Abstract
The conventional NMR spectrum is called a one-dimensional spectrum because it has one frequency dimension—the chemical shift and the coupling are displayed on the same axis with intensity plotted in the second dimension. In two-dimensional NMR spectra we have two frequency dimensions, displayed on orthogonal axes, with intensity as the third dimension. They are used to establish connections, coupling or spatial, between the nuclei giving the signals displayed on one axis and the nuclei giving the signals on the other axis. If both axes have spectra derived from the same element, the spectra are said to be auto-correlated. If the spectra on the two axes are from different elements they are said to be cross-correlated.
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Reference
Matsumori N, Kaneno D, Murata M, Nakamura H, Tachibana K (1999). J Am Chem Soc 64:866–876
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Fleming, I., Williams, D. (2019). 2D-Nuclear Magnetic Resonance Spectra. In: Spectroscopic Methods in Organic Chemistry. Springer, Cham. https://doi.org/10.1007/978-3-030-18252-6_5
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DOI: https://doi.org/10.1007/978-3-030-18252-6_5
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