Protolytic and complexing properties of some isomeric aromatic amino acids in aqueous solution

Мұқаба

Дәйексөз келтіру

Толық мәтін

Ашық рұқсат Ашық рұқсат
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Рұқсат жабық Тек жазылушылар үшін

Аннотация

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.

Авторлар туралы

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

Хат алмасуға жауапты Автор.
Email: gennady.zharkov@mail.ru
st. Mira, 19, Ekaterinburg, 620002 Russia

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