Adlayer Structures of Benzene and Pyridine Molecules on Cu(100) in Solution by ECSTM

Adsorption of benzene (C 6 H 6 ) and pyridine (C 5 H 5 N) on Cu(100) has been investigated in electrolyte solution by using cyclic voltammetry and in situ scanning tunneling microscopy (STM). Both molecules adsorbed on Cu(100) surface in HClO 4 solution and formed well-defined (2 × 2) structures with a flat-lying orientation. Structural models were proposed to interpret the bonding and coordination of the two molecules with Cu(100) surface.