Concentration dependence of aggregates of copper chlorophyllin (Cu-chin) molecules in ethanolwater mixed solvents has been investigated by ESR and vaper pressure measurements. Cu-chin exists as oligomeric species in low ethanol concentration (5%) while it forms monomeric one in high ethanol concentration (75%). The vaper pressure measurement showed that the aggregate exists in dimeric form in dilute aqueous solution ( < 1 mmol dm^-3), and in polymeric form (degree of polymerization = 7)in higher concentration.

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