Resonance Raman excitation profile of cobalt phthalocyanine at room temperature and 10 K

Abstract Resonance excitation profiles have been obtained for cobalt phthalecyanine at both room temperature and 10 K using a compressed disc of silver and the phthalocyanine. Low‐frequency vibrations are shown to be influenced mainly by displacements on the bonding nitrogen, but high‐frequency vibrations show a more complex pattern with some evidence that the vibrations v 3 and v 28 depend on C α displacements. By comparison with copper, there appears to be a greater degree of scattering from 0–0 and 0–1 transitions and there is a shift towards increase 0–0 scattering in the sharper low‐temperature profiles. It is concluded that a distortion, dynamic at room temperature and static at low temperature, plays a key role in determining the relative scattering and this distortion is larger for copper phthalocyanine than for cobalt phthalocyanine.