Discussion
The νO-O resonance Raman stretching frequency (in cm-1) of the O2 coordinated to iron centre in oxy-hemoglobin is nearly
Answer: A
The O-O stretching frequency is nearly 1100 cm-1.
On binding to the iron in oxy-hemoglobin, O2 takes on superoxide character (often described as Fe(III)-O2-). Adding an electron to a π* orbital lowers the O-O bond order from 2 to about 1.5, and the stretching frequency falls from 1555 cm-1 in free O2 to about 1105 cm-1, close to that of the free superoxide ion.
1550 is free dioxygen, which would mean no electron transfer at all. About 850 is typical of peroxide (bond order 1), as in oxy-hemerythrin, not hemoglobin. 1950 is far above any O-O stretch.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development