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The butterfly effect in bisfluorenylidene-based dihydroacenes: aggregation induced emission and spin switching

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Abstract

Linear acenes are a well-studied class of polycyclic aromatic hydrocarbons and their established physical properties have led to their widespread application across the field of organic electronics. However, their quinoidal forms – dihydroacenes – are much less explored and exhibit vastly different photophysical and electronic properties due to their non-planar, cross-conjugated nature. In this work, we present a series of difluorenylidene dihydroacenes which exhibit a butterfly-like structure with a quinoidal skeleton, resulting in comparatively higher optical gaps and lower redox activities than those of their planar analogs. We found that these compounds exhibit aggregation induced emission (AIE), activated through restriction of the “flapping” vibrational mode of the molecules in the solid state. Furthermore, anthracene-containing dihydroacenes exhibit thermally activated ground-state spin switching as evidenced by planarization of the acene core and diradical activity recorded by EPR. These two characteristics in this relatively unexplored class of materials provide new insights for the design of multifunctional materials.

Graphical abstract: The butterfly effect in bisfluorenylidene-based dihydroacenes: aggregation induced emission and spin switching

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Publication details

The article was received on 16 Aug 2019, accepted on 04 Oct 2019 and first published on 07 Oct 2019


Article type: Edge Article
DOI: 10.1039/C9SC04096J
Chem. Sci., 2019, Advance Article
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    The butterfly effect in bisfluorenylidene-based dihydroacenes: aggregation induced emission and spin switching

    X. Yin, J. Z. Low, K. J. Fallon, D. W. Paley and L. M. Campos, Chem. Sci., 2019, Advance Article , DOI: 10.1039/C9SC04096J

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