DPG Phi
Verhandlungen
Verhandlungen
DPG

Hannover 2020 – scientific programme

The DPG Spring Meeting in Hannover had to be cancelled! Read more ...

Parts | Days | Selection | Search | Updates | Downloads | Help

MO: Fachverband Molekülphysik

MO 16: Femtosecond Spectroscopy II

MO 16.4: Talk

Thursday, March 12, 2020, 14:45–15:00, f102

Signatures of halogen-bond interactions in time-resolved fluorescence spectroscopy — •Bastian Geissler1, Sarah Khani2, Elric Engelage3, Christof Haettig3, Stefan Huber3, and Patrick Nuernberger11Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93040 Regensburg — 2Center for Theoretical Chemistry, Ruhr-Universität Bochum, 44780 Bochum — 3Organische Chemie I, Ruhr-Universität Bochum, 44780 Bochum

The formation of non-covalent halogen bonds between a halogenated organic compound and a Lewis base in solution is an active field of research with relevance to various chemical reactions and biological processes. However, the complex spectroscopic behavior of such mixtures and the assignment of (transient) spectroscopic signatures to halogen-bond formation in solution are still rather unexplored.

In this contribution, we focus on benzoimidazolium derivatives serving as halogen bond donors and pyridine derivatives as Lewis base acceptors dissolved in acetonitrile. We identify the impact of additional counterions [OTf]- and [BArF4]- on the fluorescence properties of these donor-acceptor pairs. In addition to ultrafast transient absorption measurements, we perform time-resolved fluorescence streak imaging studies to scrutinize halogen bonding and competing complex formations. Whereas transient absorption indicates an ultrafast reversible halogen-bond cleavage upon illumination, the fluorescence studies additionally reveal new insights concerning the role of complexation with [OTf]- and [BArF4]-.

100% | Mobile Layout | Deutsche Version | Contact/Imprint/Privacy
DPG-Physik > DPG-Verhandlungen > 2020 > Hannover