Surface-Enhanced Raman Spectroscopy of Electroactive Films of C60 and an Ir-C60 Complex on Gold: Symmetry Lowering, Electron Localization, and Counteraction Effects
PURDUE UNIV LAFAYETTE IN DEPT OF CHEMISTRY
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Surface-enhanced Raman SER spectra are reported for thin films of C60 and eta 5-C9H7IrCOeta2-C60 on gold electrodes in acetonitrile. The latter spectra display the hallmarks of vibrational symmetry lowering for C60 arising from metal coordination, involving splitting of the normally degenerate H sub g modes and the appearance of vibrationally forbidden bands. Only a milder selection rule relaxation is observed for SERS of uncoordinated C60. Electroreduction of both C60 and the Ir-C60 complex yielded similar frequency downshifts in the Ag pentagonal pinch mode, indicating that electron addition to the latter is fullerene localized. These spectral shifts are sensitive to the nature of the countercation.
- Organic Chemistry
- Physical Chemistry
- Electrical and Electronic Equipment
- Atomic and Molecular Physics and Spectroscopy