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The number of signals observed and the chemical shifts of the signals are the features of a 13C NMR spectrum are useful in determining the structure of a compound.
Carbon-13 (C13) nuclear magnetic resonance (most commonly known as carbon-13 NMR spectroscopy or 13C NMR spectroscopy) is the carbon application of nuclear magnetic resonance (NMR) spectroscopy. It is similar to proton NMR and can identify carbon atoms in organic molecules in the same way proton NMR identifies hydrogen atoms. 13C NMR is only capable of detecting 13C isotope. The major carbon isotope ¹²C is not detected. Although less sensitive than 1 H NMR spectroscopy, 13 C NMR spectroscopy is widely used to characterize organic and organometallic compounds.
Chemical Shifts
13C NMR chemical shifts follow the same principle as 1H chemical shifts, but the typical range of chemical shifts is much larger than 1H (approximately 20-fold). The chemical shift reference standard for 13C is carbon in tetramethylsilane (TMS), whose chemical shift is taken as 0.0 ppm.
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