Discussion
What is the effect of a paramagnetic impurity such as dissolved oxygen on a spectrum?
Answer: D
Unpaired electrons relax nuclei very efficiently, so both T1 and T2 fall and lines broaden, an effect large enough that degassing is worthwhile for high resolution work and essential for measuring nuclear Overhauser effects. The same mechanism is turned to advantage when a chromium relaxation agent is added deliberately to shorten long carbon T1 values in quantitative work. Paramagnetic shift reagents do move peaks, but that is a different and much larger contact and pseudocontact effect, and no impurity splits a peak.
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