Studying the Complexation of Mercury(II) with 1-Phenyl-2,3-dimethylpyrazoline-5-thione in 1.0 mol/L HNO3

IF 0.8 4区化学 Q4 CHEMISTRY, PHYSICAL

Russian Journal of Physical Chemistry A Pub Date : 2026-03-23 DOI:10.1134/S0036024425703339

N. S. Beknazarova, J. O. Shoalifov

{"title":"Studying the Complexation of Mercury(II) with 1-Phenyl-2,3-dimethylpyrazoline-5-thione in 1.0 mol/L HNO3","authors":"N. S. Beknazarova, J. O. Shoalifov","doi":"10.1134/S0036024425703339","DOIUrl":null,"url":null,"abstract":"The complexation of mercury(II) contained in Hg(NO3)2⋅2H2O with 1-phenyl-2,3-dimethylpyrazoline-5-thione (PDPT) in 1.0 mol/L HNO3 at 273–338 K is studied by potentiometric titration using a redox electrode based on PDPT and the oxidized form of it. It is found that four complex species are formed in the studied system; they have the following compositions: [HgL(H2O)3]2+, [HgL2(H2O)2]2+, [HgL3(H2O)]2+, and [HgL4]2+. For each complex species, stability constants are found and refined using the Bjerrum method. It is shown that the stepwise stability constants of mercury(II)–PDPT complexes decrease with an increase in temperature and the number of coordinated ligand molecules in the inner sphere of the complex. Using the stability constants, the thermodynamic functions of the complexation process are calculated. Distribution curves for all complex species formed in the Hg(II)–PDPT–1.0 mol/L HNO3 system at temperatures of 273–338 K are calculated. The distribution diagrams of mercury(II)–PDPT complexes as a function of organic ligand concentration are analyzed to identify the region of dominance of all complex species formed in the studied system and develop optimum procedures for synthesizing novel mercury(II) coordination compounds.","PeriodicalId":767,"journal":{"name":"Russian Journal of Physical Chemistry A","volume":"100 2","pages":"159 - 164"},"PeriodicalIF":0.8000,"publicationDate":"2026-03-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Russian Journal of Physical Chemistry A","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1134/S0036024425703339","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}

引用次数: 0

Abstract

The complexation of mercury(II) contained in Hg(NO₃)₂⋅2H₂O with 1-phenyl-2,3-dimethylpyrazoline-5-thione (PDPT) in 1.0 mol/L HNO₃ at 273–338 K is studied by potentiometric titration using a redox electrode based on PDPT and the oxidized form of it. It is found that four complex species are formed in the studied system; they have the following compositions: [HgL(H₂O)₃]²⁺, [HgL₂(H₂O)₂]²⁺, [HgL₃(H₂O)]²⁺, and [HgL₄]²⁺. For each complex species, stability constants are found and refined using the Bjerrum method. It is shown that the stepwise stability constants of mercury(II)–PDPT complexes decrease with an increase in temperature and the number of coordinated ligand molecules in the inner sphere of the complex. Using the stability constants, the thermodynamic functions of the complexation process are calculated. Distribution curves for all complex species formed in the Hg(II)–PDPT–1.0 mol/L HNO₃ system at temperatures of 273–338 K are calculated. The distribution diagrams of mercury(II)–PDPT complexes as a function of organic ligand concentration are analyzed to identify the region of dominance of all complex species formed in the studied system and develop optimum procedures for synthesizing novel mercury(II) coordination compounds.

Abstract Image

查看原文本刊更多论文

汞（II）与1-苯基-2,3-二甲基吡唑啉-5-硫酮在1.0 mol/L HNO3中的络合作用研究

采用电位滴定法研究了Hg(NO3)2·2H2O中汞（II）与1-苯基-2,3-二甲基吡唑啉-5-硫酮（PDPT）在1.0 mol/L HNO3溶液中273 ~ 338 K的络合反应。研究发现，在研究系统中形成了四种复杂的物种；它们具有以下组成：[HgL(H2O)3]2+, [HgL2(H2O)2]2+, [HgL3(H2O)]2+和[HgL4]2+。对于每一个复杂的物种，稳定常数被发现和细化使用Bjerrum方法。结果表明，汞(II) -PDPT配合物的稳定性常数随着温度的升高和配合物内球配位分子数量的增加而逐步降低。利用稳定性常数，计算了络合过程的热力学函数。计算了Hg(II) -PDPT-1.0 mol/L HNO3体系在273 ~ 338 K温度下形成的所有复杂物质的分布曲线。分析了汞(II) -PDPT配合物随有机配体浓度的分布图，以确定在所研究体系中形成的所有配合物的优势区，并制定了合成新型汞（II）配位化合物的最佳工艺。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Russian Journal of Physical Chemistry A 化学-物理化学

CiteScore

1.20

自引率

14.30%

发文量

376

审稿时长

5.1 months

期刊介绍： Russian Journal of Physical Chemistry A. Focus on Chemistry (Zhurnal Fizicheskoi Khimii), founded in 1930, offers a comprehensive review of theoretical and experimental research from the Russian Academy of Sciences, leading research and academic centers from Russia and from all over the world. Articles are devoted to chemical thermodynamics and thermochemistry, biophysical chemistry, photochemistry and magnetochemistry, materials structure, quantum chemistry, physical chemistry of nanomaterials and solutions, surface phenomena and adsorption, and methods and techniques of physicochemical studies.