309C: NMR Spectroscopy in Organic Chemistry
Handout 1
Return to Answers for Question Sheet 3

NMR Properties of commonly observed nuclei

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Isotope	Spin	Natural Abundance %	Magnetogyric Ratio (x107rad/T/s)	NMRa Frequency MHz 2.3488T	NMRb Frequency MHz 11.744T	Usual Reference Compound
1H	1/2	99.98	26.75	100.00	500.00	TMS
2H	1	0.015	4.11	15.35	76.75	TMS
10B	3	19.58	2.87	10.75	53.73	BF3.OEt2
11B	3/2	80.42	8.58	32.08	160.42	BF3.OEt2
13C	1/2	1.108	6.73	25.14	125.72	TMS
14N	1	99.63	1.93	7.22	36.12	NH3.NO3- or MeNO2
15N	1/2	0.37	-2.71	10.13	50.66	NH3.NO3- or MeNO2
17O	5/2	0.0037	-3.63	13.56	67.78	H2O
19F	1/2	100.0	25.17	94.08	470.39	CCl3F
23Na	3/2	100.0	7.08	26.45	132.26	1M NaCl/H2O
27Al	5/2	100.0	6.97	26.06	130.29	[Al(H2O)6]3+
29Si	1/2	4.7	-5.31	19.86	99.32	TMS
31P	1/2	100.0	10.83	40.48	202.40	H3PO4 85%
119Sn	1/2	8.58	9.97	37.27	186.36	Me4Sn
195Pt	1/2	33.8	5.75	21.50	107.49	PtCl62- or [Pt(CN)6]2-
207Pb	1/2	22.6	5.60	20.92	104.61	Me4Pb

It is common to refer to an NMR instrument by the resonance frequency of ¹H nuclei (e.g.a 200 MHz spectrometer observes ¹H at 200 MHz), but realise that the instrument could observe other NMR-active nuclei by using a different frequency.