Regensburg 2022 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

CPP: Fachverband Chemische Physik und Polymerphysik

CPP 41: Crystallization, Nucleation and Self-Assembly

CPP 41.2: Vortrag

Donnerstag, 8. September 2022, 15:30–15:45, H39

Determination of Morphologically Tailored Chirality in Supramolecular Nanostructures by X-ray Scattering — •Asena Cerhan Haink¹, Felix Wenzel², Klaus Kreger², Hans-Werner Schmidt², Richard Hildner³, and Eva M. Herzig¹ — ¹Dynamik und Strukturbildung-Herzig Group, Universität Bayreuth,Universitätsstr.30, 95447 Bayreuth,Germany — ²Makromolekulare Chemie I,Universität Bayreuth, Universitätsstr.30, 95447 Bayreuth,Germany — ³Zernike Institute for Advanced Materials, University of Groningen, Nijenborgh 4, 9747 AG Groningen, Netherlands

Designed supramolecular nanostructures allow control over their optical and electronic properties which make them promising candidates for light-harvesting applications. Recently, we presented long-range (μm) transport of excitation energy in supramolecular nanofibres based on a carbonyl-bridged triarylamine (CBT). Here, we study supramolecular CBT building blocks with chiral side groups, which result in a distinct circular dichroism (CD) signal from self-assembled nanofibres. For bundles of supramolecular nanofibres, we observe an inversion in the CD signal as a function of temperature. To understand the origin of this effect, we performed morphological characterisation using temperature-dependent Wide Angle X-ray Scattering on the CBT-based bundles. We demonstrate systematic temperature-dependent variations in the π-π stacking and the column-column distances, which indicates that the CBT-based bundles have thermoelastic behaviour and change chirality at the critical temperature.