Water-soluble cobalt phthalocyanines containing azo chromophores

Sulfo derivatives of 4-[(Z)-(R)-diazenyl]phthalonitriles were synthesized by diazotization and azo coupling of 4-aminophthalonitrile and used as precursors for the corresponding cobalt phthalocyanines. The latter were obtained by template synthesis in boiling polychlorinated benzenes. The spectral properties of the products were studied.