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The Raman spectrum of sulphonated copper phthalocyanine on a silver electrode surface is reported for four excitation wavelengths in the Q ‐band region at voltages between +0.6 and −0.6 V (vs SCE). SERS activity is observed and the bonding and orientation of the surface species are voltage dependent and are inferred from a vibrational analysis. Maximum scattering intensity is observed at −0.2 V (vs SCE) and is attributed to molecules bonded edge‐on to the surface through SO 3 − groups.
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McConnell et al. (1989) studied this question.
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