基于铕取代多金属氧簇的手性发光液晶材料(英文)

Chiral Luminescent Liquid Crystal Material Based on Europium-Substituted Polyoxometalate

将铕取代的多金属氧簇引入手性液晶体系是构筑多功能手性发光软材料的有力工具。圆二色谱表明手性两亲分子可以通过静电相互作用诱导非手性多金属氧簇显示出超分子手性。差示扫描量热法、偏光显微镜和变温X射线衍射证实这种有机无机杂化的多金属氧簇复合物具有热致液晶性质。复合物的薄膜显示出本征发光,并且我们可以通过温度调控复合物的发光性质。用手性介晶阳离子静电包覆多金属氧簇是构筑多金属氧簇基手性发光液晶材料的有效方法。

The incorporation of europium-substituted polyoxometalate （PM） into chiral amphiphiles is attractive for the fabrication of multifunctional chiral luminescent liquid crystalline materials. Chiral amphiphiles acted as good promoters to trigger the achiral PM to show induced supramolecular chiraiity through electrostatic interactions, as illustrated by circular dichroism （CD） spectra. Differential scanning calorimetry （DSC）, polarized optical microscopy （POM）, and temperature-dependent X-ray diffraction （XRD） analysis confirmed that the organic/inorganic hybrid polyoxometalate complex exhibited thermotropic mesomorphic behaviors. In a cast film, the complex displayed intrinsic luminescence that could be adjusted by accurately controlling the temperature. The electrostatic encapsulation of PM with chiral mesomorphic promoters provides an effective method for constructing PM-based chiral luminescent liquid crystalline materials.