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Supramolecular Engineering of Functional Nanosystems
Wednesday 12 February 2025, 06:00pm
Prof. Frank Würthner, University of Würzburg, Germany
Webpage Link: Prof. Dr. Frank Würthner - Würthner Group: Organic Materials and Nanosystems Chemistry.
Location : LH-6, Lecture Hall Complex
Abstract:
Natural photosystems showcase the importance of supramolecular organization for advanced functional properties. Nevertheless, the development of molecular materials is still mostly initiated by purely molecular considerations whilst the influence of intermolecular couplings is only addressed at a later stage. For a period of more than twenty years our group has explored an alternative approach. Thus, we have studied the formation of molecular aggregates and the functional properties originating from the interaction of π-systems in terms of structure-function relationships. In this lecture I will showcase examples from our most recent research on perylene bisimide (PBI) dyes[1] as well as smaller and larger polycyclic aromatic (multi-)imides for which we could accomplish structurally well-characterized supramolecular aggregate structures[2] and obtain insight into their photofunctional properties. With the advancement of our knowledge, most recently also tailored supramolecular environments are utilized for the engineering of desired functional properties in molecular aggregates which includes (circularly polarized) fluorescence, phosphorescence and thermally activated delayed fluorescence.[3] Finally, a most recent example of supramolecular engineering based on a porous nanographene bilayer will be discussed.[4]
References:
[1] R. K. Dubey, F. Würthner, Nat. Chem. 2023, 15, 884: Playing Lego with perylene dyes.
[2] M. Mahl, M. A. Niyas, K. Shoyama, F. Würthner, Nat. Chem. 2022, 14, 457: Multilayer stacks of polycyclic aromatic hydrocarbons.
[3] J. Rühe, K. Vinod, H. Hoh, K. Shoyama, M. Hariharan, F. Würthner, J. Am. Chem. Soc. 2024, 146, 28222: Guest-Mediated Modulation of Photophysical Pathways in a Coronene Bisimide Cyclophane.
[4] M. A. Niyas, K. Shoyama, M. Grüne, F. Würthner, Nature 2025, 637, 854: Bilayer nanographene reveals halide permeation through a benzene hole.
Natural photosystems showcase the importance of supramolecular organization for advanced functional properties. Nevertheless, the development of molecular materials is still mostly initiated by purely molecular considerations whilst the influence of intermolecular couplings is only addressed at a later stage. For a period of more than twenty years our group has explored an alternative approach. Thus, we have studied the formation of molecular aggregates and the functional properties originating from the interaction of π-systems in terms of structure-function relationships. In this lecture I will showcase examples from our most recent research on perylene bisimide (PBI) dyes[1] as well as smaller and larger polycyclic aromatic (multi-)imides for which we could accomplish structurally well-characterized supramolecular aggregate structures[2] and obtain insight into their photofunctional properties. With the advancement of our knowledge, most recently also tailored supramolecular environments are utilized for the engineering of desired functional properties in molecular aggregates which includes (circularly polarized) fluorescence, phosphorescence and thermally activated delayed fluorescence.[3] Finally, a most recent example of supramolecular engineering based on a porous nanographene bilayer will be discussed.[4]
References:
[1] R. K. Dubey, F. Würthner, Nat. Chem. 2023, 15, 884: Playing Lego with perylene dyes.
[2] M. Mahl, M. A. Niyas, K. Shoyama, F. Würthner, Nat. Chem. 2022, 14, 457: Multilayer stacks of polycyclic aromatic hydrocarbons.
[3] J. Rühe, K. Vinod, H. Hoh, K. Shoyama, M. Hariharan, F. Würthner, J. Am. Chem. Soc. 2024, 146, 28222: Guest-Mediated Modulation of Photophysical Pathways in a Coronene Bisimide Cyclophane.
[4] M. A. Niyas, K. Shoyama, M. Grüne, F. Würthner, Nature 2025, 637, 854: Bilayer nanographene reveals halide permeation through a benzene hole.
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