Title of article :
Synergistic effect of trimethylsilane for photoinduced electron transfer on 1,8-naphthalimides in polar solvent
Author/Authors :
Cho، نويسنده , , Dae Won and Cho، نويسنده , , Dae Won and Park، نويسنده , , Hea Jung and Yoon، نويسنده , , Ung Chan and Lee، نويسنده , , Myoung Hee and Im، نويسنده , , Chan، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2012
Pages :
6
From page :
23
To page :
28
Abstract :
Photoinduced electron-transfer (PET) process of 1,8-naphthalimidelinkerTMS (NISOSTMS, where SOS = dithiaoxaundecyl and TMS = trimethylsilane) has been investigated using transient absorption measurements in CH3CN and CH3CN/H2O (v/v = 9:1). The femtosecond pulsed laser excitation of NISOSTMS produced the NI radical anion (NI−) with a transient absorption band around 415 nm, via the intramolecular PET from heteroatom nearby TMS to NI in the singlet excited (S1) state. However, in case of NISOS, the transient band at around 415 nm increased concomitantly with the decay of 1NI* (or 3NI*) at around 470 nm. This is implied that NI− is primarily generated via the intermolecular quenching of 1NI* (or 3NI*) by NI. In contrast, in a protic polar solvent mixture of CH3CN/H2O, a proton abstraction process occurred from NI− to generate the NI ketyl radical (NIH), which showed a transient absorption band around 405 nm. The decay time constants of NIH were quite long compared to those of NI− in CH3CN. Both the rates of charge transfer and deactivation processes of transient species largely depended on the protic polar solvent.
Keywords :
DFT calculation , 1 , 8-Naphthalimide , photoinduced electron transfer , Transient absorption spectroscopy
Journal title :
Journal of Photochemistry and Photobiology:A:Chemistry
Serial Year :
2012
Journal title :
Journal of Photochemistry and Photobiology:A:Chemistry
Record number :
1627114
Link To Document :
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