AbstractWith the aim of controlling the orientation of liquid crystals (LCs) toward realizing external stimuli–responsive materials with tunable functionalities, we synthesized a composite of LCs and metal–organic frameworks (MOFs) by filling LCs into the pores of MOFs (LC@MOFs) for the first time. The included LCs interact with the MOFs through coordination bonds between the cyano groups of the LCs and the metal ions of the MOFs, enabling the orientation of the LC molecules inside the pores of the MOFs and the realization of birefringence of LC@MOFs. The three‐dimensional nanometer interstice frameworks maintained the LC orientation even at temperatures much higher than the isotropic phase transition temperature of bulk LCs. Furthermore, the orientational state changed upon heating or cooling, inducing temperature‐dependent birefringence. This study provides a new approach to the development of stimuli–responsive optical materials and stimuli–responsive MOFs.
摘要为了控制液晶(LCs)的取向以实现具有可调功能的外部刺激响应材料,我们首次将液晶填充到
金属有机框架(MOFs)的孔隙中,合成了液晶和
金属有机框架的复合材料(LC@MOFs)。其中的低聚物通过低聚物的
氰基和 MOFs 的
金属离子之间的配位键与 MOFs 相互作用,实现了低聚物分子在 MOFs 孔隙内的定向,并实现了 LC@MOFs 的双折射。即使在远高于块状低聚物各向同性相变温度的条件下,三维纳米间隙框架仍能保持低聚物的取向。此外,加热或冷却时取向状态会发生变化,从而产生随温度变化的双折射。这项研究为开发刺激响应光学材料和刺激响应 MOFs 提供了一种新方法。