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- Title
Liquid-Crystalline Mesogens Based on Cyclo[6]aramides: Distinctive Phase Transitions in Response to Macrocyclic Host-Guest Interactions.
- Authors
Li, Xiaowei; Li, Bao; Chen, Long; Hu, Jinchuan; Wen, Chengdanyang; Zheng, Qingdong; Wu, Lixin; Zeng, Huaqiang; Gong, Bing; Yuan, Lihua
- Abstract
Producing macrocyclic mesogens that are responsive to guest encapsulation presents a significant challenge. Cyclo[6]aramides, a type of macrocycle with a hydrogen-bond-constrained backbone, exhibit thermotropic lamellar, discotic nematic, hexagonal, and rectangular columnar mesophases over a considerably wide temperature range, including at room temperature. Additionally, cyclo[6]aramides show unusual mesophase transitions from lamellar to hexagonal columnar phase mediated by macrocyclic host-guest (H-G) interactions between the macrocycles and alkylammonium salts. The phase transition, triggered by an organic guest engaging in H-G interactions with a macrocyclic cavity, provides a novel strategy for manipulating the properties of liquid-crystalline materials. The crystal structure of a homologous cyclo[6]aramide reveals a disk-shaped, near-planar molecular backbone that facilitates intermolecular π-π stacking and leads to columnar assembly.
- Subjects
LIQUID crystalline solvents; PHASE transitions; MACROCYCLIC compounds; HYDROGEN bonding; MESOPHASES; CRYSTAL structure; INTERMOLECULAR interactions
- Publication
Angewandte Chemie, 2015, Vol 127, Issue 38, p11299
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201505278