Chapter 32 - Structure Determination
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what does nmr stand for
nuclear magnetic resonance
what kind of nuclei can nmr be used on
only those with odd nuclear numbers
why cant nmr be used for carbon 12
because carbon 12 has an even mass number which means that the spins of the nucleons will cancel out to give a net spin of zero which cannot be detected
what makes the chemical shift of tms suitable to be 0
tms has a large peak which is smaller than the chemical shifts of usual organic compounds
what does tms stand for
tetramethylsilane and this is a silicon atom with four methyl groups around it
what makes tms suitable for use in nmr spectroscopy
it is inert, non-toxic, and has a low boiling point so it can be easily separated
what affects the value of the chemical shift of a peak in an nmr spectrum
the environment that the atom is in, more electronegative elements will create a larger chemical shift
what does the area under a peak in a hydrogen spectrum relate to
the number of hydogen atoms in that same environment
what does peak splitting relate to on a proton nmr spectrum
the number of non equivalent hydrogens +1 on adjacent carbon atoms