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Lei S, Ver Heyen A, De Feyter S, et al. Two-dimensional oligo(phenylene-ethynylene-butadiynylene)s: all-covalent nanoscale spoked wheels. Chemistry. 2009;15(11):2518-35doi: 10.1002/chem.200801939.
Lei, S., Ver Heyen, A., De Feyter, S., Surin, M., Lazzaroni, R., Rosenfeldt, S., Ballauff, M., Lindner, P., Mössinger, D., & Höger, S. (2009). Two-dimensional oligo(phenylene-ethynylene-butadiynylene)s: all-covalent nanoscale spoked wheels. Chemistry (Weinheim an der Bergstrasse, Germany), 15(11), 2518-35. https://doi.org/10.1002/chem.200801939
Lei, Shengbin, et al. "Two-dimensional oligo(phenylene-ethynylene-butadiynylene)s: all-covalent nanoscale spoked wheels." Chemistry (Weinheim an der Bergstrasse, Germany) vol. 15,11 (2009): 2518-35. doi: https://doi.org/10.1002/chem.200801939
Lei S, Ver Heyen A, De Feyter S, Surin M, Lazzaroni R, Rosenfeldt S, Ballauff M, Lindner P, Mössinger D, Höger S. Two-dimensional oligo(phenylene-ethynylene-butadiynylene)s: all-covalent nanoscale spoked wheels. Chemistry. 2009 Mar 02;15(11):2518-35. doi: 10.1002/chem.200801939. PMID: 19191234.
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Chemistry. 2009 Mar 02;15(11):2518-35. doi: 10.1002/chem.200801939.

Two-dimensional oligo(phenylene-ethynylene-butadiynylene)s: all-covalent nanoscale spoked wheels.

Chemistry (Weinheim an der Bergstrasse, Germany)

Shengbin Lei, An Ver Heyen, Steven De Feyter, Mathieu Surin, Roberto Lazzaroni, Sabine Rosenfeldt, Matthias Ballauff, Peter Lindner, Dennis Mössinger, Sigurd Höger

Affiliations

  1. Department of Chemistry, Laboratory of Photochemistry and Spectroscopy, and Institute for Nanoscale Physics and Chemistry, Katholieke Universiteit Leuven, Celestijnenlaan 200-F, 3001 Leuven, Belgium.

PMID: 19191234 DOI: 10.1002/chem.200801939

Abstract

Round and round: Covalently bound spokes induce an efficient template-directed cyclization towards a rigid molecular wheel (see figure) and afford dramatically increased shape-persistence properties compared with non-strutted macrocycles.The synthesis and characterization of a shape-persistent two-dimensional (2D) organic compound is described in detail. In a rational modular synthesis of a dodecaacetylene precursor and its subsequent template-aided cyclization, we obtained a molecularly defined, stable, C(6)-symmetric, rigid, spoked wheel. Peripheral tert-butyl groups and alkyl chains attached to the plane of the molecule provide sufficient solubility, so that the 2D oligomer can be fully characterized by MALDI-MS, GPC, and (1)H NMR, UV/Vis absorption, and fluorescence spectroscopy. Molecular mechanics and dynamics simulations indicate that the most stable conformer of the molecule in vacuum is a shallow boat conformation with a small dihedral angle. Comparisons with the precursor as well as a ring-only structure clearly reveal the high rigidity of the title compound. Small-angle neutron scattering (SANS) experiments in [D(8)]THF and CDCl(3) affirm the rigid backbone structure in solution, that is, a radius of about 2.7 nm and a thickness of about 0.22 nm. STM investigations illustrate that the wheel molecules adsorb with their molecular plane parallel to the surface and can form hexagonal crystalline domains (unit cell parameters are a=b=6.0+/-0.2 nm and theta=60+/-2 degrees ), with the tert-butyl groups on the apexes staggered. Such staggering induces chirality in the organized domains. AFM investigations demonstrate that the wheel molecules inside overlayers organize in the same way as in the layer directly in contact with the surface. This indicates an epitaxial growth characteristic of the film.

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