During a bioinorganic chemistry course, my teacher gives a lot of importance to spin states of metal ions and how they changes (or not) after the formation of a complex.

For example, when hemoglobin's Fe(II) ion couples with oxygen molecule, it's spin changes from high spin to low. My teacher says that is very important but he doesn't give a reason.

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    $\begingroup$ In short, understanding chemistry -> understand structure -> understand how it carries out its function. In this case, the structure around Fe is very important in understanding the cooperative binding of O2. $\endgroup$ – orthocresol Jul 1 '19 at 19:14

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