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MO: Fachverband Molekülphysik

MO 4: Electronic Spectroscopy

MO 4.4: Talk

Monday, March 11, 2019, 11:30–11:45, S HS 002 Biologie

Excited state dipole moment of 2-((4-methoxyphenyl)ethynyl)-3-(1-methyl-1H-indol-3-yl)quinoxaline via condensed phase thermochromic spectroscopy — •Mirko Lindic, Matthias Zajonz, Tim Oberkirch, and Michael Schmitt — Institute for Physical Chemistry I, Heinrich-Heine-University, Düsseldorf

The dipole moment of 2-((4-methoxyphenyl)ethynyl)-3-(1-methyl-1H-indol-3-yl)quinoxaline in the first excited singlet state was investigated using the method of thermochromic shifts of the fluorescence emission and absorption spectra.

Using the mentioned molecule as example some questions about the determination of excited state dipole moments in solution will be discussed: Which influence does the solvent cavity have dealing with large molecules? How is the dipole moment composed in a dye with multiple chromophores? How could quadrupole effects play a role in condensed phase measurements?

The measurements results will also be compared with values from ab initio calculations to allow a critical view on the effects of solvent molecules in spectroscopic methods.