Protolytic and complexing properties of N-(2-hydroxyethyl)-iminodipropionic acid in aqueous solution

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By the method of alkalimetric titration of aqueous solutions with pH-potentiometric indication at I = 0.1 mol/dm3 (KCl/KNO3) and t = 25 ± 1°C the acid dissociation constants of functional groups in the composition of a new reagent N-(2-hydroxyethyl)iminodipropionic acid pKa0 = 2.87 ± 0.02, pKa1 = 4.00 ± 0.02 and pKa2 = 9.25 ± 0.01. The complexation of the reagent with transition metal ions was studied. It is shown that N-functionalization of iminodipropionic acid by introduction of 2-hydroxyethyl substituent leads to a significant decrease in stability of complexes with copper(II) and nickel(II) ions, with cobalt(II), zinc(II) and cadmium(II) ions the stability of complexes does not significantly increase. Relatively high stability is characterized by complexes with silver(I) ions. Based on the obtained data, assumptions about the structure of the studied complexes were made.

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作者简介

G. Zharkov

Ural Federal University, the first President of Russia B.N. Yeltsin; Ural Research Institute of Metrolgy, branch of the Federal State Unitary Enterprise “VNIIM named after. DI. Mendeleev”

编辑信件的主要联系方式.
Email: gennady.zharkov@mail.ru
俄罗斯联邦, st. Mira, 19, Yekaterinburg, 620002; st. Krasnoarmeyskaya, 4, Ekaterinburg, 620075

O. Filimonova

Ural Federal University, the first President of Russia B.N. Yeltsin

Email: gennady.zharkov@mail.ru
俄罗斯联邦, st. Mira, 19, Yekaterinburg, 620002

Yu. Petrova

Ural Federal University, the first President of Russia B.N. Yeltsin

Email: gennady.zharkov@mail.ru
俄罗斯联邦, st. Mira, 19, Yekaterinburg, 620002

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
俄罗斯联邦, st. Mira, 19, Yekaterinburg, 620002; st. Akademicheskaya, 20, Yekaterinburg, 620990

L. Neudachina

Ural Federal University, the first President of Russia B.N. Yeltsin

Email: gennady.zharkov@mail.ru
俄罗斯联邦, st. Mira, 19, Yekaterinburg, 620002

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