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Thermodynamic Phase Transition Triggered by Distinct Distortion and Ordering of Dipropylammonium Picrate
Author(s) -
Zhou Yuelan,
Chen Tianliang,
Sun Zhihua,
Zhang Shuquan,
Ji Chengmin,
Song Cheng,
Luo Junhua
Publication year - 2015
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201402997
Subject(s) - picrate , differential scanning calorimetry , phase transition , hysteresis , anomaly (physics) , thermal hysteresis , chemistry , phase (matter) , crystallography , anisotropy , dielectric , distortion (music) , materials science , thermodynamics , condensed matter physics , ion , organic chemistry , physics , amplifier , optoelectronics , cmos , quantum mechanics
Dipropylammonium picrate (compound 1 ) undergoes a first‐order phase transition at 185.0 K. Differential scanning calorimetry (DSC) measurements show reversible anomaly peaks with a thermal hysteresis of 10.2 K. Dielectric responses with distinct anisotropy and striking anomaly further confirm the phase transition. Detailed structural analyses demonstrate that the phase transition in 1 is dominated by order–disorder transformations of the dipropylammonium (DPA) cations and the picrate anions. Moreover, the unique distortions of the terminal propyl moieties in the flexible chain‐like DPA cation also play an important role in this structural phase transition. All these results indicate that 1 is a potential phase‐transition material.