ChemRxiv
These are preliminary reports that have not been peer-reviewed. They should not be regarded as conclusive, guide clinical practice/health-related behavior, or be reported in news media as established information. For more information, please see our FAQs.
1/1
4 files

A Synergy Between Push-Pull Electronic Effect and Twisted Conformation for High-Contrast Mechanochromic AIEgens

preprint
submitted on 24.07.2020 and posted on 24.07.2020 by Xiaoxuan Wang, Chunxuan Qi, Zhiyuan Fu, Haoke Zhang, Jianguo Wang, Hai-Tao Feng, Kai Wang, Bo Zou, Jacky W. Y. Lam, Ben Zhong Tang
Mechanochromic (MC) luminogens in response to external stimulus have shown promising applications as pressure sensors and memory devices. While, research on their underlying mechanism is still in the initial stage. Here, three pyridinium-functionalized tetraphenylethylenes bearing n-pentyloxy group, hydrogen, nitro group, namely TPE-OP, TPE-H and TPE-NO, are designed to systematically investigate the influence of push-pull electronic effect and molecular conformation on MC luminescence. Upon anisotropic grinding and isotropic hydrostatic compression, TPE-OP with strong intramolecular charge transfer (ICT) affords the best MC behavior among them. Analysis of three polymorphs of TPE-H clearly indicates that planarization of molecular conformation is responsible for their bathochromic shift under mechanical stimuli. Theoretical calculations also verify that high twisting stress of AIEgens can be released under high pressure. This study presents a clear picture for MC behaviour and proposes an effective strategy to achieve high-contrast MC luminescence.

History

Email Address of Submitting Author

haitaofeng907@163.com

Institution

Baoji University of Arts and Sciences

Country

China

ORCID For Submitting Author

0000-0003- 2388-0955

Declaration of Conflict of Interest

The authors declare no competing interests

Exports

Logo branding

Exports