Mainz 2017 – scientific programme
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MO: Fachverband Molekülphysik
MO 12: Posters 2: Molecular Dynamics, Clusters, and High Resolution Spectroscopy
MO 12.10: Poster
Wednesday, March 8, 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.