Indian Forest Service (Mains), Chemistry optional · 2024 · Paper II
Q5(h). Spin labels for macromolecules
Question
Define spin labels and give the name and structure of a commonly used label for macromolecular investigations.
Answer in brief
A spin label is a stable paramagnetic group attached to a molecule; a common family is TEMPO-derived nitroxides.
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Coversspin labelTEMPO nitroxideESR/EPR spectroscopyMTSLsite-directed spin labelling
All parts of Question 5
- 5(a) Weight-average molecular mass5 marks
- 5(b) Zero-point vibrational energy5 marks
- 5(c) Two Birch reductions5 marks
- 5(d) Geometry of a peptide bond5 marks
- 5(e) Norrish-II cleavage of a branched aldehyde5 marks
- 5(f) IR comparison of two secondary amides5 marks
- 5(g) Chlorine and bromine isotope patterns5 marks
- 5(h) Spin labels for macromolecules5 marks