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Front Cover: Solid‐State Thermochromic Luminescence through Twisted Intramolecular Charge Transfer and Excimer Formation of a Carborane−Pyrene Dyad with an Ethynyl Spacer (Asian J. Org. Chem. 12/2017)
Author(s) -
Nishino Kenta,
Yamamoto Hideki,
Tanaka Kazuo,
Chujo Yoshiki
Publication year - 2017
Publication title -
asian journal of organic chemistry
Language(s) - English
Resource type - Reports
SCImago Journal Rank - 0.846
H-Index - 44
eISSN - 2193-5815
pISSN - 2193-5807
DOI - 10.1002/ajoc.201700647
Subject(s) - excimer , intramolecular force , chemistry , pyrene , luminescence , photochemistry , carborane , thermochromism , crystallography , stereochemistry , fluorescence , optoelectronics , organic chemistry , materials science , optics , physics
Orange to green at 77 K : An o ‐carborane–pyrene dyad with an ethynyl spacer group has been synthesized. Based on optical measurements, it was found that the o ‐carborane dyad can exhibit solid‐state emission as well as thermochromic luminescence between orange and green. This reversible change occurred due to the switching of the emission mechanism between intramolecular charge transfer and excimer formation. This study demonstrates that the o ‐carborane–ethynyl unit can play a significant role in suppression of concentration quenching without disturbance to the excimer formation. More information can be found in the Full Paper by Kazuo Tanaka and Yoshiki Chujo et al. on page 1818 in Issue 12, 2017 (DOI: 10.1002/ajoc.201700390).