The energy to hydrolyze water comes from a oxidized chlororphyll. Explain
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Answer:
Structure and Reactions of Chlorophyll
James Steer
Introduction
Chlorophyll is a green compound found in leaves and green stems of plants. Initially, it was assumed that chlorophyll was a single compound but in 1864 Stokes showed by spectroscopy that chlorophyll was a mixture. If dried leaves are powdered and digested with ethanol, after concentration of the solvent, 'crystalline' chlorophyll is obtained, but if ether or aqueous acetone is used instead of ethanol, the product is 'amorphous' chlorophyll.
In 1912, Willstatter et al. (1) showed that chlorophyll was a mixture of two compounds, chlorophyll-a and chlorophyll-b:
Chlorophyll-a (C55H72MgN4O5, mol. wt.: 893.49). The methyl group marked with an asterisk is replaced by an aldehyde in chlorophyll-b (C55H70MgN4O6, mol. wt.: 906.51).
The structure of chlorophyll-a
The two components were separated by shaking a light petroleum solution of chlorophyll with aqueous methanol: chlorophyll-a remains in the light petroleum but chlorophyll-b is transferred into the aqueous methanol. Cholorophyll-a is a bluish-black solid and cholorophyll-b is a dark green solid, both giving a green solution in organic solutions. In natural chlorophyll there is a ratio of 3 to 1 (of a to b) of the two components.
The intense green colour of chlorophyll is due to its strong absorbencies in the red and blue regions of the spectrum, shown in fig. 1. (2) Because of these absorbencies the light it reflects and transmits appears green.
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