Haemoglobin is a complex of $Fe\left(II\right)$ bound to porphyrin rings.
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Haemoglobin is a complex of $Fe\left(II\right)$ bound to porphyrin rings.

A porphyrin molecule can coordinate to a metal using the four nitrogen atoms as electron-pair donors and hence, is a polydentate ligand. This porphyrin ring consists of four pyrrole molecules cyclically linked together (by bridges) with the iron ion bound in the center.