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Phase Transition Originating from Disorder–Order Transformation Coupled with Reorientation in the Organic–Inorganic Hybrid Compound (C 4 H 14 N 2 )[Cd 2 (H 2 O) 6 (SO 4 ) 3 ]
Author(s) -
Mu Rong,
Chen ChunHong,
Zhang Li,
Jia DianZeng,
Xu GuanCheng
Publication year - 2017
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201601357
Subject(s) - chemistry , differential scanning calorimetry , phase transition , dielectric , crystallography , phase (matter) , sulfuric acid , transition temperature , crystal structure , space group , permittivity , x ray crystallography , analytical chemistry (journal) , diffraction , inorganic chemistry , materials science , organic chemistry , condensed matter physics , thermodynamics , physics , superconductivity , optoelectronics , optics
The organic–inorganic hybrid compound 1,4‐butyldiammonium hexaaquadicadmium(II) trisulfate (C 4 H 14 N 2 )[Cd 2 (H 2 O) 6 (SO 4 ) 3 ] ( 1 ) was synthesized by the reaction of 3CdSO 4 · 8H 2 O 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 C 2/ c to the low‐temperature phase with the space group P 1 with the Aizu notation of 2/ mF 1 . 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 (C 4 H 14 N 2 )[Cd 2 (H 2 O) 6 (SO 4 ) 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.