Berlin 2005 – wissenschaftliches Programm
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CPP: Chemische Physik und Polymerphysik
CPP 30: POSTER: Chemical physics
CPP 30.23: Poster
Dienstag, 8. März 2005, 16:30–18:30, Poster TU D
Effect of the substitution in azulene derivatives investigated by means of fs transient grating and transient absorption spectroscopy. — •Raman Maksimenka1, Benjamin Dietzek1, Torsten Siebert1, Adriana Szeghalmi1, Dirk Rausch2, Christoph Lambert2, Wolfgang Kiefer1, and Michael Schmitt3 — 1Institut für Physikalische Chemie, Universität Würzburg — 2Institut für Organische Chemie, Universität Würzburg — 3Institut für Physikalische Chemie, Universität Jena
Azulene and its derivatives have been thoroughly investigated, due to their unusual photophysical behaviour, such as dipolar character, long wavelength absorption and the violation of Kasha’s rule. Owing to these features, azulene has been incorporated into a number of organic materials, e.g. molecular switches and chromophores with nonlinear optical properties. Here we demonstrate the effect of chemical substitution on the excited state dynamics of three azulene derivatives, in which azulene acts as a π-bridge substituted by an acceptor and a donor. In comparison with the weak azulene absorption band, each of these azulene derivatives shows an unusually intense CT band at around 400-500 nm. Decay channels of the electronic states of these azulene derivatives are explored by means of fs transient grating and transient absorption spectroscopy. In all experiments non-monoexponential decays indicate a complex structure of the excited states. In conclusion, fs transient grating and transient absorption spectroscopy were applied to the investigation of the effect of substitution in azulene derivatives on the structure and the dynamics of the excited states.