Synthesis and properties of metal phthalocyanines based on disulfophthalic acid

Octasulfo-substituted cobalt phthalocyaninate was synthesized from 3,5-disulfophthalic acid, and its ammonium salt was converted into the corresponding sulfonyl chloride by the action of chlorosulfonic acid. Treatment of the chlorosulfonyl-substituted phthalocyanine complex with aliphatic amines gave octaalkyl-sulfamoyl derivatives. The products were characterized by IR and electronic absorption spectra.