The State of Copper Chlorophyllin in Aqueous Solution

Abstract

The dependency of the difference electronic spectrum of copper chlorophyllin (Cu-chin) on concentration was observed and it was found that a part of Cu-chin in aqueous solution dimerizes above 10^-3 mol⋅dm^-3. The center-center distance in this dimer is estmated to be 10.4 A and angle formed by Cu-chin planes to be 155°. The low temperature ESR spectrum of Cu-chin indicated that Cu-chin chagnes to polymer in aqueous solution but does not in 5% ethanol solution.