Reversible Stimuli-Induced Mechanofluorochromism by Molecular Assembly of <EM>o</EM>-Carborane
발표자
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초록
내용
A new type of mechanofluorochromism was observed in an AB2 type molecular array of silole-o-carborane in which meta- or para-positional isomer, Si-m-Cb or Si-p-Cb, was constructed by adding two o-carboranyl units to the 2,5-phenyl groups of silole. Each isomer showed different solid-state photoemission depending on its morphology; the crystals of meta- and para-isomer, CSi-m-Cb and CSi-p-Cb, cast yellow and blue emission, and mechanical grinding turned the emission blue and yellow for ASi-m-Cb and ASi-p-Cb, respectively. The solid-state photoemission studies revealed that the mechanofluorochromism is because of the electronic interaction between the silole and o-carborane units; yellow-colored fluorescence was reminiscent of such an interaction attributed to the charge transfer emission associated with a (silole)δ+ (o-carborane)δ− species.