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Is hemoglobin a complexing agent?

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Can we say that hemoglobin is a complexing agent? Discuss this issue, giving at least three reasons to substantiate your point of view.

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By definition, a complexing agent is a substance capable of forming a complex compound with another material in solution. From this definition it is fair to say that haemoglobin is a complexing agent since it does from complexes with other compounds.

Haemoglobin is made up of an Iron centre complexed to a porphyrin ligand and a protein to from what is commonly known as the heme group.

More specifically, a heme ...

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