Abstract
Anhydrous magnesium methanesulfonate (Mg(SO3CH3)2) and calcium methanesulfonate (Ca(SO3CH3)2) as well as hydrates Mg(SO3CH3)2 · 2H2O and Mg(SO3CH3)2 · 12H2O have been prepared and identified. Thermal degradation of the salts in air has been studied by thermogravimetric analysis. Parameters of phase transformations of Ca(SO3CH3)2 and Mg(SO3CH3)2 · 2H2O observed at –62.7 and –119°С, respectively, have been found by differential scanning calorimetry. Melting point of Mg(SO3CH3)2 · 12H2O (45.4°С) synthesized immediately in DSC instrument because of compound instability in air has been determined. Incongruent melting has been shown for Mg(SO3CH3)2 · 12H2O.
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ACKNOWLEDGMENTS
The authors thank the Center for Molecular Structure Studies, Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Science, and Professor, Dr. Sci. (Chem.) A.A. Goryunkov, head of Laboratory of Thermochemistry, Moscow State University, for the possibility to publish this material.
Funding
This work was performed using equipment of the Shared Facility Center, Moscow State University, under the Program of Development for the Moscow State University, with financial support by the Russian Foundation for Basic Research (project for young scientists no. 16-33-00958 “Structure, Physicochemical Properties of Phases and Phase Equilibria in the Systems of Salts of Methanesulfonic Acid with Mono- and Divalent Cations”), and partial support of the “Chemical Thermodynamics” project (АААА-А16-116061750195-2).
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Translated by I. Kudryavtsev
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Kosova, D.A., Provotorov, D.I., Kuzovchikov, S.V. et al. Thermal Analysis Study of Phase Transformations of Magnesium and Calcium Methanesulfonates. Russ. J. Inorg. Chem. 65, 752–757 (2020). https://doi.org/10.1134/S0036023620050125
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DOI: https://doi.org/10.1134/S0036023620050125