Resonance Raman spectra of Cu-1:3:5:7-tetramethyl porphin and Cu-1:2:3:4:5:6:7:8-octamethyl porphin

Resonance Raman spectra of Cu-1:3:5:7-tetramethyl porphin and Cu-1:2:3:4:5:6:7:8-octamethyl porphin have been obtained both in dilute CS2 solution and as solids dispersed in KBr matrices using the Ar+ and tunable Rhodamine 6G dye lasers. The solution data for Cu-octamethyl porphin show that its rigorous molecular symmetry in solution is D4h, while the spectral data for Cu-tetramethyl porphin are consistent with C4h molecular symmetry. Assignments for some of the stronger bands are discussed by comparing the spectra of these two molecules with other planar metalloporphins and porphyrins.