Spectro-streak picosecond studies of intramolecular charge-transfer fluorescence.
A spectro-streak photometer, an instrument for simultaneously measuring fluorescence intensity, time, and wavelength,I(t, λ), with a single picosecond excitation pulse, has been constructed. Two typical and currently highly topical examples of mesurements are discussed. (1) the temporal development of the fluorescence form the intramolecular charge-transfer (ICT) state of the rigid aromatic compound 4,5-(1'-methylindolino)3,4-naphthanthracene is studied in the protic solvent hexanol. (2) Propyl chain-linked pyrene/N,N-dimethylaniline is used as the model compound to study conformational changes associated with the transition from a contact ion pair to a sandwich exciplex.
Abteilung Spektroskopie und Photochemische Kinetik, Max-Planck-Institut für biophysikalische Chemie, Am Fassberg, D-37077, Göttingen, Germany.
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Staerk
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Wiessner
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Kühnle