![]() ![]() The split peaks ( multiplets) arise because the magnetic field experienced by the protons of one group is influenced by the spin arrangements of the protons in an adjacent group. This complication, which may be disturbing to a student who longs for the simple life, is in fact very useful to the organic chemist, and adds greatly to the power of NMR spectroscopy as a tool for the elucidation of chemical structures. True, we see absorptions in the regions we predicted, but these absorptions appear as a group of two peaks (a doublet) and a group of three peaks (a triplet). However, when we look at the spectrum it appears to be much more complex. ![]() \)įrom what we have learned about 1H NMR spectra so far, we might predict that the spectrum of 1,1,2-trichloroethane, CHCl 2CH 2Cl, would consist of two peaks-one, at about 2.5-4.0 δ, expected for CH 2-halogen compounds and one shifted downfield because of the presence of an additional electronegative chlorine atom on the second carbon. ![]()
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