Abstract
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.
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