Aggregation-induced emission mesogens formed by intermolecular hydrogen bonding of 4-alkyl-4′-cyanobiphenyl molecules
作者:Po-Ting Chou、Tsung Yang Ho、Jia-Ying Cai、Huang-Teng Lin、Chung-Hung Hsieh、Chih-Hsin Chen
DOI:10.1039/d3tc01468a
日期:——
The AIE properties of these molecules are caused by the intermolecular hydrogen bonding between –OH and –NH groups on the alkyl chain, which restricted the intermolecular motion to facilitate the radiative decay in their state of aggregation. Furthermore, in contrast to 5CB which exhibits an anti-parallel alignment, the 4-alkyl-4′-cyanobiphenyl-based molecules exhibited a parallel alignment induced
基于4-烷基-4'-氰基联苯(例如4'-戊基-4-氰基联苯(5CB))的液晶分子的发光特性由于分子间偶极-偶极相互作用引起的荧光猝灭以及游离态的荧光猝灭而较少被研究。分子内运动。在此,我们报道了三种4-烷基-4'-氰基联苯基分子,即、2CB-NC2O、2CB-NC3O 和 2CB-NC4O,具有聚集诱导发射 (AIE) 特性。值得注意的是,2CB-NC2O 和 2CB-NC3O 除了具有 AIE 特性外,还在室温下表现出液晶近晶 A 相。这些分子的AIE特性是由烷基链上的-OH和-NH基团之间的分子间氢键引起的,这限制了分子间运动,从而促进其聚集状态下的辐射衰变。此外,与表现出反平行排列的5CB相比,基于4-烷基-4'-氰基联苯的分子表现出由分子间氢键诱导的平行排列,从而抑制其荧光的偶极-偶极猝灭。这项研究不仅引入了发光液晶的新颖设计理念,