Mainz 2026 – scientific programme
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MO: Fachverband Molekülphysik
MO 32: Molecular Spectroscopy III
MO 32.6: Talk
Friday, March 6, 2026, 12:30–12:45, P 204
Two-Dimensional Infrared Spectroscopy of the SURMOF Cu(Da-DBDC) — •Claudia Gräve1, Ana Claudia Fingolo2, Julian Brückel3, Luis Ignacio Domenianni1, Jörg Lindner1, Stefan Bräse3, Christof Wöll2, and Peter Vöhringer1 — 1Clausius-Institute, University of Bonn, 53115 Bonn — 2IFG, Karlsruhe Institute for Technology, 76344 Eggenstein-Leopoldshafen — 3IOC, Karlsruhe Institute for Technology, 76131 Karlsruhe
In recent years, many significant applications for metal-organic frameworks have emerged. [1] 2D-IR spectroscopy can be used to examine important processes for their catalytic application: intramolecular vibrational redistribution (IVR) and vibrational energy transfer (VET).
We investigate the COO stretching modes and the azide asymmetric stretching fundamental of the surface-mounted metal-organic framework (SURMOF) Cu(Da-DBDC). [2] For reference, we also measured its organic linker, Diazido-tolanedicarboxylic acid, in liquid THF.
In the pump-probe spectra of both samples, the diagonal excited state absorption signal of the azide fundamental blue-shifts with increasing delay because of the involvement of low-frequency modes. The kinetic traces of the linker show a fast and a slow component due to IVR and VET to the solvent, respectively. In the SURMOF, the fast component is nearly identical, while the slow one is accelerated. We attribute this to resonant excitation hopping within the solid lattice, causing canonical heating of the pump-probe focal volume.
[1] H. Furukawa et al., Science 2013, 341, 1230444. [2] J. Song et al., Angew. Chem. Int. Ed. 2023, 62, e202306155.
Keywords: 2D-IR spectroscopy; metal-organic framework