Abstract
Adsorption of phenylalanine on a Cu(001) surface was studied by means ofscanning tunnelling microscopy in ultrahigh vacuum and has been found toresult in only one superstructure, i.e., c(2×4). Moreover, itinduces steps faceting to ⟨310⟩ directions and faceted steps bunchingto form { 3 1 17} facets. In view of the small size of thec(2×4) unit cell, the phenyl ring of the molecule is suggested to beorientated nearly perpendicular rather than parallel to the surface. Amodel has thus been proposed for the c(2×4) superstructure,where the π-stacking interactions between neighbouring phenyl rings,in addition to hydrogen bond formation, are expected to play animportant role in the stabilization of the superstructure.
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