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Answer by ringo for Why/how is blood red? (colours of hemoglobin)
The $\ce{Fe}$-porphyrin complex is a vastly conjugated $\pi$-system, in which the oxidation state of the $\ce{Fe}$ plays a central role. The wavelength of light absorbed by hemoglobin exactly...
View ArticleWhy/how is blood red? (colours of hemoglobin)
Oxyhaemoglobin is red, deoxyhaemoglobin is bluish-purple, and carboxyhaemoglobin is a cherry red colour.Evidently in the porphyrin around the iron molecule in heme there is a conjugated $\pi$-system...
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