Abstract
The visible absorption
spectra of two reactive dyes based on the copper
phthalocyanine chromophore have been investigated as a function of
concentration, temperature, pH, ionic strength, and solvent. The persistence of
isosbestic points indicates that an equilibrium
exists, over the concentration range investigated, between two forms of the dye
only, namely dimer and monomer. The addition of urea exerts a relatively small
disaggregating influence on this equilibrium. On the other hand decrease in
dielectric constant substantially changes the equilibrium in favour of the
monomeric species.
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