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Sequential Phase Transitions Near Room Temperature in a Metal–Crown Ether Compound SbBr 3 (15‐Crown‐5)
Author(s) -
Ye Qiong,
Zhou Lin,
Wang HuiTing,
Kong LiHui,
Zheng Xuan,
Fu DaWei
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201600841
Subject(s) - isostructural , crown ether , differential scanning calorimetry , dielectric , raman spectroscopy , crystallography , phase transition , ether , phase (matter) , chemistry , crystal structure , metal , materials science , ion , organic chemistry , thermodynamics , physics , optoelectronics , optics
A molecular metal–crown ether coordination compound, SbBr 3 (15‐crown‐5) ( 1 ), has been discovered to undergo an isostructural phase transition at 233.1 K ( T 1 ) and another symmetry‐breaking one at 294.5 K ( T 2 ), accompanied by thermal and dielectric anomalies, which were confirmed by differential scanning calorimetry (DSC) measurements, dielectric measurements, variable‐temperature structural analyses and Raman spectra. The crystal structures determined at 173, 238, and 318 K were solved in P 2 1 2 1 2 1 , P 2 1 2 1 2 1 , Pnma , respectively. Structural analyses reveal that both the changes of the crown ether conformation and the displacements of the Sb cation and Br anion lead to the sequential and reversible phase transitions.