Issue 42, 2023

Realizing long range π-conjugation in phenanthrene and phenanthrene-based molecular crystals for anomalous piezoluminescence

Abstract

Unlike the known aggregation-caused quenching (ACQ) that the enhancement of π–π interactions in rigid organic molecules usually decreases the luminescent emission, here we show that an intermolecular “head-to-head” π–π interaction in the phenanthrene crystal, forming the so-called “transannular effect”, could result in a higher degree of electron delocalization and thus photoluminescent emission enhancement. Such a transannular effect is molecular configuration and stacking dependent, which is absent in the isomers of phenanthrene but can be realized again in the designed phenanthrene-based cocrystals. The transannular effect becomes more significant upon compression and causes anomalous piezoluminescent enhancement in the crystals. Our findings thus provide new insights into the effects of π–π interactions on luminescence emission and also offer new pathways for designing efficient aggregation-induced emission (AIE) materials to advance their applications.

Graphical abstract: Realizing long range π-conjugation in phenanthrene and phenanthrene-based molecular crystals for anomalous piezoluminescence

Supplementary files

Article information

Article type
Edge Article
Submitted
01 8 2023
Accepted
02 10 2023
First published
09 10 2023
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2023,14, 11629-11637

Realizing long range π-conjugation in phenanthrene and phenanthrene-based molecular crystals for anomalous piezoluminescence

T. Xu, X. Yin, C. Zhai, D. Chen, X. Yang, S. Hu, K. Hu, Y. Shang, J. Dong, Z. Yao, Q. Li, P. Wang, R. Liu, M. Yao and B. Liu, Chem. Sci., 2023, 14, 11629 DOI: 10.1039/D3SC04006B

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