Youdi Peng, Zhenjiang Niu, Wei Huang, Shu Chen, and Zelin Li*

Department of Chemistry, Hunan Normal University, Changsha 410081, China, and Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004, China

Received: December 13, 2004

In Final Form: April 4, 2005

Abstract:

This paper reports on the interface processes of 1,10-phenanthroline (phen) at a roughened Au electrode by surface-enhanced Raman scattering (SERS) for the first time. Both the adsorption and coordination of phen on the roughened gold electrode have been studied. In comparison to the normal Raman spectrum of phen monohydrate, the frequency and relative intensity change significantly in the SERS spectra. As evidenced by cyclic voltammetry, the electrochemical behavior of the Au electrode is strongly modified by the adsorbed phen. It was found that a new pair of redox peaks appeared in the cyclic voltammogram only when both phen and X (X = Cl-, Br-) were present. Information on coordination bonds of Au-N and Au-X as well as on adsorbed bonds of Au-Nad and Au-Xad, was obtained by the SERS spectra. In situ SERS investigations together 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 coadsorbed on the surface.

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