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

Paper ID Volume ID Publish Year Pages File Format Full-Text
26869 43983 2012 6 PDF Available
Title
Synergistic effect of trimethylsilane for photoinduced electron transfer on 1,8-naphthalimides in polar solvent
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.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The photoinduced electron transfer (PET) of 1,8-naphthalimide (NI) dyad are investigated. ► NIlinkerTMS dyad produced the NI radical anion (NI−) in the excited states. ► The proton abstraction process occurred from NI− to generate the NI ketyl radical (NIH) in protic polar solvent. ► TMS group plays an inductive role as the electron donor of sulfur containing linker in PET process.

Keywords
1,8-Naphthalimide; Photoinduced electron transfer; Transient absorption spectroscopy; DFT calculation
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Synergistic effect of trimethylsilane for photoinduced electron transfer on 1,8-naphthalimides in polar solvent
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 246, 15 October 2012, Pages 23–28
Authors
, , , , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us