Tiling patterns: Rubrene (C42H28) molecules self-assemble on a gold surface to create a two-dimensional tiling with a combination of slightly distorted supramolecular pentagons, hexagons, and heptagons. Both periodic and nonperiodic tessellations are observed, as well as circular singularities in extended honeycomb domains, formed by the replacement of a ring of twelve hexagons by six pentagon-heptagon pairs.
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Pivetta et al. (2007) studied this question.
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