کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
28013 44056 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Photoinduced electron transfer dynamics in porphyrin donor dyads
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
Photoinduced electron transfer dynamics in porphyrin donor dyads
چکیده انگلیسی

Intramolecular photoinduced electron transfer (PET) processes occurring in dyads with a free base porphyrin-tetraazaanthracene donor (P) and either a tetracyanonaphthoquinidodimethane (TCQ) or benzoquinone (BQ) acceptor linked by a rigid six σ-bond polynorbornane bridge ([6]) have been investigated. For P[6]BQ, PET in the polar solvent benzonitrile (ɛs = 25.9) occurs with a rate constant (kPET) of 1.6 × 108 s−1 but is not evident in solvents less polar than tetrahydrofuran (ɛs = 7.52). For P[6]TCQ, highly efficient forward PET occurs in both polar and non-polar solvents (kPET > 2 × 1010 s−1). For P[6]TCQ the lifetime of the resulting charge-separated state decreases markedly with increasing solvent polarity. The results are discussed in the context of the likely mechanisms for electronic coupling and current theories for PET processes in such linked molecular systems.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 197, Issues 2–3, 25 June 2008, Pages 220–225
نویسندگان
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