Inorganic anion regulated phase transition in a supramolecular adduct: 4-Trifluoromethoxyanilinium hexafluorophosphate-18-crown-6 |
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| Affiliation: | 1. Department of Chemical and Biological Engineering, Iowa State University, Ames, IA 50011, USA;2. Climate Change Research Division, Korea Institute of Energy Research, 102 Gajeong-ro, Yuseong-gu, Daejeon 305-343, South Korea;3. Center for Sustainable Environmental Technologies, Iowa State University, Ames, IA 50011, USA;4. Center for Biorenewables Chemicals, Iowa State University, Ames, IA 50011, USA;1. N.N. Vorozhtsov Novosibirsk Institute of Organic Chemistry, Siberian Branch of the Russian Academy of Sciences, 9 Lavrentiev Avenue, 630090, Novosibirsk, Russian Federation;2. Novosibirsk State University, Pirogov Avenue 2, 630090, Novosibirsk, Russian Federation;3. Boreskov Institute of Сatalysis, Siberian Branch of the Russian Academy of Sciences, 5 Lavrentiev Avenue, 630090, Novosibirsk, Russian Federation;4. Nikolaev Institute of Inorganic Chemistry, Siberian Branch of the Russian Academy of Sciences, 3 Lavrentiev Avenue, 630090, Novosibirsk, Russian Federation;1. School of Metallurgy and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou, 341000, PR China;2. College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou, 341000, PR China;1. Department of Bioregulatory Science of Life-related Diseases, Faculty of Medicine Fukuoka University, Fukuoka, Japan;2. Department of Regenerative Medicine and Transplantation, Faculty of Medicine Fukuoka University, Fukuoka, Japan;3. Department of Gastroenterological Surgery, Faculty of Medicine Fukuoka University, Fukuoka, Japan;4. Center of Genomic Medicine, Saitama Medical University, Saitama, Japan;5. Islet Institute Fukuoka University, Fukuoka, Japan;6. Department of Endocrinology and Diabetes Mellitus, Faculty of Medicine Fukuoka University, Fukuoka, Japan |
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| Abstract: | A new supramolecular adduct 4-trifluoromethoxyanilinium hexafluorophosphate-1,4,7,10,13,16-hexaoxacyclooctadecane ([C7H7NOF3–(18-crown-6)]+[PF6]−) was synthesized and separated as crystals. DSC measurement detected that this compound undergoes a reversible phase transition at about 158 K with a heat hysteresis of 4.8 K. The single crystal X-ray diffraction data obtained at 213 K and 113 K suggest that the phase transition undergoes from a high temperature phase with a space group of Pnma to a low temperature one with a space group of P21/n, the symmetry breaking occurs with an Aizu notation of mmmF2/m. The driving force of the transition may be ascribed to the order–disorder transformation of the inorganic PF6− anion. Broad peak dielectric anomaly observed at 157 K further confirms this phase transition. |
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