By L. M. Jackman, S. Sternhell, D. H. R. Barton and W. Doering (Auth.)
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Extra info for Application of Nuclear Magnetic Resonance Spectroscopy in Organic Chemistry
8) the observation of ringing is a good indication of a homogeneous field. 36 An Introduction to NMR Spectroscopy The obvious way of removing the unwanted ringing from recorded signals is to use a slow sweep. There are, however, several factors which place a lower limit on permissible sweep rates. If, as is invariably the case, we ultimately wish to determine the relative separation of bands in a spectrum, it is vital that the sweep rate should not vary throughout the recording of the spectrum.
5-VALUES OF REFERENCE C O M P O U N D S Tetramethylsilane ( T . M . S . ) S o d i u m 4,4-dimethyl-4-silapentane sulphonate Acetonitrile Dioxan t-Butanol T e t r a m e t h y l a m m o n i u m chloride (000) 000 200 3-64 1-27 3-10 It should be noted that <5-values refer only to the chemical shifts of nuclei. The line positions of components of multiplets should be quoted in Hz from 2 2 95 Spin-spin tetramethylsilane, together with the spectrometer frequency. coupling constants are simply given in Hz as they are independent of field strength.
The signal-to-noise ratio will be proportional to the square root of the sweep rate. The method suffers from two disadvantages. It An Introduction to NMR Spectroscopy 42 demands higher long term stability than the CAT technique. Because slow sweep rates increase the tendency towards saturation, the DOG method must usually be operated at r. f. power levels lower than with the CAT method. A modified DOG procedure which involves only a minor modifica6 18 tion of the spectrometer has been described by Dehlsen and Robertson, and can lead to useful improvements in sensitivity as shown in Fig.