect of foreign ions and masking agents on complexation was studied. A procedure for the photometric determination of copper(II) in seawater was developed.
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页码：1028 / 1031
页数：3
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