Abstract
Surface-enhanced Raman (SER) spectra are reported for thin films of C 60 and (η 5-C 9H 7)Ir(CO) (η 2-C 60) on gold electrodes in acetonitrile. The latter spectra display the hallmarks of vibrational symmetry lowering for C 60 arising from metal coordination, involving splitting of the normally degenerate H g modes and the appearance of vibrationally forbidden bands. Only a milder selection rule relaxation is observed for SERS of uncoordinated C 60. Electroreduction of both C 60 and the Ir-C 60 complex yielded similar frequency downshifts in the A g pentagonal pinch mode, indicating that electron addition to the latter is fullerene localized. These spectral shifts are sensitive to the nature of the countercation.
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