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Cobalt(II) and Nickel(II) Compounds with 2-Thiobarbituric Acid
Russian Journal of Inorganic Chemistry ( IF 1.8 ) Pub Date : 2020-09-10 , DOI: 10.1134/s0036023620080082
A. P. Lakeev , N. M. Korotchenko

Abstract

Interaction between the systems containing cobalt(II) or nickel(II) chlorides and 2-thiobarbituric acid (C4H4N2O2S, H2L) was examined by spectrophotometry and pH-metry at pH < 4, I = 0.1 (NaCl) and T = 20°C. The compositions and the overall stability constants (log β11) of protonated complex species were determined: [CoHL]+ (3.69 ± 0.04), [NiHL]+ (3.68 ± 0.08), and [M(HL)2]. The compositions of the Co(C4H3N2O2S)2 · 4H2O and Ni(C4H3N2O2S)2 · 5H2O salts isolated from the studied systems were confirmed by different physicochemical methods; their solubility constants (log KS) were calculated to be –12.82 ± 0.22 and –12.30 ± 0.10, respectively. A spectrophotometric technique was developed for determining thiobarbiturate ion in aqueous solutions. This technique is based on the absorbance of iron(III) thiobarbiturate complex [FeL]+ and can be recommended for analytical chemists and pharmacists.



中文翻译:

含2-硫代巴比妥酸的钴(II)和镍(II)化合物

摘要

含钴(II)或镍(II)氯化物和2-硫代巴比妥酸(C系统之间的相互作用4 ħ 4 Ñ 2 ö 2 S,H 2是在pH <4通过分光光度法和pH metry检查L),= 0.1(NaCl)和T = 20°C。的组合物和整体稳定性常数(日志β 11质子化复合物种)测定:[科尔] +(3.69±0.04),[NIHL] +(3.68±0.08),和[M(HL)2 ]。Co(C 4 H 3 N 2 O 2 S)2 ·4H的组成从研究体系中分离出2 O和Ni(C 4 H 3 N 2 O 2 S)2 ·5H 2 O盐,用不同的理化方法进行了确认;其溶解度常数(log  K S)经计算分别为–12.82±0.22和–12.30±0.10。开发了用于测定水溶液中硫代巴比妥酸根离子的分光光度技术。该技术基于硫代巴比妥酸铁(III)铁(FeL)+的吸光度,可推荐给分析化学家和药剂师。

更新日期:2020-09-11
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