Pressure-induced emission enhancement by restricting chemical bond vibration

Zhiyuan Fu, Haichao Liu, Jingyi Zhao, Xiangyu Zhang, Xiaoyan Zheng*, Bing Yang, Xinyi Yang, Kai Wang, Bo Zou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

In this work, we found that the pressure-induced emission enhancement (PIEE) phenomenon can be produced by the restriction of intramolecular chemical bond vibration, which differs from the mechanism of restricting intramolecular motion (RIM). Dibenzo[b,d]thiophene 5,5-dioxide (DBTS) is an aggregation-induced emission enhancement (AIEE) material. In the crystal state of DBTS, the high pressure strengthens intermolecular C-H⋯O S hydrogen bonds, which greatly restricts the vibration of C-H and S O bonds and then rigidifies the molecular skeleton, thereby suppressing the non-radiative process and promoting emission enhancement.In situhigh-pressure infrared spectroscopy and angle-dispersive X-ray diffraction analysis combined with reorganization energy and Hirshfeld surface theory calculation provide clear evidence that the restriction of the deformation vibration C-H bonds plays an essential role in PIEE, and S O bonds can act as the powerful controller that enhances intermolecular C-H⋯O S hydrogen bonds. This study introduces a new AIEE and PIEE fluorophore and provides deep insights into the influence of intermolecular interactions on intramolecular chemical bond vibration and luminescence, which will play an important role in the development of precision optical sensors.

Original languageEnglish
Pages (from-to)14578-14582
Number of pages5
JournalJournal of Materials Chemistry C
Volume9
Issue number41
DOIs
Publication statusPublished - 7 Nov 2021

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