Circularly Polarized Laser Emission from Homochiral Superstructures based on Achiral Molecules with Conformal Flexibility

Autor: Zheng‐Fei Liu, Jiahuan Ren, Pan Li, Li‐Ya Niu, Qing Liao, Shaodong Zhang, Qing‐Zheng Yang
Rok vydání: 2022
Předmět:
Zdroj: Angewandte Chemie. 135
ISSN: 1521-3757
0044-8249
Popis: Without external chiral intervention, it is a challenge to form homochirality from achiral molecules with conformational flexibility. We here report on a rational strategy that uses multivalent noncovalent interactions to clamp the molecular conformations of achiral D-A molecules. These interactions overcome the otherwise dominant dipole-dipole interactions and thus disfavor their symmetric antiparallel stacking. It in turn facilitates parallel packing, leading to spontaneous symmetry breaking during crystallization and thus the formation of homochiral conglomerates. When this emergent homochirality is coupled with optical gain characteristics of the molecules, the homochiral crystals are explored as excellent circularly polarized micro-lasers with low lasing threshold (16.4 μJ cm
Databáze: OpenAIRE
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