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Chapter 5

14N Solid-state NMR

Nitrogen is commonly found in organic, inorganic and biological solids, yet is extremely challenging to study by solid-state NMR. This chapter presents an overview of modern methods for observing the almost-100% naturally abundant 14N isotope, a spin-1 nucleus typically subject to a large quadrupolar interaction. Either the fundamental (Δm=1) or overtone (Δm=2) 14N transitions can be observed, and these two options require very distinct experimental approaches. The former transitions are usually broadened over several MHz and require frequency-swept pulses and piecewise acquisition, while the latter transition gives far narrower linewidths and higher spectral resolution, but exhibits some unusual spin physics, particularly under magic-angle spinning. The possibility of sensitivity enhancement by polarisation transfer, or by the indirect detection of 14N signals using more amenable nuclei, is also discussed.

Print publication date: 09 Apr 2018
Copyright year: 2018
Print ISBN: 978-1-78262-854-5
PDF eISBN: 978-1-78801-046-7
ePub eISBN: 978-1-78801-419-9
Citation:
From the book series:
New Developments in NMR