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Article Dans Une Revue The European Physical Journal. Special Topics Année : 2023

Ultrafast formation of exciplex species in dicyanoanthracene ZSM-5 revealed by transient emission and fs IR vibrational spectroscopy

Résumé

The photophysical 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 S 1 state of DCA emitting bellow 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.

Domaines

Chimie
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Dates et versions

hal-04295919 , version 1 (20-11-2023)

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Lucie Duplouy, Matthieu Hureau, Aurélien Moncomble, Svetlana Mintova, Olivier Gardoll, et al.. Ultrafast formation of exciplex species in dicyanoanthracene ZSM-5 revealed by transient emission and fs IR vibrational spectroscopy. The European Physical Journal. Special Topics, 2023, 232 (13), pp.2145-2156. ⟨10.1140/epjs/s11734-023-00813-9⟩. ⟨hal-04295919⟩
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