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3 Basic concepts for two-dimensional NMR

3 13 Basic concepts fortwo- dimensional NMR ,QWURGXFWLRQThe Basic ideas of two- dimensional NMR will be introduced by reference tothe appearance of a COSY spectrum ; later in this lecture the productoperator formalism will be used to predict the form of the NMR spectra (one- dimensional spectra) are plots ofintensity vs. frequency; in two- dimensional spectroscopy intensity is plottedas a function of two frequencies, usually called F1 and F2. There are variousways of representing such a spectrum on paper, but the one most usuallyused is to make a contour plot in which the intensity of the peaks isrepresented by contour lines drawn at suitable intervals, in the same way as atopographical map. The position of each peak is specified by two frequencyco-ordinates corresponding to F1 and F2. Two- dimensional NMR spectraare always arranged so that the F2 co-ordinates of the peaks correspond tothose found in the normal one- dimensional spectrum , and this relation isoften emphasized by plotting the one- dimensional spectrum alongside the figure shows a schematic COSY spectrum of a hypothetical moleculecontaining just two protons, A and X, which are coupled together.

3–1 3 Basic concepts for two-dimensional NMR ,QWURGXFWLRQ The basic ideas of two-dimensional NMR will be introduced by reference to the appearance of a COSY spectrum; later in this lecture the product

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