Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 34: Nanostructures at Surfaces II
O 34.6: Vortrag
Dienstag, 8. März 2016, 11:45–12:00, H6
Templated bilayer self-assembly of fully conjugated π-expanded macrocyclic oligothiophenes complexed with fullerenes — •Jose D. Cojal Gonzalez1, Masahiko Iyoda2, and Jürgen P. Rabe1 — 1Department of Physics & IRIS Adlershof, Humboldt-Universität zu Berlin, Berlin — 2Department of Chemistry, Graduate School of Science and Engineering, Tokyo Metropolitan University, Hachioji, Tokyo
Fully conjugated π-expanded macrocyclic oligothiophenes have been envisaged for host-guest systems, as building blocks for supramolecular nanostructures and photovoltaic applications due to their structural, optical and electronic properties. However, control over the self-assembly of such systems still remains a challenge. Here, we report a self-assembled monolayer of hydrogen-bonded trimesic acid at the interface between its heptanoic acid solution and highly oriented pyrolytic graphite. This monolayer is shown to provide host-sites for the epitaxial ordering of Saturn-like complexes of fullerenes with π-expanded oligothiophene macrocycles(1) in mono- and bilayers. The bilayer and triple layer formation was confirmed by STM tomography, based on discrete bias set-point imaging of each layer. All force-field potential interaction energy calculations confirmed the stability of the multilayer architecture. Finally, Scanning Tunneling Spectroscopy (STS) of the layers allowed for determination of the rectification characteristics and the position of the combined frontier orbitals.
(1) Shimizu H, Cojal Gonzalez JD, Hasegawa M, Nishinaga T, Haque T, Takase M, Otani H, Rabe JP and Iyoda M 2015 J. Am. Chem. Soc. 137, 3877-3885