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Two-stage thermal decomposition of 18-crown-6 and dicyclohexano-18-crown-6 complexes with alkaline earth metal halides as evidence for non-equivalence of macrocycle symmetryстатья Исследовательская статья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Zakurdaeva Olga A., Kuchkina Irina O., Kurkin Tikhon S., Nesterov Sergey V.
- Журнал: Journal of Thermal Analysis and Calorimetry
- Год издания: 2023
- Издательство: Akademiai Kiado
- Местоположение издательства: Hungary
- DOI: 10.1007/s10973-023-12470-0
- Аннотация: Thermal stability of macrocyclic complexes with alkaline earth metal salts is of crucial importance for their applicability as the components of new electrolytes, ionic liquids and precursors in chemical vapor deposition processes. The complexes of 18-crown-6 and stereoisomeric dicyclohexano-18-crown-6 with alkaline earth metal halides were synthesized and studied by the combination of simultaneous DSC/TGA and FTIR-spectroscopy. The stability of these compounds depended on the size of the cation and anion as follows: Ba2+ < Sr2+ < Ca2+ and Cl− < Br− ≈ I−. The two-stage mechanism of destruction was found for the complexes with CaCl2, SrBr2, SrI2. This implies, most probably, the coexistence of two conformationally nonequivalent forms of the macrocycles with different thermal stability rather than the destruction of the macrocycle at high temperatures. The revealed trends, in our opinion, were caused by changes in the interaction energy between macrocycle and metal cation. Acknowledgements: The work was performed with financial support from the Ministry of Science and Higher Education of the Russian Federation grant No. FFSM-2021-0004 by using the equipment of CollaborativeAccess Center “Center for Polymer Research” of ISPM RAS.
- Добавил в систему: Закурдаева Ольга Анатольевна
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