Raman spectroscopic evidence of porphyrin-phenyl resonance interactions in tetraphenylporphin, tetraphenylporphin dication, and copper(II) tetraphenylporphin

Resonance Raman spectra of tetraphenylporphin in the solid state, tetraphenylporphin dication (with trifluoroacetate as counterion) in the solid state and in chloroform solution, and copper(II) tetraphenylporphin in the solid state were compared with resonance Raman spectra of the corresponding tetra(perdeuteriophenyl)porphin derivatives. The isotopic shift of a band at ~1233 cm⁻¹ in undeuterated compounds to ~1183 cm⁻¹ in phenylperdeuterated compounds demonstrates the existence of phenylporphyrin resonance interactions in the compounds described.