Berlin 2024 – scientific programme

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DS: Fachverband Dünne Schichten

DS 10: Thin Film Application

DS 10.8: Talk

Wednesday, March 20, 2024, 17:00–17:15, A 060

Photoresponsive Nanoporous Metal Organic Framework Films with Switchable Unpaired Electron — •Yidong Liu and Lars Heinke — Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany

Photoresponsive materials enable the dynamic remote control of their inherent properties. The integration of photochromic molecules within nanoporous metal organic frameworks (MOFs) offers a distinctive avenue for tailoring material attributes, including the interplay between the MOF host and guest molecules within the pores. In our study, a MOF film of HKUST-1 type with embedded hexaarylbiimidazole (HABI) photoswitches show reversible light-induced reactions between a stable HABI dimer state and a meta-stable radical state. The transitions between the dimeric and radical forms are characterized through infrared, UV-vis and electron paramagnetic resonance (EPR) spectroscopy. Through transient uptake experiments utilizing ethanol and methanol as probe molecules, we demonstrate that the dimer-radical switching profoundly influences the host-guest interaction, particularly altering the uptake amount and the diffusion rate of the guest molecules.

Keywords: Metal-Organic Frameworks; Photoswitch; Hexaarylbiimidazole; Quartz Crystal Microbalance