The switchable phosphorescence and delayed fluorescence of a new rhodamine-like dye through allenylidene formation in a cyclometallated platinum(ii) system.

Autor: Zhao S; School of Chemistry and Chemical Engineering, Harbin Institute of Technology Harbin 15001 China.; Department of Chemistry, Southern University of Science and Technology 1088 Xueyuan Blvd. Shenzhen 518055 P. R. China keithwongmc@sustech.edu.cn., Zhu Y; Department of Chemistry, Southern University of Science and Technology 1088 Xueyuan Blvd. Shenzhen 518055 P. R. China keithwongmc@sustech.edu.cn., Li L; Department of Chemistry, Southern University of Science and Technology 1088 Xueyuan Blvd. Shenzhen 518055 P. R. China keithwongmc@sustech.edu.cn., Guerchais V; Univ Rennes, CNRS UMR6226 F-3500 Rennes France veronique.guerchais@univ-rennes1.fr julien.boixel@univ-rennes1.fr., Boixel J; Univ Rennes, CNRS UMR6226 F-3500 Rennes France veronique.guerchais@univ-rennes1.fr julien.boixel@univ-rennes1.fr., Wong KM; Department of Chemistry, Southern University of Science and Technology 1088 Xueyuan Blvd. Shenzhen 518055 P. R. China keithwongmc@sustech.edu.cn.
Jazyk: angličtina
Zdroj: Chemical science [Chem Sci] 2021 Jul 07; Vol. 12 (33), pp. 11056-11064. Date of Electronic Publication: 2021 Jul 07 (Print Publication: 2021).
DOI: 10.1039/d1sc02787e
Abstrakt: A new rhodamine-like alkyne-substituted ligand (Rhodyne) was designed to coordinate a cyclometallated platinum(ii) system. The chemo-induced "ON-OFF" switching capabilities on the spirolactone ring of the Rhodyne ligand with an end-capping platinum(ii) metal centre can modulate the interesting acetylide-allenylidene resonance. The long-lived 3 IL excited state of Rhodyne in its ON state as an optically active opened form was revealed via steady-state and time-resolved spectroscopy studies. Exceptional near-infrared (NIR) phosphorescence and delayed fluorescence based on a rhodamine-like structure were observed at room temperature for the first time. The position of the alkyne communication bridge attached to the platinum(ii) unit was found to vary the lead(ii)-ion binding mode and also the possible resonance structure for metal-mediated allenylidene formation. The formation of a proposed allenylidene resonance structure was suggested to rationalize these phenomena.
Competing Interests: There are no conflicts to declare.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE