In diamonds unpaired electrons associated with nitrogen impurities can be used to enhance the 13C NMR signal via the solid-state effect. 13C spectra of three natural and two synthetic diamonds are shown that were obrained in this manner in lo-30 min.
โฆ LIBER โฆ
Experimental setup for enhanced 13C NMR spectroscopy in solids using dynamic nuclear polarization
โ Scribed by R.A Wind; F.E Anthonio; M.J Duijvestijn; J Smidt; J Trommel; G.M.C de Vette
- Publisher
- Elsevier Science
- Year
- 1983
- Weight
- 714 KB
- Volume
- 52
- Category
- Article
- ISSN
- 0022-2364
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The cis/trans conformational equilibrium of the two Ac-Pro isomers of the beta-turn model dipeptide [13C]-Ac-L-Pro-D-Ala-NHMe, 98% 13C enriched at the acetyl carbonyl atom, was investigated by the use of variable temperature gradient enhanced 1H-nmr, two-dimensional (2D) 1H,1H nuclear Overhauser eff