| Abstract
| - A self-assembled monolayer film (SAM) of 2,3,7,8,12,13,17,18-octaethylporphinatozinc formed on a goldsurface premodified with a SAM of 4-pyridinethiol was studied by means of surface-enhanced Ramanscattering (SERS), surface-enhanced infrared absorption (SEIRA), and ultraviolet−visible (UV−vis)spectroscopies. The SERS spectrum of the porphyrin monolayer on the pyridine-modified Au surface showsbands only from the underlying pyridine group. The frequency shift and change in the relative intensityof the bands due to the pyridine group in the SERS spectra imply indirectly the binding of themetalloporphyrin to the pyridine group in the SAM. This is further supported by the SEIRA spectra ofthe porphyrin−pyridine SAM, in which vibrational bands arising from both the porphyrin moiety and thepyridyl group appear clearly. In addition, the UV−vis spectra also suggest the formation of the porphyrin−pyridine SAM and the weak porphyrin−porphyrin interactions in the SAM.
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