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- W2079833539 abstract "Quenching of fluoranthene (FA) singlets by tetrabromo-o-benzoquinone (TBBQ) and NNN′N′- tetramethyl-p-phenylenediamine (TMPD) was studied both in xylene solutions and in spin-cast polystyrene (PS) films. Emphasis was placed on time-resolved fluorescence transients resulting from pulsed excitation. Linear Stern–Volmer plots were obtained for quenching in solution and gave diffusion-controlled rate constants, of 1.45 × 1010 and 1.53 × 1010 dm3 mol–1s–1 for TBBQ and TMPD, respectively. TBBQ was found to quench FA singlets in PS over the studied concentration range 12 <[TBBQ]/mmol dm–3 <48, but in its presence FA singlets decayed non-exponentially. The results were interpreted quantitatively in terms of pure Förster's transfer from FA to TBBQ without diffusion of excitons. The critical transfer radius R0 was experimentally determined to be 24.3 Å, which is in good agreement with the theoretical value of 23 Å calculated from spectral data. Quenching of FA singlets in PS films was found to be independent of FA concentration over a 300–1200 mmol dm–3 FA concentration range for a constant TBBQ concentration of 24.0 mmol dm–3. TMPD was only slightly effective as a quencher of FA singlets in PS because it apparently behaves strictly as a contact quencher based on reversible charge transfer. The implications of these results for the design of systems intended to exploit light-induced electron transfer are discussed." @default.
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- W2079833539 date "1980-01-01" @default.
- W2079833539 modified "2023-09-26" @default.
- W2079833539 title "Light-induced electron transfer as compared with energy transfer in molecular thin-film systems" @default.
- W2079833539 doi "https://doi.org/10.1039/dc9807000311" @default.
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