Реферат: The reaction of copper(II) salts with 3,5-dinitro-1H-pyrazole (Hdnpz) in an acetonitrile medium yielded two distinct types of mononuclear coordination compounds depending on the reaction conditions and the presence of a deprotonating agent. In the presence of triethylamine, the (Et3NH)2[Cu(dnpz)4] complex (I) was obtained, which was isolated as two crystalline phases: a highly disordered tetragonal phase I' and a stable triclinic phase I''. In the absence of an external base, the reaction with copper(II) acetate afforded theneutral molecular complex [Cu(dnpz)2(MeCN)2] (II), which crystallizes in the trans-configuration. The Cu(II) metal center in complex I exhibits a slightly distorted square-planar geometry, whereas the trans-II complex demonstrates a strongly elongated pseudo-octahedral coordination (CuN4O2) driven by a pronounced Jahn-Teller effect. IR spectroscopy and powder X-ray diffraction (PXRD) revealed that the crystalline sample of II exhibits phase heterogeneity due to the presence of the cis-isomer, which was confirmed by room-temperature electron paramagnetic resonance (EPR) spectroscopy.

Библиографическая ссылка: Nikiforova M.E. , Kiskin M.A. , Efimov N.N. , Sidorov A.A. , Dalinger I.L. , Eremenko I.L.
Mononuclear Copper(II) Complexes based on 3,5-Dinitro-1Hpyrazole: Synthesis, Structure, and Phase Composition Study
Russian Journal of Coordination Chemistry. 2026. Т.52. 47 . DOI: 10.1134/S1070328426600981

Даты:

Опубликована online:

30 июл. 2026 г.

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