title: Thermodynamic phase transition triggered by distinct distortion and ordering of dipropylammonium picrate.
abstract: 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.
authors.affiliation: Key Laboratory of Optoelectronic Materials Chemistry and Physics, State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002 (China); College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022 (China).
authors.forename: Yuelan
authors.initials: Y
authors.lastname: Zhou
authors.forename: Tianliang
authors.initials: T
authors.lastname: Chen
authors.forename: Zhihua
authors.initials: Z
authors.lastname: Sun
authors.forename: Shuquan
authors.initials: S
authors.lastname: Zhang
authors.forename: Chengmin
authors.initials: C
authors.lastname: Ji
authors.forename: Cheng
authors.initials: C
authors.lastname: Song
authors.forename: Junhua
authors.initials: J
authors.lastname: Luo
keywords: dielectric anomalies and anisotropy; distortion; order-disorder; phase transitions; picric acid