title: Phase transition metal-crown ether coordination compounds tuned by metal ions.
abstract: Two isostructural metal crown ether coordination compounds, (15-crown-5)(BiCl3) 1 and (15-crown-5)(SbCl3) 2, are discovered to show phase transitions above room temperature, where the phase transition temperature relates to the metal center. Compound 1 crystallizes in the chiral orthorhombic space group P212121 in the low temperature phase and undergoes a reversible phase transition around 365 K to crystallize in the polar orthorhombic space group Pna21 in the high temperature phase, accompanied by thermal and dielectric anomalies. The variable-temperature structure analyses of compound 1 show that the phase transition is rooted in the conformational change of the crown ether and the displacement of the Bi cation and Cl anion.
authors.affiliation: Ordered Matter Science Research Center, Southeast University, Nanjing, China. yeqiong@seu.edu.cn dawei@seu.edu.cn.
authors.forename: Qiong
authors.initials: Q
authors.lastname: Ye
authors.affiliation: Ordered Matter Science Research Center, Southeast University, Nanjing, China. yeqiong@seu.edu.cn dawei@seu.edu.cn.
authors.forename: Hui-Ting
authors.initials: HT
authors.lastname: Wang
authors.affiliation: Ordered Matter Science Research Center, Southeast University, Nanjing, China. yeqiong@seu.edu.cn dawei@seu.edu.cn.
authors.forename: Lin
authors.initials: L
authors.lastname: Zhou
authors.affiliation: Ordered Matter Science Research Center, Southeast University, Nanjing, China. yeqiong@seu.edu.cn dawei@seu.edu.cn.
authors.forename: Li-Hui
authors.initials: LH
authors.lastname: Kong
authors.affiliation: Ordered Matter Science Research Center, Southeast University, Nanjing, China. yeqiong@seu.edu.cn dawei@seu.edu.cn.
authors.forename: Heng-Yun
authors.initials: HY
authors.lastname: Ye
authors.affiliation: Ordered Matter Science Research Center, Southeast University, Nanjing, China. yeqiong@seu.edu.cn dawei@seu.edu.cn.
authors.forename: Da-Wei
authors.initials: DW
authors.lastname: Fu
authors.affiliation: Ordered Matter Science Research Center, Southeast University, Nanjing, China. yeqiong@seu.edu.cn dawei@seu.edu.cn.
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhang