Rostock 2019 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 11: Photochemistry

MO 11.1: Hauptvortrag

Mittwoch, 13. März 2019, 10:30–11:00, S HS 001 Biologie

Properties of multiazobenzene systems - old dogs and new tricks — •Chavdar Slavov¹, Chong Yang², Luca Schweighauser³, Andreas H. Heindl³, Tim Stauch², Hermann A. Wegner³, Andreas Dreuw², and Josef Wachtveitl¹ — ¹IPTC, Goethe University, Frankfurt, Germany — ²IWR, University of Heidelberg, Heidelberg, Germany — ³IOC, Justus Liebig University, Giessen, Germany

Azobenzenes (AB) are extensively used in the development of photoswitchable nanostructures. While the photochromism of single ABs is studied in detail, the behavior of connected ABs is not well understood. We combine ultrafast spectroscopy and quantum chemical calculations to explore the properties of different multi-AB constructs [1-4]. The arrangement and the interactions of the individual photoswitch units alter the photochemistry of these systems and give rise to a variety of new molecular properties - intramolecular excitonic coupling, extended π-delocalization, molecular strain, etc. Based on our results, we conceptualize a single-molecule triple photoswitch, with selectively addressable units [4]. Such a system can be used in functional nanomaterials as a hub integrating the response to different signals. In the light of the wide spread construction and utilization of photoresponsive compounds, our studies bring new and important insights.

[1] C. Slavov, et al., PCCP, 18, 14795 (2016)

[2] C. Slavov, et al., ChemPhysChem, 18, 2137 (2017)

[3] C. Slavov, et al., JPC Lett., 9, 4776 (2018)

[4] C. Yang, et al., Chem. Sci, DOI: 10.1021/acs.jpclett.8b02159