Synergistic effect of trimethylsilane for photoinduced electron transfer on 1,8-naphthalimides in polar solvent

Title
Synergistic effect of trimethylsilane for photoinduced electron transfer on 1,8-naphthalimides in polar solvent
Author(s)
조대원조대원[조대원]박혜정[박혜정]윤웅찬[윤웅찬]이명희[이명희]임찬[임찬]
Keywords
ELECTROCHEMICAL OXIDATION; 1,8-NAPHTHALIMIDE-LINKER-PHENOTHIAZINE DYADS; ORGANOSILICON COMPOUNDS; DIIMIDE DERIVATIVES; EXCIMER FORMATION; DNA; PHOTOCHEMISTRY; NAPHTHALIMIDES; NAPHTHALENE; PHOTOLYSIS
Issue Date
201210
Publisher
ELSEVIER SCIENCE SA
Citation
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, v.246, pp.23 - 28
Abstract
Photoinduced electron-transfer (PET) process of 1,8-naphthalimide-linker-TMS (NI-SOS-TMS, 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 NI-SOS-TMS produced the NI radical anion (NI center dot-) with a transient absorption band around 415 nm, via the intramolecular PET from heteroatom nearby TMS to NI in the singlet excited (S-1) state. However, in case of NI-SOS, the transient band at around 415 nm increased concomitantly with the decay of (NI)-N-1* (or (NI)-N-3*) at around 470 nm. This is implied that NI center dot- is primarily generated via the intermolecular quenching of (NI)-N-1* (or (NI)-N-3*) by NI. In contrast, in a protic polar solvent mixture of CH3CN/H2O, a proton abstraction process occurred from NI center dot- to generate the NI ketyl radical (NIH center dot), which showed a transient absorption band around 405 nm. The decay time constants of NIH center dot were quite long compared to those of NI center dot- in CH3CN. Both the rates of charge transfer and deactivation processes of transient species largely depended on the protic polar solvent. (C) 2012 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/27093http://dx.doi.org/10.1016/j.jphotochem.2012.07.008
ISSN
1010-6030
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이과대학 > 화학생화학부 > Articles
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