By Robin K. Harris
Presents a unified account of NMR spectroscopy. Nuclear Magnetic Resonance Spectroscopy explains the NMR phenomenon from the perspective of a actual chemist attracted to either basic rules and chemical purposes. This rigorous yet lucid textual content is highlighted by way of various figures together with illustrative spectra. difficulties - with solutions the place applicable - also are incorporated.
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Extra resources for Nuclear Magnetic Resonance Spectroscopy: A Physiocochemical View
Sample text
AX (b) 5x (c) 6-67 4-95 is Section 4 - 1 . Its m a g n i t u d e is d e t e r m i n e d by a s p i n - s p i n coupling constant (usually simply r e f e r r e d t o as a coupling c o n s t a n t , and written Jjk for interaction b e t w e e n spins j a n d k). T h e transition energies are affected by coupling, and indeed t h e splittings in t h e spectra are equal in m a g n i t u d e t o J. C o u p l i n g involving nuclei of s p i n > ^ is relatively rarely seen, so the following discussion relates only to spin-^ nuclei.
L-21(b)). T h u s spectral interpretation is greatly simplified, though coupling information is lost. T h e complexity of the coupled spectrum is not, of course, apparent for Fig. 1-21(a) because of the high noise level. 1-19 The multiscan principle Since N M R is intrinsically an insensitive technique, it is desirable to use all possible means to improve the signal-to-noise ratio. g. increasing B0, isotopic-enrichment, and decoupling) have already been mentioned. With the ready availability of minicomputers an additional method becomes feasible, namely multiscan operation.
1-8 Electronic shielding The discussion of Sections 1-5 and 1-6 assumed that the presence of the sample does not perturb the magnetic field. However, this is not strictly true. Indeed, the nuclear Larmor precession itself produces a secondary magnetic field, but this effect is negligible compared to that produced by electrons. In fact, when a substance is placed in a magnetic field it becomes magnetized and modifies the field. The magnetization may be considered in terms of two contributions—a bulk (macroscopic) effect and a local (microscopic) effect.
