Erlangen 2018 – scientific programme

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MO: Fachverband Molekülphysik

MO 13: Posters 1: Ultrafast Spectroscopy

MO 13.5: Poster

Tuesday, March 6, 2018, 16:15–18:15, Orangerie

Transient Absorption Spectroscopy of a Photochromic Coordination Cage — •Kevin Artmann¹, Rujin Li², Simon Schulke¹, Guido H. Clever², and Patrick Nuernberger¹ — ¹Physikalische Chemie II, Ruhr-Universität Bochum, 44780 Bochum — ²Anorganische Chemie, Technische Universität Dortmund, 44227 Dortmund

Coordination cages have auspicious applications due to their ability to encapsulate guest compounds selectively. Recently, Han et al. established a photochromic coordination cage for which uptake and release of the guest molecule can be triggered by light [1]. The cage is composed of two square-planar-coordinated Pd²⁺ ions and four bis-monodentate pyridyl ligands based on a dithienylethene (DTE) photoswitch. UV excitation may initiate a ring-closure of the DTE ligand and traps the guest inside the cage. In this study, we demonstrate that the ultrafast photodynamics of the single ligand in solution are similar to those of a closely related DTE derivative examined by Ern et al. [2]. However, the metal-organic coordination cage shows significant differences in its photodynamics compared to the ligand building blocks. Whereas the ground-state bleach almost completely recovers within a few ps after excitation of the closed DTE ligand, it persists for the accessible time range of several ns in the case of the closed coordination cage.
*[1] Han et al., Angew. Chem. Int. Ed. 2013, 52, 1319-1323.
*[2] Ern et al., J. Phys. Chem. A 2001, 105, 1741-1749.