Rostock 2019 – scientific programme

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MO: Fachverband Molekülphysik

MO 18: Posters 2: Time Resolved Spectroscopy

MO 18.11: Poster

Wednesday, March 13, 2019, 16:15–18:15, S Foyer LLM

Transient Absorption Spectroscopy of Photo-induced Guest Uptake and Release by a Photochromic Coordination Cage — •Kevin Artmann¹, Rujin Li², Dominik Welzel¹, Guido H. Clever², and Patrick Nuernberger¹ — ¹Physikalische Chemie II, Ruhr-Universität Bochum, 44780 Bochum — ²Anorganische Chemie, Technische Universität Dortmund, 44227 Dortmund

Encapsulation of guest compounds by molecular cages are a promising tool in a variety of applications. It can be used to protect, to transport, or to influence the reactivity of guest molecules, but also vice versa the guest may modify the properties of the host. Recently, Han et al. demonstrated that it is possible to trigger the reversible guest encapsulation with light by using cage systems composed of photo-switchable dithienylethene ligands [1].
In this study we investigate the influence of a guest compound on the ultrafast photodynamics of these cages. We demonstrate that the dynamics of the single ligand and of the cage in solution are similar to those of a closely related derivative examined by Ern et al. [2]. Furthermore, we show that the photodynamics of the cage with ring-closed ligands do not change after addition of the guest. In contrast, encapsulation of the guest in cages with ring-open ligands reduces the efficiency of the ring-closing reaction and gives rise to the population of another intermediate state.
Han et al., Angew. Chem. Int. Ed. 52, 1319-1323 (2013).
Ern et al., J. Phys. Chem. A 105, 1741-1749 (2001).