Complex Formation of Silver(I) with 1,2,3-Benzotriazole: Protonization Constants of 1,2,3-Benzotriazole

IF 0.7 Q4 CHEMISTRY, MULTIDISCIPLINARY

Moscow University Chemistry Bulletin Pub Date : 2023-06-07 DOI:10.3103/S0027131423030100

A. S. Samadov, A. F. Stepnova, E. F. Faizullozoda, A. N. Kuzmenko, O. N. Plakhotnaya, A. V. Kuzin, K. J. Suyarov, K. Ya. Khuseinov

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Abstract

The acid–base properties of 1,2,3-benzotriazole (Bta) at 25°C and I = 0.1 mol/L KCl are studied in an aqueous solution by the pH-metric method. It is found that in the strongly acidic region of the solution, one of the two nitrogen atoms of the pyridine type of the Bta triazole rings undergoes protonation, and at high pH values, hydrogen abstraction occurs from the NH fragment of the molecule. The obtained values of the protonization constants of 1,2,3-benzotriazole log K₁ and log K₂ are 8.27 and 0.65, respectively. Using the potential of a silver electrode, the equilibria of silver(I) complex formation with 1,2,3-benzotriazole are studied. The data obtained indicate that Ag⁺ replaces the hydrogen ions of the ligand molecule and forms AgBta and \({\text{AgBta}}_{2}^{ - }\) complexes with the stability constants log β₁ = 8.50 (AgBta) and log β₂ = 12.65 (\({\text{AgBta}}_{2}^{ - }\)).

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银(I)与1,2,3-苯并三唑络合物的形成:1,2,3-苯并三唑的质子化常数

用ph法研究了1,2,3-苯并三唑(Bta)在25℃和I = 0.1 mol/L KCl条件下的酸碱性质。发现在溶液的强酸性区域，Bta三唑环的吡啶型两个氮原子中的一个发生质子化，在高pH值下，分子的NH片段发生抽氢。得到1,2,3-苯并三唑的质子化常数logk1和logk2分别为8.27和0.65。利用银电极电位，研究了银(I)与1,2,3-苯并三唑形成络合物的平衡。得到的数据表明，Ag+取代配体分子中的氢离子，形成AgBta和\({\text{AgBta}}_{2}^{ - }\)配合物，稳定常数分别为log β1 = 8.50 (AgBta)和log β2 = 12.65 (\({\text{AgBta}}_{2}^{ - }\))。

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来源期刊

Moscow University Chemistry Bulletin CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

1.30

自引率

14.30%

发文量

期刊介绍： Moscow University Chemistry Bulletin is a journal that publishes review articles, original research articles, and short communications on various areas of basic and applied research in chemistry, including medical chemistry and pharmacology.