128B%20protonNMRspectra

128B%20protonNMRspectra - It is customary to measure the...

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1 It is customary to measure the resonance frequency (signal) of individual nuclei relative to the resonance frequency (signal) of a reference compound --- tetramethylsilane (TMS) Tetramethylsilane (TMS) CH 3 Si CH 3 CH 3 H 3 C Chemical shift ( Chemical shift ( δ ): the shift in ppm of an NMR signal from the signal of TMS δ = Shift in frequency from TMS (Hz) Frequency of spectrometer (Hz) 1 H-NMR spectrum of methyl acetate
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2 Signal splitting: splitting of an NMR signal into a set of peaks by the influence of neighboring nonequivalent hydrogens… the chemical shift of Ha is influenced by whether the spin of Hb is aligned with or against the applied field. (n + 1) rule: the 1H-NMR signal of a hydrogen or set of equivalent hydro- gens is split into (n + 1) peaks by a nonequivalent set of n equivalent neighboring hydrogens.
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This note was uploaded on 06/22/2010 for the course CHEM 34216 taught by Professor Currie during the Spring '10 term at Concord.

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128B%20protonNMRspectra - It is customary to measure the...

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