a. Use Table 15.2 to predict the magnetic fields at which (a) 1H, (b) 2H, (c) 13C come into...

Question

a. Use Table 15.2 to predict the magnetic fields at which (a) ¹H, (b) ²H, (c) ¹³C come into resonance at (i) 250 MHz, (ii) 500 MHz.

b. Use Table 15.2 to predict the magnetic fields at which (a) ¹⁴N, (b) ¹⁹F, and (c) ³¹P come into resonance at (i) 300 MHz, (ii) 750 MHz.

Synoptic table 15.2* Nuclear spin properties
Nuclide	Natural abundance/%	Spin I	g-factor, gI	Magnetogyric ratio, g/(10⁷ T ⁻¹ s⁻¹)	NMR frequency at 1 T, n/MHz
¹n		½	−3.826	−18.32	29.165
¹H	99.98	½	5.586	26.75	42.577
²H	0.02	1	0.857	4.10	6.536
¹³C	1.11	½	1.405	6.73	10.705
¹⁴N	99.64	1	0.404	1.93	3.076

David · Accepted Answer

EXPLAINATION FOR GIVEN VALUES 
1. Natural abundance/% -  natural abundance of NMR active element determines 
sensitivity of instrument and sharpness of peak 
More is the abundance sharper would be the peak and lesser would b the 
amount of sample required. 
2. Spin I- nuclei with zero spin will be nmr inactive, integral or fractional spin are 
nmr active.

a. Use Table 15.2 to predict the magnetic fields at which (a) 1 H, (b) 2 H, (c) 13 C come into resonance at (i) 250 MHz, (ii) 500 MHz. b. Use Table 15.2 to predict the magnetic fields at which (a) 14...

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