Single site spectra of Zn porphin in triphenylene

Single site spectra of Zn porphin in triphenylene have been recorded at low temperature. There were three principal site species, each of which had slightly different fluorescence and absorption spectra. Because the spectra of each site were separately recorded, the confusion which resulted from the spectra of multiple site species in previous studies was eliminated. Vibrational assignments in the ground and excited electronic states were made, and relative intensities of the spectral lines recorded. The general pattern of intensity of the spectra was in qualitative agreement with the theory of vibronic borrowing in the cyclic polyene model.