Protolytic and complexing properties of some isomeric aromatic amino acids in aqueous solution
- 作者: Zharkov G.P.1,2, Yunusov N.N.1, Petrova Y.S.1, Pestov A.V.1,3, Neudachina L.K.1
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隶属关系:
- Ural Federal University, the first President of Russia B.N. Yeltsin
- Ural Research Institute of Metrology, branch of the Federal State Unitary Enterprise “VNIIM named after D. Mendeleev”
- Institute of Organic Synthesis, Russian Academy of Sciences, AND I. Postovsky Ural Branch of the Russian Academy of Sciences
- 期: 卷 70, 编号 6 (2025)
- 页面: 836-846
- 栏目: ФИЗИКОХИМИЯ РАСТВОРОВ
- URL: https://journal-vniispk.ru/0044-457X/article/view/306800
- DOI: https://doi.org/10.31857/S0044457X25060123
- EDN: https://elibrary.ru/ickyfg
- ID: 306800
如何引用文章
详细
The protolytic and complexation properties of some isomeric aromatic amino acids in aqueous solution were studied by a combination of pH-potentiometric and UV-spectrophotometric titration methods at I = 0.1 mol/dm3 (KCl/NaClO4) and t = (25 ± 1)°С. The acid dissociation constants of ammonium (pKa0) and carboxyl groups (pKa1) in the structure of isomeric benzene-carboxylic amino acids were determined: anthranilic acid (L1), meta-aminobenzoic acid (L2) and para-aminobenzoic acid (L3); ammonium groups (pKa1) in the structure of isomeric benzenesulfonic amino acids: orthanilic acid (L4), methanilic acid (L5), sulfanilic acid (L6). It is shown that the basicity of the amino group in the structure of the reagents decreases in the series of isomers: meta-, para-, ortho-isomer. Despite the fact that ortho-isomers are characterized by lower basicity of the amino group, it is shown that their metal complexes have the highest stability. It was found that anthranilic acid exhibits selective properties towards copper(II) ions, and orthanilic acid – towards silver(I) ions. The spectral characteristics of metal complexes of isomeric benzenesulfonic amino acids with transition metal ions: silver(I), copper(II), nickel(II) and cobalt(II) have been determined.
作者简介
G. Zharkov
Ural Federal University, the first President of Russia B.N. Yeltsin; Ural Research Institute of Metrology, branch of the Federal State Unitary Enterprise “VNIIM named after D. Mendeleev”
Email: gennady.zharkov@mail.ru
st. Mira, 19, Ekaterinburg, 620002 Russia; st. Krasnoarmeyskaya, 4, Ekaterinburg, 620075 Russia
N. Yunusov
Ural Federal University, the first President of Russia B.N. Yeltsin
Email: gennady.zharkov@mail.ru
st. Mira, 19, Ekaterinburg, 620002 Russia
Yu. Petrova
Ural Federal University, the first President of Russia B.N. Yeltsin
Email: gennady.zharkov@mail.ru
st. Mira, 19, Ekaterinburg, 620002 Russia
A. Pestov
Ural Federal University, the first President of Russia B.N. Yeltsin; Institute of Organic Synthesis, Russian Academy of Sciences, AND I. Postovsky Ural Branch of the Russian Academy of Sciences
Email: gennady.zharkov@mail.ru
st. Mira, 19, Ekaterinburg, 620002 Russia; st. Akademicheskaya, 20, Ekaterinburg, 620990 Russia
L. Neudachina
Ural Federal University, the first President of Russia B.N. Yeltsin
编辑信件的主要联系方式.
Email: gennady.zharkov@mail.ru
st. Mira, 19, Ekaterinburg, 620002 Russia
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