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Title: Modulation of the cis‐ and trans‐Conformations in Bis‐o‐carborane Substituted Benzodithiophenes and Emission Enhancement Effect on Luminescent Efficiency by Solidification
Authors: Nishino, Kenta
Uemura, Kyoya
Tanaka, Kazuo  kyouindb  KAKEN_id
Morisaki, Yasuhiro
Chujo, Yoshiki
Author's alias: 上村, 京也
田中, 一生
森崎, 泰弘
中條, 善樹
Keywords: Carboranes
Aggregation‐induced emission
Solid‐state structures
Luminescence
Issue Date: 29-Mar-2018
Publisher: Wiley
Journal title: European Journal of Organic Chemistry
Volume: 2018
Issue: 12
Start page: 1507
End page: 1512
Abstract: Bis‐carborane‐substituted benzo[1, 2‐b:4, 5‐b′]dithiophenes (DCB‐R, where R = H, tBu) were synthesized and characterized. Their three‐dimensional conformations were tuned by introducing the tert‐butyl substituent at the para‐positions of the phenyl rings. Both molecules showed emission enhancement behavior, especially in the solid state. The emission quantum efficiencies were over 0.90 in the crystalline state. Moreover, it was shown that the efficiency of DCB‐tBu was over 0.70 in the amorphous state. From structural analyses and mechanistic investigations, it was proposed that the tert‐butyl substituents play a critical role in the formation of the trans‐conformation followed by suppression of aggregation‐caused quenching because of the o‐carborane units located at each plane of the benzodithiophene ring.
Rights: This is the accepted version of the following article: [Kenta Nishino, Kyoya Uemura, Kazuo Tanaka, Yasuhiro Morisaki, Yoshiki Chujo. Modulation of the cis‐ and trans‐Conformations in Bis‐o‐carborane Substituted Benzodithiophenes and Emission Enhancement Effect on Luminescent Efficiency by Solidification. European Journal of Organic Chemistry, 2018, 12, 1507-1512], which has been published in final form at https://doi.org/10.1002/ejoc.201701641. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.
The full-text file will be made open to the public on 30 March 2019 in accordance with publisher's 'Terms and Conditions for Self-Archiving'
This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/235029
DOI(Published Version): 10.1002/ejoc.201701641
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