Reversible structural phase transition, dielectric switches and photoluminescence based on hexathiocyanate Thulium(III) anions
Reversible structural phase transition, dielectric switches and photoluminescence based on hexathiocyanate Thulium(III) anions
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基于六硫氰酸铥(III)阴离子的可逆结构相变、介电开关和光致发光
DOI：
10.1016/j.ica.2020.120051
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发表时间：
2021
影响因子：
2.8
通讯作者：
Tang Yun-Zhi
中科院分区：
文献类型：
--
作者：
Dong Xing-Xian;Tang Yun-Zhi
氯化铥（III）水合物与硫氰酸钾和氯化四丁基铵以1：6：1的比例形成新化合物[（（nBu）4N）3][Tm（SCN）6]（1），（nBu = CH3CH2CH2CH2）。差示扫描量热法（DSC）测量结果表明，化合物1在204.6 K（加热）和188.7 K（冷却）处有一对可逆峰，热滞约为15.9 K，表明化合物1发生了可逆的结构相变。介电测量进一步证实了相变。X射线单晶衍射分析表明，化合物1在140 K和300 K温度下属于三斜晶系，空间群为P −1，表明相变是等对称的Zhang et al.（2013）[1]。结构分析表明，[（nBu）4N]+离子的无序，导致了可逆的结构相变。固体荧光光谱结果表明，化合物1的发射峰位于458 nm处，这对稀土金属有机化合物荧光材料的开发具有重要意义。
Thulium(III) chloride hydrate with potassium thiocyanate and tetrabutylammonium chloride formed a novel compound [((nBu)4N)3][Tm(SCN)6] (1), (nBu = CH3CH2CH2CH2) in the ratio 1:6:1. Differential scanning calorimetry (DSC) measurements show a pair of reversible peaks at 204.6 K (heating) and 188.7 K (cooling) with a heat hysteresis about 15.9 K, indicating the compound1undergoes a reversible structural phase change. Dielectric measurement further confirms the phase transition. X-ray single crystal diffraction analysis shows that the compound1belongs to triclinic crystal system inP−1 space group at temperatures of 140 K and 300 K, suggesting the phase transition is isosymmetric Zhang et al. (2013) [1]. The analysis of structure reveals that the disorder of the [(nBu)4N]+cation, leading to the reversible structural phase transition. The results of solid-state fluorescence show that the emission peak of compound1is 458 nm, and which is of great significance to the development the fluorescence materials of the rare earth organometallic compounds.