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Your search keyword '"Meskers SCJ"' showing total 2 results
Start Over Author "Meskers SCJ" Topic photoluminescence
2 results on '"Meskers SCJ"'

1. Charge transfer kinetics in fullerene-oligomer-fullerene triads containing alkylpyrrole units

Author

Beckers, EHA, van Hal, PA, Dhanabalan, A, Meskers, SCJ, Knol, J, Hummelen, JC, Janssen, RAJ, Beckers, Edwin H.A., Meskers, Stefan C.J., Janssen, René A.J., Stratingh Institute of Chemistry, University of Groningen, Chemistry of (Bio)organic Materials and Devices, Macromolecular and Organic Chemistry, and Molecular Materials and Nanosystems

Subjects
Photoluminescence, Fullerene, PHOTOVOLTAIC DEVICES, Photochemistry, Photoinduced electron transfer, symbols.namesake, Condensed Matter::Materials Science, Ultrafast laser spectroscopy, Physics::Atomic and Molecular Clusters, Moiety, Physical and Theoretical Chemistry, Physics::Chemical Physics, PHOTOINDUCED ELECTRON-TRANSFER, LASER FLASH-PHOTOLYSIS, Chemistry, Acceptor, Gibbs free energy, DYAD, PHOTOPHYSICAL PROPERTIES, symbols, SEPARATION, SOLVENT DEPENDENCE, Absorption (chemistry), ENERGY-TRANSFER, C-60, FULLERENE-LINKED+OLIGOTHIOPHENES%22"><60>FULLERENE-LINKED OLIGOTHIOPHENES
Abstract

A photoinduced electron-transfer reaction has been observed in three fullerene−donor−fullerene triads containing an electron-rich pyrrole ring in the donor moiety. The kinetics of charge separation in solution has been investigated by photoluminescence and transient absorption spectroscopy. The polarity of solvent and the distance between donor and acceptor affect the forward electron-transfer reaction, in qualitative agreement with a semiempirical model for the Gibbs free energy for charge separation. Depending on the conditions, charge separation occurs at a rate of 109−1010 s-1. The charge recombination rate is estimated to be faster than 2 × 1010 s-1. The relatively large contribution of the singlet-excited-state Sn ← S1 absorption of the fullerene moiety to the photoinduced absorption hampered a more accurate determination of the recombination rate.

Published
2003

2. Photoinduced multistep energy and electron transfer in an oligoaniline-oligo(p-phenylene vinylene)-fullerene triad

Author

Ramos, AM, Meskers, SCJ, van Hal, PA, Knol, J, Hummelen, JC, Janssen, RAJ, Marcos Ramos, Alicia, Meskers, Stefan C.J., Janssen, René A.J., Stratingh Institute of Chemistry, University of Groningen, Chemistry of (Bio)organic Materials and Devices, Macromolecular and Organic Chemistry, and Molecular Materials and Nanosystems

Subjects
LASER FLASH-PHOTOLYSIS, Fullerene, Photoluminescence, Chemistry, ZINC PORPHYRIN, Triad (anatomy), Chromophore, PORPHYRIN-FULLERENE TRIAD, Photochemistry, Photoexcitation, Electron transfer, medicine.anatomical_structure, SELF-ASSEMBLED MONOLAYERS, Covalent bond, Phenylene, CHARGE RECOMBINATION DYNAMICS, N-METHYLFULLEROPYRROLIDINE, PHOTOPHYSICAL PROPERTIES, medicine, PHOTOCURRENT GENERATION, SOLVENT DEPENDENCE, Physical and Theoretical Chemistry, FULLERENE-LINKED+OLIGOTHIOPHENES%22"><60>FULLERENE-LINKED OLIGOTHIOPHENES
Abstract

A donor-donor-acceptor triad, OAn-OPV-C-60, With a redox gradient has been synthesized by covalently linking an oligoaniline (OAn), an oligo(p-phenylene vinylene) (OPV), and a fullerene (C-60) in a nonconjugated linear array. Photoluminescence and femtosecond pump-probe spectroscopy studies reveal that photoexcitation of any of the three chromophores of this triad in a polar solvent results in formation of the OAn(-)OPV(+)-C-60(-) charge-separated state, after an efficient ultrafast ( 1 ns) due to weak electronic coupling between the distant redox sites in the excited state. The stabilization gained is more than I order of magnitude in time. The experimental results are found to be in qualitative agreement with Marcus theory. In thin films, the OAn(+)-OPV-C-60(-) state is formed at a higher rate and in higher quantum yield than in solution.

Published
2003

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