Coordination sphere of the hemes in oxymyoglobin and oxyhemoglobin. What is the

Question

Coordination sphere of the hemes in oxymyoglobin and oxyhemoglobin. What is the coordination number of iron in the heme unit shown here? Express your answer as an integer. What is the identity of the donor atoms? Five nitrogen atoms (four from the heme and one from the protein) and two oxygen atoms (from the O_2 molecule) coordinate iron. Four nitrogen atoms and two oxygen atom (from the O_2 molecule) coordinate iron. Six nitrogen atoms (four from the heme and two from the protein) and one oxygen atom (from the O_2 molecule) coordinate iron Six nitrogen atoms (four from the heme and two from the protein) and two oxygen atoms (from the O_2 molecule) coordinate iron. Five nitrogen atoms (four from the heme and one from the protein) and one oxygen atom (from the O_2 molecule) coordinate iron.

Explanation / Answer

Part A ) Coordination number is number of ligands around metal atom

Coordination number of Iorn is 6

Part B) The donor atoms are the one which surround metal ion

Hence Five nitrogen atoms ( four from heme and one from protein) and One oxygen atom ( from the O2 molecule) coordinate iron . ( i.e last options of givne options)

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