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Cover Feature: Control of Axial Chirality by Planar Chirality Based on Optically Active [2.2]Paracyclophane (Chem. Eur. J. 65/2020)
Author(s) -
Namba Genki,
Mimura Yuki,
Imai Yoshitane,
Inoue Ryo,
Morisaki Yasuhiro
Publication year - 2020
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.202004191
Subject(s) - chirality (physics) , planar chirality , planar , molecule , benzene , axial chirality , excited state , crystallography , materials science , stereochemistry , chemistry , molecular physics , physics , enantioselective synthesis , atomic physics , chiral symmetry , organic chemistry , computer science , catalysis , quantum mechanics , computer graphics (images) , nambu–jona lasinio model , quark
Chiral X‐shaped molecules based on the planar chiral [2.2]paracyclophane have been prepared, in which di(methoxy)terphenyl units are stacked on the central benzene rings. At 25 °C, methoxyphenyl rings freely rotate in solution, while at −120 °C, their rotary motion is suppressed in the excited state. The X‐shaped molecules emit CPL at 25 °C in solution with a large g lum value. On the other hand, at −120 °C, dual CPL emission with opposite signs is observed. The axial chirality is controlled by the planar chirality at low temperature, leading ultimately to propeller chirality. More information can be found in the Full Paper by Y. Morisaki et al. on page 14871.