Berlin 2024 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 15: Poster I

CPP 15.23: Poster

Montag, 18. März 2024, 18:00–20:00, Poster C

Using the Light Polarization to Control the Properties of Photoresponsive Metal-Organic Frameworks — •Taher Al Najjar, Anemar Bruno Kanj, Chun Li, and Lars Heinke — Karlsruhe Institute of Technology, Karlsruhe, Germany.

Controlling the properties of materials by applying external stimuli such as light is highly desirable for many applications. One promising realization is the incorporating photochromic molecules in the crystalline, nanoporous structure of metal-organic frameworks (MOFs). MOFs are a class of crystalline nanoporous materials with several unique properties because of their tailorable ordered structures and high surface area. Azobenzene molecules, which respond to light stimulations by isomerisation between its thermodynamically stable trans state and the excited cis state, are among the most popular photochromic molecules and can be used to functionalize MOFs. Using MOFs with fluorinated azobenzene moieties have demonstrated applications such as photoswitchable adsorption, membrane separation and ionic conduction. In this poster, a photoresponsive pillared-layer MOF thin film with incorporated fluorinated azobenzene molecules is presented. In addition to the photoisomerization upon unpolarized light of different wavelengths, the effect of the light polarization is explored. It is found that the polarization can be used to selectively isomerize the functional moieties in the MOF and, thus, to modify the material properties. We show that the polarization can be another useful parameter to control the material properties.

Keywords: MOF; Ionic liquid; Light Polarization; Photochromic molecules; Photoresponsive thin films