Phase Transition Originating from Disorder-Order Transformation Coupled with Reorientation in the Organic-Inorganic Hybrid Compound (C₄H₁₄N₂)[Cd₂(H₂O)₆(SO₄)₃]

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• 作者：Rong Mu ; Chun-Hong Chen ; Li Zhang ; Dian-Zeng Jia and Guan-Cheng Xu
• 刊名：European Journal of Inorganic Chemistry
• 出版年：2017
• 出版时间：February 03, 2017
• 年：2017
• 卷：2017
• 期：5
• 页码：932-937
• 全文大小：1435K
• ISSN：1099-0682c

文摘

The organic–inorganic hybrid compound 1,4-butyldiammonium hexaaquadicadmium(II) trisulfate (C₄H₁₄N₂)[Cd₂(H₂O)₆(SO₄)₃] (1) was synthesized by the reaction of 3CdSO₄·8H₂O with 1,4-butanediamine in sulfuric acid aqueous solution. Differential scanning calorimetry measurements indicate that 1 undergoes a reversible phase transition at 243.4 K with a thermal hysteresis of 3.3 K. Single-crystal X-ray diffraction data disclose that the phase transition is from the room-temperature phase with the space group C2/c to the low-temperature phase with the space group P1 with the Aizu notation of 2/mF1. The structural phase transition of 1 is ascribed to the coupling of disorder–order transformations of the flexible 1,4-butyldiammonium cation and a sulfate anion and reorientation of the cation. The temperature dependence of the dielectric permittivity demonstrates a step-like change in the range 200–260 K, which makes (C₄H₁₄N₂)[Cd₂(H₂O)₆(SO₄)₃] a promising switchable dielectric material. The results could offer an avenue to design switchable dielectric materials through the synergistic effect of disorder–order transitions and reorientation motion.