Mixed-ligand complexes of copper (II) with ditiolfenols and heterocyclic diamines

Kuliev, K. A.; Плотникова, С. Е.; Горбунова, Е. М.; Taranova, A. N.

doi:10.20914/2310-1202-2017-1-248-256

Cited by 4 publications

(3 citation statements)

References 1 publication

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“…Для определения концентрации окрашенных растворов широко используется фотометрический метод [11,12]. Концентрацию бихромат-иона рассчитывали по значению оптической плотности.…”

Section: материалы и методыunclassified

Prospects for the use of liquid waste from the production of sodium carbonate as a coolant based on the ternary system CaCl2-K2Cr2O7-H2O

Плотникова

Peregudov

Горбунова

et al. 2020

Vestn. Voronež. gos. univ. inž. tehnol.

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Currently, the urgent problem is the secondary use of distillation liquid - a waste product from the production of sodium carbonate, which is an aqueous solution containing about 10 % calcium chloride and a small amount of other salts. It is proposed to use a solution based on a distiller liquid as a coolant in a heat exchange system in the production of soda. The introduction of potassium dichromate into the system creates an inhibitory effect and prevents pipe corrosion. To study phase equilibria in the CaCl2 - K2Cr2O7 - H2O system, state diagrams were constructed at temperatures of 20, 3, and -7°C. With decreasing temperature, the homogeneous region noticeably decreases and shifts to the CaCl2 - H2O axis. The eutectic point is limited to a very narrow area in which the weight fraction of potassium dichromate does not exceed 3%.Using the Skrynemakers method, it was found that in a region with a calcium chloride content of less than 40 %, potassium dichromate crystallizes. For the region adjacent to the apex of calcium chloride, it is impossible to establish the composition of the solid phase and the boundaries of its crystallization using the Skrynemakers method. This is due to the fact that the binary system CaCl2 - K2Cr2O7 is a ternary reciprocal system K +, Ca2 + Cl-, Cr2O72- . In this area, the formation of solid solutions or compounds based on the binary system K2Cr2O7 - CaCr2O7 is supposed. For the temperature range from -7 ?С to 50 ?С, the refrigerant composition was proposed: 3 % K2Cr2O7 - 10.2 % CaCl2 - 86.8 % H2O. In the temperature range from 20 ?С to 60 ?С, the composition of the solution is: 6 % K2Cr2O7 – 10 % CaCl2 – 84 % H2O.

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Section: материалы и методыunclassified

Prospects for the use of liquid waste from the production of sodium carbonate as a coolant based on the ternary system CaCl2-K2Cr2O7-H2O

Плотникова

Peregudov

Горбунова

et al. 2020

Vestn. Voronež. gos. univ. inž. tehnol.

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“…Способность меди к комплексообразованию позволяет количественно определять содержание ионов меди в растворе различными фотометрическими методами [5]. Сущность используемой методики [6] заключается в измерении оптической плотности окрашенного раствора аммиаката меди, полученного в ходе реакции:…”

Section: Characteristics Of Fiber Fiban X-i функциональные группыunclassified

Use of ion-exchange fiber at the purification stage of wastewater of electroplating

Перегудов

Timkova

Горбунова

et al. 2019

Vestn. Voronež. gos. univ. inž. tehnol.

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In the electroplating industry, large volumes of water are used, which are polluted at various stages in the process. Waste water containing transition metal ions is not only a dangerous source of environmental pollution, but also valuable waste. Taking into account the problems associated with the ecology and the rational use of natural resources, it is necessary to create low- and non-waste production, in particular, to develop new technological processes and appropriate equipment, to introduce water-circulation cycles. This paper presents the results of a study of the sorption of copper (II) and nickel (II) cations by the FIBAN X-1 ion exchange fiber. Calorimetric studies of the thermal effects of the interaction of FIBAN X-1 fiber with solutions of copper (II) and nickel (II) nitrates were carried out. It is shown that the power, thermal effect and time of the process depend on the nature and concentration of metal ions in the solution. Based on the experimental data, the enthalpy of the process was calculated. The endothermic effect of the process is explained by the energy costs associated with dehydration effects and changes in the conformation of the polymer fiber chains. Sorption isotherms of these ions were obtained. It has been established that at all concentrations studied, Ni2 + ions under these conditions are absorbed by ion exchange fibers better than Cu2 + cations. The calculated sorption constants for copper (II) and nickel (II) are greater than 1. It is shown that the Langmuir equation describes the sorption isotherm better than the Freundlich equation. For deep purification of waste water from metal ions, it was proposed to use the fibrous sorbent FIBAN X-1.

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“…Both the production of solid mixed-ligand salts (MLSs) and the simultaneous study of mixed-ligand complexes (MLCs) in a solution based on nitrogen and oxygen ligands are of particular interest [17][18][19][20][21][22][23]. Therefore, the purpose of this study was to develop a method for synthesizing the mixed-ligand compounds of copper(II) with tartaric and salicylic acid anions and azoles using previously synthesized slightly soluble tartrate and salicylate of copper(II).…”

Section: Introductionmentioning

confidence: 99%

Interaction of Copper(II) Ions with Certain Oxyacids and Azoles

Skorik,

Tomilova,

Pastushchak

et al. 2023

Inorganics

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Compounds composed of [[Cu(HIm, metIm)2‒3L] ∙ nH2O (n = 0, 2) were obtained during the interaction of slightly soluble tartrate and copper(II) salicylate composed of CuL ∙ nH2O (n = 1–2, L2−—Tar2−, Sal2−) with imidazole (HIm) and 2-methylimidazole (metIm). Mono- and bi-ligand salts were analyzed; the process of their thermal decomposition was studied. The solubility constants KS of the CuC4H4O6 ∙ 2H2O tartrate and CuC7H4O3 ∙ H2O salicylate of copper(II) with at ionic strength of 0.3 were determined. The IR spectroscopy method showed the participation in complexation of the nitrogen atom N(3) of imidazole and the oxygen atoms of the carboxyl groups of oxyacids, as well as the hydroxyl group of salicylic acid in the mixed-ligand salts of copper(II). The compositions and stability of the imidazole-tartrate(salicylate) copper(II) complexes in an aqueous solution were determined by performing photometry and spectrophotometry and of the monoligand complexes [CuTar] and [CuSal] were determined by solubility and isomolar series methods.

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Mixed-ligand complexes of copper (II) with ditiolfenols and heterocyclic diamines

Cited by 4 publications

References 1 publication

Prospects for the use of liquid waste from the production of sodium carbonate as a coolant based on the ternary system CaCl2-K2Cr2O7-H2O

Prospects for the use of liquid waste from the production of sodium carbonate as a coolant based on the ternary system CaCl2-K2Cr2O7-H2O

Use of ion-exchange fiber at the purification stage of wastewater of electroplating

Interaction of Copper(II) Ions with Certain Oxyacids and Azoles

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