INVESTIGATION AND OPTIMIZATION OF COMPLEXATION OF COBALT IONS WITH DIHYDROQUERCETIN IN AQUEOUS SOLUTIONS

  • Елена (Elena) Владимировна (Vladimirovna) Столповская (Stolpovskaya) A.E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences Email: stel@irioch.irk.ru
  • Наталья (Natal'ya) Николаевна (Nikolaevna) Трофимова (Trofimova) A.E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences Email: natrof@irioch.irk.ru
  • Василий (Vasiliy) Анатольевич (Anatol'evich) Бабкин (Babkin) A.E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences Email: babkin@irioch.irk.ru
  • Роман (Roman) Георгиевич (Georgievich) Житов (Zhitov) Irkutsk State University Email: zhitovroman@gmail.com
DOI_disc_logo https://doi.org/10.14258/jcprm.2019014257
Keywords: dihydroquercetin, flavonoids, complex compounds, cobalt ions, optimization, yield of the product

Abstract

We continue to study the reactions of complexation of biogenic metal ions with flavonoid dihydroquercetin (DHQ). The interaction of Co2+ ions with DHQ in aqueous solutions has been studied.

It is established that complexes with different stoichiometry are formed at different pH values of the solution. Changing the pH of the solution from 6.0 to 7.0 leads to the formation of compounds 1–3 with a metal: flavonoid ligand (Met: L) ratio from 1: 2 at pH 6.0 (1) via 2: 3 at pH 6.4 -6.7 (2) to 1: 1 at pH 6.8-7.0 (3).

Using the method of thermogravimetry with elemental analysis data, the most probable composition of compounds was established with the determination of the amount of bound water: [CoL2(H2O)4] for 1, [Co2L3(OH)(H2O)4] for 2 and [CoL(OH)(H2O)2] for 3.

The conditions for the complexation of Co2+ ions with dihydroquercetin in aqueous solutions to form compound 2, optimized for the yield of the product, are proposed. pH of the solution is 6.7, the reaction time is 15 minutes, the temperature of the reaction solution is 90 °C, molar ratio of the initial reagents DHQ:Co2+ is 1: 1.5, initial concentrations are 0,020 M DHQ and 0,030 M Co2+, the source of Co2+ is CoSO4∙7H2O. The yield of the product is 81.8 %.

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Author Biographies

Елена (Elena) Владимировна (Vladimirovna) Столповская (Stolpovskaya), A.E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences

младший научный сотрудник  лаборатории химии древесины, кандидат химических наук

Наталья (Natal'ya) Николаевна (Nikolaevna) Трофимова (Trofimova), A.E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences

начальник отдела аспирантуры, кандидат химических наук

Василий (Vasiliy) Анатольевич (Anatol'evich) Бабкин (Babkin), A.E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch, Russian Academy of Sciences

заведующий лабораторией химии древесины, доктор химических наук, профессор

Роман (Roman) Георгиевич (Georgievich) Житов (Zhitov), Irkutsk State University

научный сотрудник лаборатории полимеризационных процессов и органического синтеза, кандидат химических наук

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комплексных соединений Со2+ с дигидрокверцетином
Published
2019-03-06
How to Cite
1. Столповская (Stolpovskaya)Е. (Elena) В. (Vladimirovna), Трофимова (Trofimova)Н. (Natal’ya) Н. (Nikolaevna), Бабкин (Babkin)В. (Vasiliy) А. (Anatol’evich), Житов (Zhitov)Р. (Roman) Г. (Georgievich) INVESTIGATION AND OPTIMIZATION OF COMPLEXATION OF COBALT IONS WITH DIHYDROQUERCETIN IN AQUEOUS SOLUTIONS // chemistry of plant raw material, 2019. № 1. P. 95-104. URL: http://journal.asu.ru/cw/article/view/4257.
Issue
No 1 (2019)
Section
Low-molecular weight compounds

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