Solvation controlled excited-state dynamics in a donor-acceptor phenazine-imidazole derivative

In the past few decades, significant efforts have been devoted to developing phenazine derivatives in various fields such as medicine, pesticides, dyes, and conductive materials owing to their highly Stokes-shifted fluorescence and distinctive photophysical properties. The modulation of the surround...

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Bibliographic Details
Published in:RSC advances 2024-05, Vol.14 (24), p.1771-1776
Main Authors: Shi, Hai-Xiong, Bao, Hong-Wei, Wu, Gui-Yuan
Format: Article
Language:English
Subjects:
Absorption spectra
Charge transfer
Chemistry
Dynamics
Emission spectra
Excitation
Fluorescence
Imidazole
Red shift
Solvation
Solvent effect
Solvents
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Summary:In the past few decades, significant efforts have been devoted to developing phenazine derivatives in various fields such as medicine, pesticides, dyes, and conductive materials owing to their highly Stokes-shifted fluorescence and distinctive photophysical properties. The modulation of the surrounding environment can effectively influence the luminescent behavior of phenazine derivatives, prompting us to investigate the solvent effect on the excited state dynamics. Herein, we present the solvent controlled excited state dynamics of a novel triphenylamine-based phenazine-imidazole molecule ( TPAIP ) through steady-state spectra and femtosecond transient absorption spectra. The fluorescence emission spectrum exhibited a redshift with increasing solvent polarity, indicating the existence of a charge transfer state. Furthermore, by tracking the femtosecond transient absorption spectra of TPAIP , we found that the nature of the relaxed S 1 state was strongly influenced by the solvent polarity: intersystem crossing character appears in apolar solvent, whereas intramolecular charge transfer character occurs in polar solvent because of solvation. These findings provide significant theoretical insights into the impact of solvents on the excited state dynamics within phenazine derivatives. This understanding supports diverse applications ranging from advanced biological probe design to photocatalysis and pharmaceutical research. We investigated the solvent-dependent excited state properties of a novel D-A molecule. As the solvent polarity increased, intersystem crossing disappeared, radiative transitions decreased, and charge transfer states were generated.
ISSN:2046-2069
2046-2069
DOI:10.1039/d4ra02417f