Abstract
Fluorescence turn-on diarylethenes (DAEs) are promising photoswitches for super-resolution bioimaging. However, all visible-light-driven photoswitchable DAEs are still rare. Here we report three D-A type visible-light-triggered fluorescence turn-on DAEs 1–3 by employing dibenzo[b,d]thiophene (DBTP) donor and 2,3-bis(2-methyl-1-benzothiophene-1,1-dioxide-3-yl)-thiophene (BTTO4) acceptor. It is found that the introduction of DBTP extends the molecular π-conjugation and increases the intramolecular charge-transfer character of BTTO4, which enables 1–3 open-isomers visible-light-triggered cyclization as well as turn-on fluorescence with a lifetime of 2.15–2.42 ns and relatively high PLQYs (0.18–0.21). All molecules show thermal stability, fatigue resistance, and photostability. Particularly, less than 20% degradation was observed for 1(c) and 2(c) after prolonged 405 nm light irradiation for 200 min. As a strong electron-donating group, DBTP offers new choices for the design of visible-light-driven fluorescence turn-on DAEs.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
