SURFACE CHEMISTRY: Heat and Meet

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Science  02 Dec 2005:
Vol. 310, Issue 5753, pp. 1393c
DOI: 10.1126/science.310.5753.1393c

The formation of well-ordered supramolecular arrays on metal surfaces by large molecules is favored by high surface mobility and strong molecular interactions, requirements that work at cross purposes. Stöhr et al. show that a large perylene derivative, DPDI (4,9-diaminoperylenequinone-3,10-diimine), does not form hydrogen bonds at room temperature on an atomically flat Cu(111) surface, but does after annealing at 300°C, which causes the loss of H2 and converts some of the amino groups into hydrogen bond acceptors. Scanning tunneling microscopy (STM) revealed the formation of open honeycomb networks for surface coverages of DPDI between 0.1 and 0.7 monolayer (ML) after high-temperature annealing; above 0.7 ML, the honeycomb structure occupied too much area, and at 0.85 ML, trimers formed instead. Finally, at 1 ML, chained structures that minimize the space between molecules formed. — PDS

Angew. Chem. Int. Ed. 44, 7394 (2005).

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