Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 31, Pages 12822-12826Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202005785
Keywords
ACQ-to-AIE transformation; aggregation-induced emission; cross packing; regioisomerization; two-photon imaging
Categories
Funding
- National Natural Science Foundation of China [51903052]
- Shanghai Pujiang Project [19PJ1400700]
- Zhejiang Provincial Natural Science Foundation of China [LR17F050001]
- National Science Foundation of China [21788102, 21805002, 61735016, 61975172]
- Research Grants Council of Hong Kong [16305518, N-HKUST609/19, A-HKUST605/16, AoE/P-01/12, C6009-17G]
- Innovation and Technology Commission [ITC-CNERC14SC01, ITCPD/17-9]
- Science and Technology Plan of Shenzhen [JCYJ20180507183832744, JCYJ20180306180231853]
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The traditional design strategies for highly bright solid-state luminescent materials rely on weakening the intermolecular pi-pi interactions, which may limit diversity when developing new materials. Herein, we propose a strategy of tuning the molecular packing mode by regioisomerization to regulate the solid-state fluorescence. TBP-e-TPA with a molecular rotor in the end position of a planar core adopts a long-range cofacial packing mode, which in the solid state is almost non-emissive. By shifting molecular rotors to the bay position, the resultant TBP-b-TPA possesses a discrete cross packing mode, giving a quantum yield of 15.6 +/- 0.2 %. These results demonstrate the relationship between the solid-state fluorescence efficiency and the molecule's packing mode. Thanks to the good photophysical properties, TBP-b-TPA nanoparticles were used for two-photon deep brain imaging. This molecular design philosophy provides a new way of designing highly bright solid-state fluorophores.
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