Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/15720
Title: Femtosecond broadband time-resolved fluorescence and transient absorption study of the intramolecular charge transfer state of methyl 4-dimethylaminobenzoate
Authors: Chan, CTL
Cheng, CCW
Ho, KYF
Kwok, WM 
Issue Date: 2011
Publisher: Royal Soc Chemistry
Source: Physical chemistry chemical physics, 2011, v. 13, no. 36, p. 16306-16313 How to cite?
Journal: Physical Chemistry Chemical Physics 
Abstract: A combined application of femtosecond broadband time-resolved fluorescence (fs-TRF), fluorescence anisotropy (fs-TRFA) and fs to microsecond (mu s) transient absorption (TA) have been used to probe directly the dynamics, nature, formation and decay paths of the singlet intramolecular charge transfer ((ICT)-I-1) state of methyl 4-dimethylaminobenzoate (1a) in acetonitrile. The result reveals explicit evidence for a common electronic origin (the L-a nature) of the (ICT)-I-1 state and its precursor the locally excited ((LE)-L-1) state to account jointly for the dual florescence known to this system. It also shows that the ICT reaction from the (LE)-L-1 to (ICT)-I-1 state occurs with time constant of similar to 0.8 ps and the (ICT)-I-1 state formed decays with a similar to 1.9 ns time constant leading mainly to a pi pi* natured triplet state (T-3(1)). The T-3(1) then relaxes with a similar to 4 mu s lifetime under deoxygenated condition resulting in full recovery of the ground state (S-0). As a case study, this work contributes novel experimental data for improved understanding of the mechanism of ICT reaction; it also reveals a distinct deactivation pattern for this prototype para-amino substituted aromatic carbonyl compound in acetonitrile.
URI: http://hdl.handle.net/10397/15720
ISSN: 1463-9076
DOI: 10.1039/c1cp21627a
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