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Intermolecular exciplex formation and photoinduced electron transfer of 1,8-naphthalimide dyads in methylated benzenes

Paper ID Volume ID Publish Year Pages File Format Full-Text
28150 44061 2007 9 PDF Available
Title
Intermolecular exciplex formation and photoinduced electron transfer of 1,8-naphthalimide dyads in methylated benzenes
Abstract

In methylated benzene (MB) solvents, 1,8-naphthalimide (NI) derivatives showed markedly red-shifted emission, which originated from an intermolecular exciplex formation between NI and MB in the singlet excited state. The exciplex emission shifted to longer wavelength according to an increase of the oxidation potential of MB. The Stokes shift of the exciplex emission obeyed Lippert–Mataga theory. On the other hand, the exciplex emission of 1,8-naphthalimide-linker-phenothiazine (NI-L-PTZ) dyads was markedly quenched by the linked PTZ. The transient absorption measurements were carried out to investigate the fast quenching process on NI-L-PTZ dyads in p-XYL/CH3CN. The NI radical ion is predominantly generated from the photoinduced electron transfer (PET) between the singlet excited NI and PTZ. The quantum yields for PET of NI-L-PTZ dyads in p-XYL/CH3CN were smaller than those in pure CH3CN. This indicates that the exciplex formation of NI-L-PTZ dyads with MB competitively occurs with the PET process.

Keywords
1,8-Naphthalimide; Exciplex; Photoinduced electron transfer; Methylated benzene; Phenothiazine
First Page Preview
Intermolecular exciplex formation and photoinduced electron transfer of 1,8-naphthalimide dyads in methylated benzenes
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 190, Issue 1, 5 July 2007, Pages 101–109
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering