镉基杂化晶体的介电相变和蓝白光致发光双重特性

Dual Functions of Phase-Transition Dielectric and Blue-White Photoluminescence in a Hybrid Crystal(bempy)_(2)CdBr_(4)

通过采用容易无序的胺,我们合成了2种有机无机杂化晶体,分别为基于bempy(bempy=1⁃甲基⁃1⁃溴乙基吡咯烷阳离子)的溴盐化合物(bempy)Br(1)和镉基溴化物(bempy)_(2)CdBr_(4)(2),并对其结构相变、介电相变和蓝白荧光进行了详细的表征分析。化合物1在测试温度范围内未观察到可逆相变,化合物2为高温介电相变,介电和差示扫描量热法测试表征其相变温度为357 K。同时,化合物1和2均具备蓝白光致发光特性,荧光测试表明,化合物1和2分别在538 nm和547、750 nm处存在发射峰。化合物2具备介电相变和蓝白光致发光的双重特性。

We have successfully synthesized two organic⁃inorganic hybrid crystals,which are(bempy)Br(1)and(bempy)_(2)CdBr_(4)(2),based on bempy(bempy=1⁃bromoethyl⁃1⁃methylpyrrolidinium)by employing easily disordered amines.Structural phase transitions analysis,dielectric phase transition measurements,and blue⁃white fluorescence spectroscopy measurements were performed on them.It is notable that,no reversible phase transition was observed in compound 1,and compound 2 exhibited high⁃temperature dielectric phase transition anomalies at around 357 K by differential scanning calorimetry and dielectric measurements.Both compounds showed blue⁃white photolumi⁃nescence with one emission peak at 538 nm for compound 1 and two emission peaks at 547 and 750 nm for com⁃pound 2.Significantly,compound 2 possesses dual functions of dielectric phase transition and blue⁃white photolumi⁃nescence.CCDC:2155028,1;2155029,2.