We attempted to theoretically investigate cathodic reaction of Au thiosulfate complex at Au (111) surface. Theoretical model of the solid-liquid interface was built using density functional theory calculation and Monte-Carlo method. As a comparison, the cathodic reaction of Au cyanide complex is also analyzed. Calculated results from this model successfully reproduced behavior of the reactions of two complexes. Furthermore, detailed analyses on the results indicated that total charge, dipole moment, and end atom of coordinates play key roles to determine the reactivity of complexes.
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