Dresden 2020 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 98: Composites and Functional Polymer Hybrids

CPP 98.6: Vortrag

Donnerstag, 19. März 2020, 16:15–16:30, ZEU 114

Dipolar Molecular Rotors in Surface-Anchored Metal Organic Frameworks — •Xianghui Zhang1, Sebastian Hamer2, Ritesh Haldar3, Daniel Reuter4, Florian Paneff1, Dirk Volkmer4, Peter Lunkenheimer4, Ian Howard3, Rainer Herges2, and André Beyer11Physics of Supramolecular Systems and Surfaces, Bielefeld University, 33615 Bielefeld, Germany — 2Otto-Diels-Institute for Organic Chemistry, Christian-Albrechts-University of Kiel, 24098 Kiel, Germany — 3Karlsruhe Institute of Technology (KIT) Institute of Functional Interfaces (IFG) and Light Technology Institute (LTI), 76344 Karlsruhe, Germany — 4Experimental Physics V, University of Augsburg, 86135 Augsburg, Germany

Molecular rotors arranged in ordered two- and three-dimensional lattices are an emergent quantum mechanical system. We use dipolar molecular rotors as building blocks to synthesize surface-anchored metal-organic framework (MOF), which serves as a structural architecture to arrange the molecular rotors precisely in ordered arrays. The torsional barrier of single rotors was computed by ab initio DFT calculations, while dipole-dipole interactions were estimated from classical calculations. Dielectric spectroscopy was used to investigate the rotation dynamics of molecular rotors, where thermally activated reorientations of the dipolar rotors lead to an enhanced dissipation when the driving frequency is close to the natural fluctuation rate of the dipolar rotors. Both the activation energy and relaxation rates were determined experimentally and compared with theoretical calculations.

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