Quenching mechanism in a highly exothermic region of the Rehm-Weller relationship for electron-transfer fluorescence quenching

Kikuchi, Kôichi; Niwa, Taeko; Takahashi, Yasutake; Ikeda, Hiroshi; Miyashi, Tsutomu

doi:10.1021/j100121a037

Cited by 88 publications

(68 citation statements)

References 3 publications

(3 reference statements)

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“…37 From this expression, CR of Pe •+ /DCB •-(∆G CR ) -2.62 eV) is substantially more exergonic than that of Pe •+ /DCE •-(∆G CR ) -2.34 eV). As CR of such ion pairs is well-known to exhibit the inverted behavior predicted by Marcus ET theory, 38,[41][42][43] it can be expected to be substantially slower with Pe •+ /DCB •-than with Pe •+ /DCE •-, as observed.…”

Section: Resultsmentioning

confidence: 96%

“…These values, which are essentially independent of the quencher concentration, agree well with those reported in the literature and obtained using a different technique. 36,37 Pump-Probe Transient Absorption (TA). The time evolution of Pe •+ population, after excitation of Pe at 400 or 355 nm in the presence of 0.1 M quencher, has been monitored by measuring the absorbance around 530 nm.…”

Section: Resultsmentioning

confidence: 99%

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Ultrafast Excited State Dynamics of the Perylene Radical Cation Generated upon Bimolecular Photoinduced Electron Transfer Reaction

2006

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The ultrafast ground state recovery (GSR) dynamics of the radical cation of perylene, Pe•+, generated upon bimolecular photoinduced electron transfer in acetonitrile, has been investigated using pump−pump−probe spectroscopy. With 1,4-dicyanobenzene as electron acceptor, the free ion yield is substantial and the GSR dynamics of Pe•+ was found to depend on the time delay between the first and second pump pulses, Δt12, i.e., on the "age" of the ion. At short Δt12, the GSR dynamics is biphasic, and at Δt12 larger than about500 ps, it becomes exponential with a time constant around 3 ps. With trans-1,2-dicyanoethylene as acceptor, the free ion yield is essentially zero and the GSR dynamics of Pe•+ remains biphasic independently of Δt12. The change of dynamics observed with 1,4-dicyanobenzene is ascribed to the transition from paired to free solvated ion, because in the pair, the excited ion has an additional decay channel to the ground state, i.e., charge recombination followed by charge separation. The rate constants deduced from the analysis of these GSR dynamics are all fully consistent with this hypothesis

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Section: Resultsmentioning

confidence: 96%

Section: Resultsmentioning

confidence: 99%

Ultrafast Excited State Dynamics of the Perylene Radical Cation Generated upon Bimolecular Photoinduced Electron Transfer Reaction

2006

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“…Since one of the species is neutral and the solvent used is polar in nature, the coulombic term in the above expression is neglected [78]. The DG et value was calculated as À0.89 eV and this higher negative value indicates the electron transfer process is thermodynamically favorable [79,80].…”

Section: Calculation Of Free Energy Change (Dg Et ) For the Electron mentioning

confidence: 99%

Photosensitization of colloidal TiO2 nanoparticles with phycocyanin pigment

Kathiravan

Renganathan

2009

Journal of Colloid and Interface Science

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“…The calculated value of ∆G et is −2.71eV. The negative sign of ZnO nanoparticles specifies the thermodynamic feasibility of electron transfer process [37].…”

Section: Energeticsmentioning

confidence: 87%

Enhancement of Photosensitization Behavior of 1-(4-fluorophenyl)-2-(naphthalen-1-yl)-4, 5-diphenyl-1H-imidazole by Nanocrystalline ZnO

Kalaiarasi¹,

Ashok²,

Prabakaran³

2018

DJ JECF

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1 H NMR, 13 C NMR, mass spectral and elemental analysis data are used to synthesize and characterize photosensitive imidazole derivative of 1-(4-Fluorophenyl)-2-(Naphthalen-1-yl)-4, 5-Diphenyl-1H-Imidazole [FNDI]. Nano crystalline ZnO synthesized by sol-gel method is characterized by absorption (UV), fluorescence (PL), Fourier-Transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM) and Energy Dispersive X ray Spectroscopy (EDS). The nanocrystalline ZnO surface is bounded by the imidazole derivative. Fluorescence enhancement is explained based on Photo-induced Electron Transfer (PET) method, and calculation of apparent binding constant is done. Due to the ligand adsorption on the ZnO nanoparticle, the LUMO and HOMO energy levels of imidazole derivative are lowered, and strong adsorption occurs due to the chemical affinity between the N 2 atom of the imidazole derivative and the Zn ion. Fluorescence enhancement occurs due to the electron injection from photo excited imidazole derivative to the ZnO conduction band.

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Quenching mechanism in a highly exothermic region of the Rehm-Weller relationship for electron-transfer fluorescence quenching

Cited by 88 publications

References 3 publications

Ultrafast Excited State Dynamics of the Perylene Radical Cation Generated upon Bimolecular Photoinduced Electron Transfer Reaction

Ultrafast Excited State Dynamics of the Perylene Radical Cation Generated upon Bimolecular Photoinduced Electron Transfer Reaction

Photosensitization of colloidal TiO2 nanoparticles with phycocyanin pigment

Enhancement of Photosensitization Behavior of 1-(4-fluorophenyl)-2-(naphthalen-1-yl)-4, 5-diphenyl-1H-imidazole by Nanocrystalline ZnO

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