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An Order–Disorder Ferroelectric Host–Guest Inclusion Compound
Author(s) -
Zhang Yi,
Ye HengYun,
Fu DaWei,
Xiong RenGen
Publication year - 2014
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201307690
Subject(s) - ferroelectricity , differential scanning calorimetry , dielectric , phase transition , crystallography , chemistry , hysteresis , perchlorate , materials science , stereochemistry , condensed matter physics , thermodynamics , ion , physics , organic chemistry , optoelectronics
The host–guest complex [(DIPA)([18]crown‐6)](ClO 4 ) ( 1 ; DIPA=2,6‐diisopropylanilinium) was constructed and found to undergo a sequence of phase transitions ( Ibam – Pbcn – Pna 2 1 ) at T 1 =278 K and T 2 =132 K, respectively. Systematic characterizations, such as differential scanning calorimetry, heat capacity, temperature‐dependent dielectric constant, and P–E hysteresis loop, reveal that the centrosymmetric‐to‐polar phase transition at T 2 is a paraelectric‐to‐ferroelectric transition. The symmetry breaking was also confirmed by temperature‐dependent second‐harmonic generation effect and X‐ray powder diffraction. The ferroelectric mechanism is attributable to the linear motion of the perchlorate counterions accompanied by the order–disorder transition of the [18]crown‐6 molecules and the anions.