During the binding of O₂ to myoglobin (consider 'heme' in xy-plane), the molecular orbital of O₂ and atomic… · ABC26IN0915
Subject: Inorganic Chemistry · Chapter: Bioinorganic Chemistry · Topic: Bioinorganic Chemistry – General · Exam: NET DEC 2019 · Marks: 2 · Difficulty: Medium
During the binding of $\mathrm{O}_{2}$ to myoglobin (consider 'heme' in xy-plane), the molecular orbital of $\mathrm{O}_{2}$ and atomic orbital of Fe involved in the formation of the $\sigma$-bond is
(a)$\pi^{*}$ and $\mathrm{d}_{\mathrm{z}}{ }^{2}$
(b)$\pi^{*}$ and $\mathrm{d}_{\mathrm{xz}}$
(c)$\pi$ and $\mathrm{d}_{\mathrm{xz}}$
(d)$\pi$ and $\mathrm{d}_{\mathrm{z}}^{2}$
Answer
Answer: A ✓ checked by 4AB · confidence high
Explanation
With the haem in the xy-plane, the σ-bond to the end-on O₂ is formed between the O₂ π* orbital and the iron d_z² orbital pointing along z.