Copper chlorophyll, reaction with

COPPER (In Biological Systems), The activity of copper in plant metabolism manifests itself in two forms 11) synthesis of chlorophyll, and 12) activity of enzymes. In leaves, most of the copper occurs in close association with chlorophyll, but little is known of ns rale in chlorophyll synthesis, other than the presence of cupper is required. Copper is a definite constituent of several enzymes catalyzing oxidation-reduction reactions (oxidases), in which the activity is believed to be due to the shuttling of copper between the +1 and +2 oxidalicm states,... 

Solvent structural factors seem to have little effect on activation parameters for aquation of [Co(DMSO)(NH3)5] + in ethanol-water mixtures, but are significant in polyphosphate hydrolysis (which is probably 5 n2) in dioxan-water and formic acid-water media. - Solvent structure is important in determining kinetic parameters for reaction of copper(n) with chlorophyllic acid in mixed non-aqueous media (see below). 

Non-aqueous Solvent Mixtures.— The kinetic pattern for reaction between nickel(ii) and murexide in mixtures consisting of the co-ordinating solvent DMSO and the non-co-ordinating solvent nitromethane fit an la but not a D mechanism. Rate-limiting ring closure is not expected in this system, but may be a complicating factor in the reactions of nickel(n) with 4-(2-pyridylazo)resorcinol and with 2,2 -nitrilodi-indane-l,3-dione in pyridine-nitromethane mixtures. Trends and extrema in the kinetic parameters for reaction of copper(ii) with chlorophyllic acid in pentanol-acetic acid and in methanol-acetic acid mixtures are explained in terms of solvent structural properties. ... 

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