INFRARED, RAMAN AND PRERESONANCE RAMAN-SPECTRA OF VANADYL(IV) TETRAPHENYLPORPHYRIN

The infrared and Raman spectra of vanadyl(IV) tetraphenylporphyrin were recorded between 1600 and 200 cm-1. Assignment of most of the vibrational modes was done by comparison with other related compounds. The V-N and V = O metal-ligand vibrations could be clearly identified. Pre-resonance experiments were performed, using different radiation from an argon ion laser, in the energy range between the main electronic transitions of the complex [the Soret band and the (alpha + beta) doublet]. Analysis of the excitation profiles suggests that all the enhanced bands contribute to both the A and B terms of Albrecht's equation.