Azo derivative of 2-thenoyltrifluoroacetone as a reagent for the photometric determination of copper(II)

被引：0

作者：

Aliyeva, RA ^{[1
]}

Chyragov, FM ^{[1
]}

Mahmudov, KT ^{[1
]}

机构：

[1] Baku State Univ, Dept Chem, Baku 370148, Azerbaijan

来源：

JOURNAL OF ANALYTICAL CHEMISTRY | 2005年 / 60卷 / 02期

关键词：

D O I：

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中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

1-(2-Thenoyl)-4-trifluoro-2-[2-hydroxy-3-sulfo-5-nitrophenylazo]butadione-1,3 (H2L) was synthesized from 2-thenoyltrifluoroacetone. The formation of a copper(II) complex of the synthesized reagent was studied in the presence and absence of 8-hydroxyquinoline (HR). Monoligand [Cu(HL)(2)] and mixed-ligand [Cu(HL)(2)HR] compounds were obtained at pH 4 and 3, respectively. The ratio of components in the monoligand and mixed-ligand compounds were 1 : 2 and 1 : 2 : 1, respectively. Beer's law was obeyed in the ranges of copper concentrations from 0.20 to 2.56 and from 0.25 to 2.56 mug/mL, respectively. The dissociation constants of the reagent were pK(1) = 4.25 +/- 0.01 and pK(2) = 8.20 +/- 0.01. The stability constants of [Cu(HL)(2)] and [Cu(HL)(2)HR] complexes were logK(1) = 4.96 +/- 0.03 and 4.92 +/- 0.01, respectively. A procedure was developed for the photometric determination of copper(II) in rocks.

引用

页码：137 / 140

页数：4