Abstract
Purpose: The research objective is to expand the class of coordination compounds of copper(II) and cobalt(II) with polyfunctional properties. Moreover, the targeted synthesis of Cu(II) and Co(II) complexes with cationic N-heterocycles as well as their versatile physicochemical study using state-of-the-art methods in order to establish the “composition–structure–property” relationship is an urgent task for modern inorganic chemistry.
Methodology: To solve the problem of the relationship between the composition, structure and properties of compounds, a number of modern physical and chemical methods were used, such as elemental analysis, infra-red (IR) spectroscopy, X-ray diffraction analysis, differential scanning calorimetry (DSC) and thermogravimeter (TG).
Findings: A number of new coordination compounds of copper(II) and cobalt(II) with nitrogen-containing heterocyclic cations have been synthesized: (L1)2[CuCl4], (L1)2[CoCl4], (L1)2[CuBr4], (H2L2)[CuCl4], (H2L2)[CoCl4], (H2L2)[CuBr4] (where (L1)+ is 2,3,5-triphenyltetrazolium, and (H2L2)2+ is trans-2,5-dimethylpiperazinium).
Value: By means of differential scanning calorimetry for L12[CuCl4] and L12[CuBr4] copper(II) compounds, monotropic phase transitions were revealed, which are of the “order/disorder” type and are accompanied by thermochromism, as well as first-order phase transitions corresponding to the melting process. Based on the X-ray structural analysis, the relationship between the parameters in the MHal4 coordination node is revealed: the maximum values of the M-Hal bond lengths and Hal-M-Hal coordination angles are linearly dependent on their minimum parameters.
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This research was funded by Russian science foundation, grant number 20-63-46026.
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Protsenko, A.N., Garifova, V.V., Shakirova, O.G. (2021). Structure and Properties of Copper(II) and Cobalt(II) Halide Complexes with N–Heterocycles of Composition (HL)n[MHal4]. In: Shakirova, O.G., Bashkov, O.V., Khusainov, A.A. (eds) Current Problems and Ways of Industry Development: Equipment and Technologies. Lecture Notes in Networks and Systems, vol 200. Springer, Cham. https://doi.org/10.1007/978-3-030-69421-0_28
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