Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 25, Issue 34, Pages 8149-8156Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201901305
Keywords
bis-o-carboranyl silole; charge transfer emission; mechanofluorochromism; silole local emission; solid-state molecular arrays; structure-property relationships
Categories
Funding
- National Research Foundation of Korea (NRF) - Ministry of Education [NRF-2014R1A6A1030732, NRF-2016R1D1A3B03934670, NRF-2016R1D1A3B03936414]
- Functional Districts of the Science Belt support program, Ministry of Science, ICT and Future Planning [2015K000287]
- Korea Research Institute of Chemical Technology (KRICT)
Ask authors/readers for more resources
A new type of solid-state photochromism was observed in an AB(2)-type molecular assembly comprising a central silole and two peripheral o-carborane units, and in this assembly, depending on the assembling positions of those units at the adjoining benzene ring, two different regioisomers were formed: Si-m-Cb and Si-p-Cb. Each isomer showed different solid-state photochromism depending on its solid-state molecular conformation and was either in the crystalline or amorphous state. The crystals of each meta- or para-isomer, CSi-m-Cb or CSi-p-Cb, showed yellow or blue emission, and mechanically grinding those crystals into amorphous powders of A(Si-m-Cb) and A(Si-p-Cb), switched their emissions to blue and yellow, respectively. Photophysical studies revealed that the electronic interaction between silole and o-carborane units determined the emission color. The crystal and DFT-optimized structures each account for the crystalline and amorphous structures, respectively, and are correlated well with the electronic interactions in the molecular assembly in the solid state, thus enabling the prediction of the solid-state molecular conformational change.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available