https://doi.org/10.1140/epjs/s11734-023-00813-9
Regular Article
Ultrafast formation of exciplex species in dicyanoanthracene ZSM-5 revealed by transient emission and vibrational spectroscopy
1
UMR 8516, LASIRE-Laboratoire de Spectroscopie Pour Les Interactions, La Réactivité et L’Environnement, Univ. Lille, CNRS, 59000, Lille, France
2
Laboratoire Catalyse et Spectrochimie (LCS) ENSICAEN, UNICAEN, CNRS, Normandie Université, 6 Boulevard Maréchal Juin, 14050, Caen, France
3
UMR 8181, UCCS-Unité de Catalyse et Chimie du Solide, Univ. Lille, CNRS, Bât. C3, 59650, Villeneuve d’Ascq Cedex, France
g
vincent.de-waele@univ-lille.fr
Received:
19
August
2022
Accepted:
10
March
2023
Published online:
13
April
2023
The photo-physical properties of dicyanoanthracene (DCA) molecules adsorbed on the external surface of ZSM-5 zeolite, forming DCA@ZSM-5 composites, have been investigated by picosecond transient emission, femtosecond transient absorption infrared vibrational spectroscopy, steady-state UV–vis, and quantum chemistry calculations. Following the photoexcitation at 420 nm of DCA@ZSM-5, the formation of the localized, LE, excited S1 state of DCA emitting below 500 nm is observed. LE is rapidly and quasi-exclusively converted into two distinct exciplex species, EX1 and EX2, detected by their emission above 520 nm, with a lifetime of 5 ns and 20 ns, respectively. The different transient species can be identified by the frequency of the CN stretching vibration that is a marker of the charge delocalisation and that is peaking respectively at 2162 (LE), 2174 (EX1) and 2187 (EX2) cm−1. DFT and TD-DFT calculations further support the assignment. The results show that the external surface of zeolite is an appropriate playground for the development of novel photoactive host–guest materials.
Ultrafast Phenomena from attosecond to picosecond timescales: theory and experiments. Guest editors: Franck Lépine, Lionel Poisson.
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