a) The above structure is incomplete. Add electron pairs, non-zero formal charges, and/or additional bonds where needed to fulfill the octet rule to complete the structure. b) When Fe²+ is added to the structure in part a), the H atoms connected to the N are removed, see figure on the right. If you think of the heme ring as 4 N atoms, determine the molecular geometry of the new structure (you can draw it like [FeN4]2+). Imagine each N connects to Fe with a single bond. N N Fe²+-N N

Chemistry: An Atoms First Approach
2nd Edition
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Author:Steven S. Zumdahl, Susan A. Zumdahl
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Chapter21: Organic And Biological Molecules
Section: Chapter Questions
Problem 145CP
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2. Hemoglobin is a protein in red blood cells that contains iron and facilitates the
transport of oxygen. The iron sits in the center of a heme ring in the form of Fe²+.
The structure of a heme ring is here.
H-C
H-C
H
I
H-C
H H
I
C-N H-N-C
C
I
C
H
C-N-H N-C
C-H
1
C-H
C-H
H H
a) The above structure is incomplete. Add electron pairs, non-zero formal charges,
and/or additional bonds where needed to fulfill the octet rule to complete the
structure.
b) When Fe²+ is added to the structure in part a), the H atoms connected to the N
are removed, see figure on the right. If you think of the heme ring as 4 N atoms,
determine the molecular geometry of the new structure (you can draw it
like [FeN4]2+). Imagine each N connects to Fe with a single bond.
N-
N
Fe²+-N
N
Transcribed Image Text:2. Hemoglobin is a protein in red blood cells that contains iron and facilitates the transport of oxygen. The iron sits in the center of a heme ring in the form of Fe²+. The structure of a heme ring is here. H-C H-C H I H-C H H I C-N H-N-C C I C H C-N-H N-C C-H 1 C-H C-H H H a) The above structure is incomplete. Add electron pairs, non-zero formal charges, and/or additional bonds where needed to fulfill the octet rule to complete the structure. b) When Fe²+ is added to the structure in part a), the H atoms connected to the N are removed, see figure on the right. If you think of the heme ring as 4 N atoms, determine the molecular geometry of the new structure (you can draw it like [FeN4]2+). Imagine each N connects to Fe with a single bond. N- N Fe²+-N N
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