TY  - JOUR
A1  - Dosche, Carsten
A1  - Kumke, Michael Uwe
A1  - Ariese, Freek
A1  - Bader, Arjen N.
A1  - Gooijer, Cees
A1  - Dosa, P. I.
A1  - Han, S.
A1  - Miljanic, Ognjen S.
A1  - Vollhardt, K. Peter C.
A1  - Puchta, Ralph
A1  - Hommes, N. J. R. V.
T1  - Shpol'skii spectroscopy and vibrational analysis of [N]phenylenes
Y1  - 2003
ER  - 
TY  - JOUR
A1  - Dosche, Carsten
A1  - Löhmannsröben, Hans-Gerd
A1  - Bieser, A.
A1  - Dosa, P. I.
A1  - Han, S.
A1  - Iwamoto, M.
A1  - Schleifenbaum, A.
A1  - Vollhardt, K. Peter C.
T1  - Photophysical properties of [N]phenylenes
Y1  - 2002
ER  - 
TY  - GEN
A1  - Dosche, Carsten
A1  - Mickler, Wulfhard
A1  - Löhmannsröben, Hans-Gerd
A1  - Agenet, Nicolas
A1  - Vollhardt, K. Peter C.
T1  - Photoinduced electron transfer in [N]phenylenes
N2  - First studies of electron transfer in [N]phenylenes were performed in bimolecular quenching reactions of angular [3]- and triangular [4]phenylene with various electron acceptors. The relation between the quenching rate constants kq and the free energy change of the electron transfer (ΔG0CS ) could be described by the Rehm-Weller equation. From the experimental results, a reorganization energy λ of 0.7 eV was derived. Intramolecular electron transfer reactions were studied in an [N]phenylene bichomophore and a corresponding reference compound. Fluorescence lifetime and quantum yield of the bichromophor display a characteristic dependence on the solvent polarity, whereas the corresponding values of the reference compound remain constant. From the results, a nearly isoenergonic ΔG0CS can be determined. As the triplet quantum yield is nearly independent of the polarity, charge recombination leads to the population of the triplet state.
T3  - Zweitveröffentlichungen der Universität Potsdam : Mathematisch-Naturwissenschaftliche Reihe - 23 
KW  - [N]phenylenes
KW  - photoinduced electron transfer
KW  - [N]phenylene dyads
Y1  - 2007
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:kobv:517-opus-12463
ER  - 
TY  - JOUR
A1  - Dosche, Carsten
A1  - Mickler, Wulfhard
A1  - Löhmannsröben, Hans-Gerd
A1  - Agenet, Nicolas
A1  - Vollhardt, K. Peter C.
T1  - Photoinduced electron transfer in [N]phenylenes
N2  - First studies of electron transfer in [N]phenylenes were performed in bimolecular quenching reactions of angular [3]- and triangular [4]phenylene with various electron acceptors. The relation between the quenching rate constants k(q) and the free energy change of the electron transfer (Delta G(CS)(0)) could be described by the Rehm- Weller equation. From the experimental results, a reorganization energy lambda of 0.7 eV was derived. Intramolecular electron transfer reactions were studied in an [N]phenylene bichomophore and a corresponding reference compound. Fluorescence lifetime and quantum yield of the bichromophor display a characteristic dependence on the solvent polarity, whereas the corresponding values of the reference compound remain constant. From the results, a nearly isoenergonic charge separation process can be determined. As the triplet quantum yield is nearly independent of the polarity, charge recombination leads to the population of the triplet state.
Y1  - 2007
UR  - http://www.sciencedirect.com/science/journal/10106030
U6  - https://doi.org/10.1016/j.jphotochem.2006.12.038
SN  - 1010-6030
ER  - 
TY  - JOUR
A1  - Dosche, Carsten
A1  - Kumke, Michael Uwe
A1  - Löhmannsröben, Hans-Gerd
A1  - Ariese, Freek
A1  - Bader, Arjen N.
A1  - Gooijer, Cees
A1  - Miljanic, Ognjen S.
A1  - Iwamoto, M.
A1  - Vollhardt, K. Peter C.
A1  - Puchta, Ralph
A1  - Hommes, N. J. R. V.
T1  - Deuteration effects on the vibronic structure of the fluorescence spectra and the internal conversion rates of triangular [4]phenylene
N2  - Deuteration effects on the vibronic structure of the emission and excitation spectra of triangular [ 4] phenylene (D-3h [4]phenylene) were studied using laser-excited Shpol'skii spectroscopy (LESS) in an octane matrix at 4.2 K. For correct assignment of the vibrational modes, the experimental results were compared with calculated frequencies (B3LYP/6-31G*). CH vibrations were identified by their characteristic isotopic shifts in the spectra of deuterated triangular [4]phenylenes. Two CC stretching modes, at 100 cm(-1) and 1176 cm(-1), suitable as probes for bond strength changes in the excited state, were identified. The isotope effect on the internal conversion rates of triangular [4] phenylene was evaluated from measurements of temperature dependent lifetime. Isotope dependency and the magnitude of the internal conversion rates indicate that internal conversion in triangular [4] phenylene is most likely induced by CH vibrations. The results obtained by LESS and lifetime measurements were compared with PM3 PECI calculations of the excited state structure. The theoretical results and the relation between ground and excited state vibration energies of the 1176 cm(-1) probe vibration indicate a reduction of bond alternation of the central cyclohexatriene ring in the excited state
Y1  - 2004
SN  - 1463-9076
ER  -