title: Plastic Crystals with Polar Halochromate Anion: Thermosensitive Dielectrics Based upon Plastic Transition and Dipole Rotation.
abstract: Plastic crystals functioning with rotatable components offer new opportunities in areas such as modern optoelectronic materials. Here, by taking advantage of controllable rotation of the polar component within the ion-pair plastic-crystal system, we present two such crystals, namely, (Et4N)(CrO3X) (X = Cl or Br), which are unusual examples exhibiting two-staged thermosensitive dielectric responses above room temperature. The frequency-dependent response in the first stage is due to the structural phase transitions, whereas that in the second stage is induced by dynamic rotation of the polar halochromate anions in their NaCl-type plastic-crystal phases. The intrinsic mechanisms were also explicated by molecular dynamics simulations, providing a direct insight into the dynamic characteristics of these two compounds. These studies show that ionic plastic crystals functioning with polar groups are an attractive candidate as sensitive thermoresponsive dielectric materials.
authors: Key Laboratory of Jiangxi University for Functional Materials Chemistry, College of Chemistry and Chemical Engineering, Gannan Normal University , Ganzhou 341000, China.
authors: Yu-Zhi
authors: YZ
authors: Sun
authors: MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University , Guangzhou 510275, China.
authors: Bo
authors: B
authors: Huang
authors: MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University , Guangzhou 510275, China.
authors: Wei-Jian
authors: WJ
authors: Xu
authors: MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University , Guangzhou 510275, China.
authors: Dong-Dong
authors: DD
authors: Zhou
authors: MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University , Guangzhou 510275, China.
authors: Shao-Li
authors: SL
authors: Chen
authors: Key Laboratory of Jiangxi University for Functional Materials Chemistry, College of Chemistry and Chemical Engineering, Gannan Normal University , Ganzhou 341000, China.
authors: Shi-Yong
authors: SY
authors: Zhang
authors: Key Laboratory of Jiangxi University for Functional Materials Chemistry, College of Chemistry and Chemical Engineering, Gannan Normal University , Ganzhou 341000, China.
authors: Zi-Yi
authors: ZY
authors: Du
authors: Key Laboratory of Jiangxi University for Functional Materials Chemistry, College of Chemistry and Chemical Engineering, Gannan Normal University , Ganzhou 341000, China.
authors: Yong-Rong
authors: YR
authors: Xie
authors: MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University , Guangzhou 510275, China.
authors: Chun-Ting
authors: CT
authors: He
authors: MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University , Guangzhou 510275, China.
authors: Wei-Xiong
authors: WX
authors: Zhang
authors: MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry and Chemical Engineering, Sun Yat-Sen University , Guangzhou 510275, China.
authors: Xiao-Ming
authors: XM
authors: Chen