Abstract
In situ scanning tunneling microscopy (STM) was employed to study adlayer structures of benzoic acid, terephthalic acid, and pyrazine at a well-defined Pt(111) electrode in an aqueous HClO4 solution. Although benzoic acid formed disordered structures on Pt(111), high-resolution STM imaging was able to distinguish between the aromatic ring and two oxygen atoms of each flat lying benzoic acid molecule. Terephthalic acid formed a highly ordered adlayer with c(2√3 × 4)rect symmetry. Two carboxylic acid functional groups at the para-position were clearly discerned. Intermolecular interactions, presumably through hydrogen bonding, played an important role in the formation of the ordered adlayer. Pyrazine molecules formed an ordered adlayer at a relatively negative potential of 0.2 V vs a reversible hydrogen electrode. It was assumed that the molecules adsorbed horizontally at 3-fold hollow sites, forming a long range ordered adlattice of (√7 x √7)R19.1°. Disordered structures were found when the electrode poten...
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