Pentagons and Heptagons in the First Water Layer on Pt(111)

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Abstract
Scanning tunneling topography of long-unexplained ``37'' and ``39'' periodic wetting arrangements of water molecules on Pt(111) reveals triangular depressions embedded in a hexagonal H2O-molecule lattice. Remarkably, the hexagons are rotated 30\ifmmode^\circ\else\textdegree\fi{} relative to the ``classic bilayer'' model of water-metal adsorption. With support from density functional theory energetics and image simulation, we assign the depressions to clusters of flat-lying water molecules. 5- and 7-member rings of H2O molecules separate these clusters from surrounding ``H-down'' molecules.

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