کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
26869 43983 2012 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synergistic effect of trimethylsilane for photoinduced electron transfer on 1,8-naphthalimides in polar solvent
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
Synergistic effect of trimethylsilane for photoinduced electron transfer on 1,8-naphthalimides in polar solvent
چکیده انگلیسی

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.

Figure optionsDownload 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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 246, 15 October 2012, Pages 23–28
نویسندگان
, , , , , ,