In situ electrochemical STM of charge-transfer complex on Cu(1 1 1)

Adsorption and adlayer structures of ferrite magnetic anion [Fe(C2O4)3]3−, organic π-electron donor bis(ethylenedithio) tetrathiafulvalene (bedt-ttf) and charge-transfer complex (bedt-ttf)5(H3O)Fe(C2O4)3·CH2Cl2 have been investigated by using electrochemical scanning tunneling microscopy on Cu(1 1 1) electrode surfaces in aqueous HClO4 solution. It was found that [Fe(C2O4)3]3− formed a (4×4) structure with a characteristic propeller shape for each anion and that bedt-ttf adlayer had a (4×6) symmetry. For the complex, [Fe(C2O4)3]3− and bedt-ttf co-adsorbed on Cu(1 1 1) surface and yielded a well-defined two-dimensional network, in which one [Fe(C2O4)3]3− interacted with three bedt-ttf molecules.