| Abstract
| - Scanning tunneling microscopy (STM) has been used to study the adsorption of 1-fluoro-, 1-chloro-, and1-bromo-substituted C12 alkanes at the Si(111)-7 × 7 surface, at temperatures from 300 to 500 K. We reportself-assembly of these physisorbed adsorbates, C12H25X, to form approximately circular corrals, (C12H25X)2,with charge transfer to a corralled adatom in each case (cf. Dobrin et al. Surf. Sci.2006, 600, L43). Thecorrals comprised pairs of semicircular horizontal long-chain molecules stable to ∼100 °C. At ≥150 °C, thecorrals desorbed or reacted locally to imprint a halogen atom, X−Si, and an adjacent alkane residue, R−Si.The corral height profiles, together with the location of the imprinted X−Si resulting from thermal or electron-induced surface reaction, led to a picture of the molecular configurations in these haloalkane corrals, (C12H25X)2,X = F, Cl, Br, and the dichloro corrals, 1,12-dichlorododecane, (ClC12H24Cl)2.
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