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An Unusual Stacking Transformation in Liquid‐Crystalline Columnar Assemblies of Clicked Molecular Propellers with Tunable Light Emissions
Author(s) -
Kim Jinhee,
Cho Sung,
Cho ByoungKi
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201403297
Subject(s) - mesogen , stacking , materials science , tetraphenylethylene , zigzag , phase (matter) , phase transition , columnar phase , crystallography , liquid crystal , chemical physics , discotic liquid crystal , scattering , liquid crystalline , fluorescence , optics , optoelectronics , condensed matter physics , chemistry , aggregation induced emission , organic chemistry , physics , geometry , mathematics
The columnar liquid‐crystalline (LC) and fluorescence properties of three‐dimensional molecular propellers based on tetraphenylethylene is reported. X‐ray scattering studies reveal an unusual transition from a rectangular (Col rec ) to a hexagonal columnar (Col hex ) phase. In contrast to second‐order intercolumnar transitions based on a common tilt mechanism, the transition is first order and involves an unprecedented zigzag stacking of aromatic propellers in the Col rec phase. A sudden change in emission color from sky blue to green occurs rapidly and reversibly at this transition, which is due to the planarization of the propeller mesogen.