Hannover 2020 – scientific programme
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MO: Fachverband Molekülphysik
MO 4: Electronic Spectroscopy I
MO 4.5: Talk
Monday, March 9, 2020, 15:15–15:30, f142
Dispersed fluorescence spectroscopy on Cyanoindoles — •Henrichs Christian and Schmitt Michael — Institute for Physical Chemistry I, Heinrich-Heine-University, Düsseldorf
The fluorescence of tryptophan and its derivatives is utilized for the spectroscopy of proteins. Through the introduction of substituents with different inductive (and mesomere) effects in different positions of the indole chromophore, the polarity of the environment can be affected. The energetic order of the two first electronically excited singlet states of indole, La and Lb strongly depends on this polarity. Different positions of the cyano group lead into different stabilization of these two states. We used laser induced fluorescence and dispersed fluorescence spectroscopy along with Franck-Condon theory in order to determine the changes of the geometry in the cyanoindoles upon electronic excitation. We perform fits of the rotational constants from high resolution laser induced spectroscopy and the Franck-Condon factors of different La/Lb -> S0 transitions of cyanoindoles.