Femtosecond fluorescence Anisotropy kinetics as a signature of ultrafast 
electronic energy transfer in bichromophoric molecules

Fidler, V.; Kapusta, P.; Nepras, M.; Schroeder, J.; Rubtsov, I. V.; Yoshihara, K.

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Femtosecond fluorescence Anisotropy kinetics as a signature of ultrafast electronic energy transfer in bichromophoric molecules

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Schroeder, J.
Department of Spectroscopy and Photochemical Kinetics, MPI for biophysical chemistry, Max Planck Society;

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Zitation

Fidler, V., Kapusta, P., Nepras, M., Schroeder, J., Rubtsov, I. V., & Yoshihara, K. (2002). Femtosecond fluorescence Anisotropy kinetics as a signature of ultrafast electronic energy transfer in bichromophoric molecules. Zeitschrift für Physikalische Chemie-International Journal of Research in Physical Chemistry & Chemical Physics, 216, 589-603.

Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0012-F4B0-B

Zusammenfassung

Ultrafast time resolved fluorescence anisotropy decay measurements were performed to gain insight into the energy gap dependence of donor-acceptor inter-chromophoric coupling within one supra-molecule. Three new compounds, each consisting of two semi-rigidly linked and strongly coupled chromophores, were designed and synthesized for this study. Their general structure is donor-spacer-acceptor, where "donor" is phenylamino, pyrenylamino, or benzanthronylamino moiety, and acceptor is aminobenzanthrone. While being similar structurally, the compounds differ significantly in the excitation energy difference of the two chromophores in a supra-molecule. Experimental data show an ultrafast initial fluorescence emission anisotropy decrease (within less then I ps) when the excited state energies of the interacting chromophores are close to each other or equal. No such fast fluorescence anisotropy dynamics is observed for a compound with a large energy gap.