Physics:Receptivity (NMR)

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Short description: Scientific term

In NMR spectroscopy, receptivity refers to the relative detectability of a particular element. Some elements are easily detected, some less so. The receptivity is a function of the abundance of the element's NMR-responsive isotope and that isotope's gyromagnetic ratio (or equivalently, the nuclear magnetic moment). Some isotopes, tritium for example, have large gyromagnetic ratios but low abundance. Other isotopes, for example 103Rh, are highly abundant but have low gyromagnetic ratios. Widely used NMR spectroscopies often focus on highly receptive elements: 1H, 19F, and 31P. [1]

Receptivity of Selected Spin 1/2 Nuclei
Isotope Natural abundance (%) Magnetogyric Ratio (107 rad⋅s−1⋅T−1) Receptivity vs 13C (RC)
3H 0 28.5 -
1H 99 26.8 5700
13C 1.11 6.7 1
19F 100 25.1 4700
31P 100 10.8 377
77Se 7.58 5.10 3.0[2]
103Rh 100 -0.84 0.18

References

  1. NMR and the Periodic Table. NY: Academic Press. 1978. 
  2. Duddeck, Helmut (2004). 77Se NMR Spectroscopy and Its Applications in Chemistry. Annual Reports on NMR Spectroscopy. 52. pp. 105–166. doi:10.1016/S0066-4103(04)52003-3. ISBN 9780125054522.