By Douglas C. Neckers, William S. Jenks, Thomas Wolff
Content material: Ensemble Photophysics of inflexible Polyphenylene dependent Dendritic constructions (M. Lor, G. Schweitzer, M. Van Der Auweraer, J. Hofkens, and F. C. De Schryver). Photochemistry of Short-Lived Species utilizing Multibeam Irradiation (Mamoru Fujitsuka and Tetsuro Majma). Two-Photon actual, natural, and Polymer Chemistry: thought, strategies, Chromophore layout, and functions (Bernd Strehmel and Veronika Strehmel). Index. Cumulative Index Volumes
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6) yields too small values of dDA. 8 nm from molecular modeling structures. The only reason for this large discrepancy can be the wrongly estimated value of R0 due to the too simplified assumption of the dipole–dipole orientation factor k2 value of 2/3, which is strictly valid only for a random orientation of the chromophores. Here, this assumption is not true anymore because of the attachment of chromophores into the dendrimer backbone. The real values of k2 are described by Eq. (7) k ¼ sinðdD Þ sinðdA Þ cosðjDA Þ À 2 cosðdD Þ cosðdA Þ ð7Þ where jDA is the azimuthal angle between the involved transition dipole moment directions of the energy donor D and acceptor A, and dD and dA are the angles between the corresponding dipole directions of D and A with the internuclear D–A axis, respectively.
In view of the typical power dependence, the 40 ps component of p-C2P4 can also be attributed to an annihilation process. Because of the dependence of a2 and a3 on the excitation energy in p-C2P4, both the 5 and 40 ps components can be attributed to singlet–singlet annihilation processes. Since this is a Fo¨ rster allowed excitation energy transfer process, it has to be distance dependent. The appearance of two annihilation processes in p-C2P4 probably relates to the presence of constitutional isomers, which gives a broader distribution of distances between neighboring chromophores compared to that of p-C1P4.
Schweitzer, J. Hofkens, T. Gensch, M. Maus, F. C. De Schryver, A. Herrmann, and K. Mu¨ llen, Chem. Phys. Lett. 1999, 310, 73. 27. (a) D. L. Andrews and A. D. , Resonance Energy Transfer, John Wiley & Sons, Hoboken, NJ, 1999. (b) H. C. Cheung, In: Topics in Fluorescence Spectroscopy, Vol. 2, J. R. , Plenum Press, New York, 1991, p. 127. 28. M. Maus, R. De, M. Lor, T. Weil, S. Mitra. -M. Wiesler, A. Herrmann, J. Hofkens, T. Vosch, K. Mu¨ llen, and F. C. De Schryver, J. Am. Chem. Soc. 2001, 123, 7668.
Advances in Photochemistry by Douglas C. Neckers, William S. Jenks, Thomas Wolff