Abstract: The electronic absorption spectra of six different alkoxy substituted phthalocyaninatozincs in different solvents have been determined. It is found that a new band (named as X bands) appeared at the longer wavelength side of the Q band in some solvents, such as toluene and CH2Cl2. The band is assigned to the protonation of phthalocyaninatozincs by trace water in the solvent, and it is further proved by the fluorescence spectra and 1H NMR. By adding pyridine to the solution this X band vanishs, and by adding water to the desiccated solvent this X band recurs.

Key words: Phthalocyaninatozincs, Electronic absorption spectra, Protonation