Synthesis of Ultrapure Copper Chelates
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hesis of Ultrapure Copper Chelates N. N. Kostyuka,* and T. A. Dicka a Belarusian
State University, Minsk, 220030 Belarus *e-mail: [email protected]
Received June 26, 2020; revised June 26, 2020; accepted July 16, 2020
Abstract—Various methods for the synthesis of copper(II) chelates (β-diketonates and ethylenediaminetetraacetates) were considered. The most effective methods for the preparation of ultrapure copper(II) chelates based on acid-base transformations and electrochemical synthesis have been revealed by means of the analytical treatment of the literature and experimental data. Ultrapure copper(II) bis(acetylacetonate), bis(benzoylacetonate), bis(dibenzoylmethanate), bis(trifluoroacetylacetonate), bis(pivaloyltrifluoroacetonate), ethylenediaminetetraacetate, and also copper(II) sodium ethylenediaminetetraacetate were synthesized. The purity of the chelates was estimated by the mass spectrometry method. Keywords: chelate, copper β-diketonate, copper ethylenediaminetetraacetate, synthesis of chelates, electrochemical synthesis of copper chelates, ultrapure compounds
DOI: 10.1134/S1070363220110195 Copper(II) bis(acetylacetonate) and ethylenediaminetetraacetate are highly-demanded chemical compounds. Copper(II) bis(acetylacetonate) is used in modern technologies of large-scale production of metal products with a modified surface by chemical vapor deposition (CVD process) [1–6]. Copper(II) sodium ethylenediaminotetraacetate is used in industrial animal husbandry as a veterinary drug and feed additive to prevent animal diseases with hypomicroelementosis [7–10]. The widespread use of these compounds is caused by both their high efficiency and low cost. The transition to modern high technologies places special demands on chemical compounds, first of all, on their purity. The purity of raw materials— precursors of chemical processes, veterinary and medical preparations—becomes one of the main parameters that, along with the supramolecular structure, determine their highly demanded functional properties. Not just chemical compounds are in demand, but ultrapure substances. Production of ultrapure substances is a specific area of chemistry associated with the use of special methods for the purification of chemical compounds [11, 12]. As a rule, obtaining particularly pure substances involves expensive manipulations with rather low yields and a complex hardware design [11, 12]. Before the intensive development of nanochemistry, nanophysics, and nanomaterial science, there was no need for large-
scale production of highly pure chemical compounds. Currently, the demand for them is steadily increasing [3]. There is a need for new effective methods for the synthesis of ultrapure substances that can be scaled up to at least the level of low-tonnage production. An alternative solution to this problem can be a more careful choice of methods and techniques of synthetic chemistry for the direct production of ultrapure substances. No works related to the study of preparativesynthetic methods for obtaining ultrapure copper chelat
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