Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 45, Pages 20161-20166Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202008736
Keywords
intermolecular interaction; molecular packing arrangement; Norbornyl; reversible photochromism; room-temperature phosphorescence
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Funding
- National Natural Science Foundation of China [21734009, 51933001]
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Herein, norbornyl (NB), a bulky annular nonconjugated spacer, is melded into pi systems to construct two groups of ladder-type room-temperature phosphorescence (RTP) luminogens. The effect of the NB on pi-pi interactions, packing modes and RTP performance is explored systematically. The experimental and computational results demonstrate the versatility of NB in reducing pi-pi distances and synergistically intensifying the intermolecular interactions, which not only induces intersystem crossing from S(1)to T(n)but also diminishes the nonradiative decay of triplet excitons. Impressively, 1800-fold phosphorescence lifetime enhancement is achieved in comparison with the reference compounds without NB. The molecular packing and RTP performance can be further modulated by the length of the backbones and terminal end-groups. It is quite peculiar that NB-annulated phthalic acid exhibits reversible photochromism in the solid state, likely due to the formation of persistent radical pairs. Our study paves an ingenious avenue towards enhancing intermolecular interactions and provides significant implications for a better comprehensive understanding of the origin of their RTP and the inherent photophysical mechanism.
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