Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 12: Inorganic/Organic Interfaces: Growth II
O 12.13: Vortrag
Montag, 16. März 2015, 18:00–18:15, MA 005
Impact of the bonding motif on the chirality transfer of DiOH[6]Helicene — •Thomas Nijs1, David Schweinfurth2, Aneliia Wäckerlin1, Aisha Ahsan1, Sylwia Nowakowska1, François Diederich2, Carlo Thilgen2, and Thomas A. Jung1,3 — 1University of Basel, Switzerland — 2ETH Zurich, Switzerland — 3Paul Scherrer Institute, Switzerland
Chirality plays an important role in biological processes as it generally affects molecular recognition by shape or geometry. Therefore, it needs to be crucially controlled, for example in pharmaceutical applications.
In order to address the impact of the intermolecular bonds and their strength on the chirality transfer [1], we employ an intrinsically chiral hexahelicene with two hydroxylic functional units [2]. We study the self-assembly at Ag(111) surface at sub-monolayer coverages under the regime of two different bonding motifs: H-bonding and metal-coordination. During deposition onto Ag(111) partial dehydrogenation occurs and H-bonded trimers are formed with a distinct chiral arrangement. By annealing in presence of Co adatoms added to the sample by sublimation, full dehydrogenation occurs and metal coordination bonds are established - while maintaining a trimeric motiv. Importantly however, the system emerges into a new self-assembly pattern of the opposite chirality. The morphology of the self-assembly is investigated by STM and the bonding motif is investigated by surface chemical analysis i.e. XPS.
[1] A. Shchyrba et al., JACS, 135, 15270-15273 (2013)
[2] T. Nijs et al., manuscript in preparation