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The aggregation and reaction with oxygen of the tetrasodium salt of cobalt phthalocyanine-4,4',4'',4'''-tetrasulphonic acid
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1973
Year
Materials ScienceInorganic ChemistryMonomer-dimer SystemEngineeringBiochemistryDimeric FormNatural SciencesSpectra-structure CorrelationOrganic ChemistryAnalytical ChemistryChemistry'-Tetrasulphonic AcidDimeric SpeciesTetrasodium SaltInorganic SynthesisPigmentInorganic Compound
The reversible addition of molecular oxygen to the tetrasodium salt of cobalt phthalocyanine-4,4?,4?,4??-tetrasulphonic acid in aqueous solution has been confirmed. Visible absorption spectra of the monomeric and dimeric species and of the oxygen adduct have been determined. A monomer-dimer system prevails at neutral pH, low ionic strength, and low dye concentrations. The oxygen adduct and the dimeric form of the dye predominate in alkaline solution.