SAMOP 2023 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 20: Poster III

MO 20.16: Poster

Donnerstag, 9. März 2023, 16:30–19:00, Empore Lichthof

Two-photon excitation spectroscopy of metal-organic frameworks — •Hongxing Hao1, Yang Cui1, Ferdinand Bergmeier2, Simon N. Deger3, Alexander Pöthig3, Eberhard Riedle2, Roland A. Fischer3, and Jürgen Hauer11Dynamical Spectroscopy, Department of Chemistry, Technical University of Munich, 85748 Garching, Germany — 2Lehrstuhl für BioMolekulare Optik, Ludwig-Maximilians-Universität München, 80538 München, Germany — 3Chair of Inorganic and Metal-Organic Chemistry, Department of Chemistry, Technical University of Munich, 85748 Garching, Germany

Metal-organic frameworks (MOFs) or coordination polymers (CPs) constitute a novel class of materials and have several interesting photophysical properties such as a high multiphoton absorption cross section. Here, we introduce a spectroscopic experiment to measure two-photon excitation spectra from the visible to the near infrared based on a non-collinear optical parametric amplifier and a phase-stable common-path birefringent interferometer via nonlinear Fourier-transform spectroscopy. We present two-photon excitation spectra in the range between 380 to 470 nm with a data acquisition time of under one minute per spectrum.

We demonstrate the feasibility of this approach by using standard dyes as test samples. After incorporating two-photon absorption active organic linker molecules in crystalline CPs or MOFs, the spectra show a shift of oscillator strength. We suggest excitonic coupling between the linkers as the mechanism behind this targeted modification of two-photon absorption property.

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