Iron is attached to globin part of haemoglobin by
1) coordinate-covalent bond/coordinate bond
2) ionic bond
3) covalent bond
4) H-bond?

Question

Iron is attached to globin part of haemoglobin by 1) coordinate-covalent bond/coordinate bond 2) ionic bond 3) covalent bond 4) H-bond?

Answer

Iron or the haem part of the haemoglobin is attached to the globin part with the help of coordinate covalent bond.

Answer

L think co.ordination covalent..bcz oxidation state of iron in heamoglobin is +2..and oxygen in o2 state
....but not sure

Answer

Iron attachment to globin part of haemoglobin

Haemoglobin is a protein found in red blood cells that is responsible for transporting oxygen from the lungs to the body's tissues. It consists of four subunits, each containing a heme group. Each heme group contains an iron ion (Fe2+) that is coordinated to a porphyrin ring.

1) Coordinate-covalent bond/coordinate bond:
The attachment of iron to the globin part of haemoglobin is primarily achieved through a coordinate-covalent bond, also known as a coordinate bond. In this type of bond, the iron ion donates a pair of electrons to the porphyrin ring, forming a coordination complex. The iron ion acts as a Lewis acid, accepting a pair of electrons from the Lewis base, which is the porphyrin ring.

2) Ionic bond:
While there may be some ionic interactions between the positively charged iron ion and negatively charged amino acid residues in the globin part of haemoglobin, the main mode of iron attachment is through a coordinate bond rather than an ionic bond. Ionic bonds involve the complete transfer of electrons between atoms, whereas coordinate bonds involve the sharing of electron pairs.

3) Covalent bond:
Covalent bonds involve the sharing of electron pairs between atoms. While covalent bonds may be present within the heme group itself, the attachment of iron to the globin part of haemoglobin is primarily a coordinate bond rather than a covalent bond.

4) H-bond:
Hydrogen bonds (H-bonds) are weak electrostatic interactions between a hydrogen atom bonded to an electronegative atom and another electronegative atom. H-bonds are not involved in the attachment of iron to the globin part of haemoglobin.

In conclusion, the attachment of iron to the globin part of haemoglobin is achieved primarily through a coordinate-covalent bond, where the iron ion donates a pair of electrons to the porphyrin ring. This coordination complex allows haemoglobin to efficiently bind and release oxygen, enabling it to fulfill its crucial role in oxygen transport throughout the body.

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