| Abstract
| - This paper reports on the interface processes of 1,10-phenanthroline (phen) at a roughened Au electrode bysurface-enhanced Raman scattering (SERS) for the first time. Both the adsorption and coordination of phenon the roughened gold electrode have been studied. In comparison to the normal Raman spectrum of phenmonohydrate, the frequency and relative intensity change significantly in the SERS spectra. As evidenced bycyclic voltammetry, the electrochemical behavior of the Au electrode is strongly modified by the adsorbedphen. It was found that a new pair of redox peaks appeared in the cyclic voltammogram only when both phenand X (X = Cl-, Br-) were present. Information on coordination bonds of Au−N and Au−X as well as onadsorbed bonds of Au−Nad and Au−Xad, was obtained by the SERS spectra. In situ SERS investigationstogether with electrochemical measurements convincingly prove the formation of surface complexes 1,10-phenAu2X6 or [1,10-phenAuX2]AuX4 during the electro-oxidation process of Au while phen and X coadsorbedon the surface.
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