Solid-state phase transition induced by ordering of flexible chain alkylamine in N-ethyl-n-butylammonium 3, 5-dinitrobenzoate monohydrate |
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| Affiliation: | 1. College of Chemistry, Fuzhou University, Fuzhou 350116, China;2. Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China;1. School of Chemistry & Chemical Engineering, Xi''an Shiyou University, Xi''an 710065, Shaanxi, PR China;2. School of Chemical Engineering, Shaanxi Key Laboratory of Degradable Medical Material, Northwest University, Xi''an 710069, Shaanxi, PR China;1. Department of Organic Chemistry, Biochemistry and Catalysis, Faculty of Chemistry, University of Bucharest, Sos. Panduri nr. 90, 050663 Bucharest, Romania;2. Inorganic Chemistry Laboratory, Faculty of Chemistry, University of Bucharest, Str. Dumbrava Roşie nr. 23, 020464 Bucharest, Romania;1. MOE Key Laboratory of Cluster Science, School of Chemistry, Beijing Institute of Technology, Beijing 100081, China;2. College of Chemistry and Chemical Engineering, Qingdao University, Qingdao, Shandong 266071, China;1. Nikolaev Institute of Inorganic Chemistry, 3 Acad. Lavrentiev Ave., Novosibirsk 630090, Russia;2. Novosibirsk State University, 2 Pirogova St., Novosibirsk 630090, Russia;1. Instituto de Química y Bioquímica, Universidad de Valparaíso, Av. Gran Bretaña 1111, Valparaíso, Chile;2. Instituto de Química, Pontificia Universidad Católica de Valparaíso, Casilla 4059, Valparaíso, Chile |
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| Abstract: | A new molecule-based compound, N-ethyl-n-butylammonium 3, 5-dinitrobenzoate monohydrate, which undergoes a reversible solid-state phase transition at 197 K (Tc), has been successfully constructed based on long-chain alkylamine. Specific heat capacity and differential scanning calorimetry (DSC) measurements confirm that it is first-order phase transition with a 5 K thermal hysteresis between heating and cooling scans. Dielectric constants exhibit distinct anomalies around Tc accompanied with step-like responses between low and high dielectric states, which further confirm the phase transition. Variable-temperature single-crystal X-ray diffraction analyses illustrate that the phase transition was elucidated from ordering of the flexible N-ethyl-n-butylammonium cations coupled with reorientational motion of the alkylamine chain. |
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