Abstract
In studying the photochemical behaviour of chlorophyll solutions we found some simple reactions of this substance which have apparently escaped attention. We observed that chlorophyll is transformed by certain oxidizing agents, e. g. ferric chloride, into a yellow product from which it can be easily regained, e. g. by the action of ferrous chloride. The equilibrium between chlorophyll, its yellow transformation product, ferric and ferrous iron is shifted by light towards the yellow form. In this paper we present the results obtained so far in the study of the
thermal
reaction. The influence of illumination was dealt with in a preliminary paper (Rabinowitch and Weiss 1936) and will be described in detail on a later occasion.
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