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Science China Chemistry

, Volume 61, Issue 8, pp 940–946 | Cite as

Comparison of luminescent properties of helicene-like bibenzothiophenes with o-carborane and 5,6-dicarba-nido-decaborane

  • Kenta Nishino
  • Kazushi Hashimoto
  • Kazuo Tanaka
  • Yasuhiro Morisaki
  • Yoshiki Chujo
Articles
  • 84 Downloads

Abstract

This article describes comparison of the anchoring effect on electronic properties of the helicene-like bibenzothiophene between o-carborane and 5,6-dicarba-nido-decaborane. The o-carborane and nido-decaborane-fused bibenzothiophenes were simultaneously obtained in the same reaction and successfully isolated. Initially, the X-ray single crystal analysis revealed that the helicene-like distorted structure was realized in the nido-decaborane-fused bibenzothiophene. From optical measurements in the solution state, distinct different characteristics depending on the type of anchors were observed. It was summarized that the absorption and luminescent properties originated from weak π-conjugation at the bibenzothiophene moiety in the o-carborane-fused compound were obtained, whereas robust π-conjugation and significant emission from the intramolecular charge transfer state were detected from the nido-decaborane-fused compound. These data can be explained by the theoretical results that π-conjugation was restrictedly developed within the bibenzothiophene moiety in frontier orbitals of the o-carborane-fused compound. In contrast, π-conjugation can be constructed even through the distorted bibenzothiophene because of the nido-decaborane unit. Moreover, the intramolecular charge transfer state should be realized because of electronic interaction involving the nido-decaborane unit in the excited state. Furthermore, it was demonstrated that the nido-decaborane-fused compound possessed solid-state emission and mechanochromic luminescent properties. The π-conjugation on the distorted structure supported by the nido-decaborane anchor should play a significant role in suppressing aggregation-caused quenching followed by presenting solid-state emission with stimuli responsiveness.

Keywords

carborane helicene mechanochromism aggregation-induced emission 

Notes

Acknowledgements

This work was supported by Konica Minolta Science and Technology Foundation (for K.T.) and a Grant-in-Aid for Scientific Research on Innovative Areas “New Polymeric Materials Based on Element-Blocks (No.2401)” (JP24102013).

Supplementary material

11426_2018_9258_MOESM1_ESM.pdf (1.1 mb)
Comparison of Luminescent Properties of Helicene-Like Bibenzothiophenes with o-Carborane and 5,6-Dicarba-nido-Decaborane

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Polymer Chemistry, Graduate School of EngineeringKyoto UniversityKatsura KyotoJapan
  2. 2.Department of Applied Chemistry for Environment, School of Science and TechnologyKwansei Gakuin UniversitySanda HyogoJapan

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