Natural Abundance 14N and 15N Solid-State NMR Studies of Organic, Biochemical, and Pharmaceutical Systems

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Veinberg, Stanislav L.
University of Windsor
Amino acids; Nitrogen-14; Pharmaceuticals; Polymorphs; Solid-state NMR; Ultra-wideline
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thesis / dissertation description
Nitrogen is an important element in all areas of chemistry, biology, and materials science. However, it is challenging to probe directly with solid-state nuclear magnetic resonance (SSNMR). The commonly studied isotope, 15N (nuclear spin, I, = ½), has a low natural abundance (0.36%); therefore, 15N NMR experiments often require isotopically enriched samples. 14N (I = 1) has a high natural abundance (99.64%) but is a quadrupolar nucleus. 14N SSNMR spectra are generally very broad due to the moderate quadrupole moment of 14N. Ultra-wideline (UW) 14N SSNMR spectra have very low signal-to-noise, which complicates their acquisition; however, they are useful probes of molecular-level structure and dynamics, and do not require isotopic enrichment for their acquisition.