A Homomolecular Porous Network at a Cu(111) Surface

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Science  18 Aug 2006:
Vol. 313, Issue 5789, pp. 961-962
DOI: 10.1126/science.1129309

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Anthraquinone molecules self-assemble on a Cu(111) surface into a large two-dimensional honeycomb network (Math)R23° with pore diameters of ≈50 Å. The spontaneous formation of a pattern containing pores roughly five times larger than the size of the constituent molecules is unprecedented. The network originates from a delicate balance between substrate-mediated repulsion and intermolecular attraction involving an unusual chemical motif: hydrogen bonding between a carbonyl oxygen and an aromatic hydrogen atom. Substrate-mediated long-range adsorbate-adsorbate repulsion has been observed on anisotropic surfaces and in the context of the absence of pattern formation. Its applicability for the design of tailored molecular films is explored here.

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