Mainz 2017 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 12: Posters 2: Molecular Dynamics, Clusters, and High Resolution Spectroscopy

MO 12.10: Poster

Mittwoch, 8. März 2017, 17:00–19:00, P OG1

Photophysics of porphyrin-based surface-anchored metal-organic frameworks investigated by time-resolved optical and EPR spectroscopy — •Michael Adams¹, Rowan W. MacQueen², Michael Oldenburg¹, Jan Behrends³, Klaus Lips², Bryce S. Richards¹, and Ian A. Howard¹ — ¹Institute of Microstructure Technology, Karlsruhe Institute of Technology — ²Berlin Joint EPR Lab, Helmholtz-Zentrum Berlin für Materialien und Energie — ³Berlin Joint EPR Lab, Fachbereich Physik, Freie Universität Berlin

Surface Anchored Metal Organic Frameworks (SURMOFs) are hybrid materials comprised of crystalline networks of organic molecules linking metal centers. The organic linkers may be active chromophores, and the structural order of the molecular assembly can give rise to intriguing new effects that differ from those observed in the lone chromophores. SURMOFs whose linkers are based on porphyrin chromophores have already stimulated interest due to their exhibition of photovoltaic action, and their ability to generate and transport triplet excitonic states to enable triplet-triplet annihilation upconversion. However, many fundamental questions regarding the photophysics of this system remain. In this contribution we provide a deeper insight into the SURMOF-2 structure using palladium porphyrin linkers by combining transient absorption spectroscopy (TAS), time-dependent luminescence and transient electron paramagnetic resonance (tEPR) measurements in order to elucidate the formation and transition between triplet, triplet aggregate, and radical species following photoexcitation.