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Spectral characterization of 15N spin labels

✍ Scribed by Alec Keith; David Horvat; Wallace Snipes

Publisher
Elsevier Science
Year
1974
Tongue
English
Weight
545 KB
Volume
13
Category
Article
ISSN
0009-3084

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✦ Synopsis

Nitrocide spin labels containing 1 s N have hyperfine lines at magnetic field positions different from those for 14N spin labels. This allows the use of an 14N and an l s N spin label for specific experiments where two events can be monitored at the same time. Before this technique can be used to full advantage, the spectral characteristics of 15 N spin labels under various conditions must be known. This report describes, in a comparative way, the effects of restricted rotational motion and nitroxide-nitroxide interactions on 15N.Tempon ~ and the corresponding 14N spin label. An interesting feature is that 15N extends the useful range of motion of spin labels to 14, slower tumbling rates than those conveniently handled with N. A general description of line shape changes due to spin label concentration effects is made without resorting to formalism.

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