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Interpreting the mass spectrum of dimethylamine (N-methylmethanamine)
Doc Brown's Chemistry Advanced Level Pre-University Chemistry Revision Study Notes for UK IB KS5 A/AS GCE advanced A level organic chemistry students US K12 grade 11 grade 12 organic chemistry courses involving molecular spectroscopy analysing mass spectra of dimethylamine
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Dimethylamine, N-methylmethanamine, C2H7N, , ,
Interpreting the fragmentation pattern of the mass spectrum of dimethylamine
[M]+ is the molecular ion peak with an m/z of 45 corresponding to [C2H7N]+, the original dimethylamine molecule minus an electron, [CH3NHCH3]+.
The small M+1 peak at m/z 46, corresponds to an ionised dimethylamine molecule with one 13C atom in it i.e. an ionised dimethylamine molecule of formula [13C12CH7N]+
The most abundant ion of the molecule under mass spectrometry investigation (dimethylamine) is usually given an arbitrary abundance value of 100, called the base ion peak, and all other abundances ('intensities') are measured against it.
Identifying the species giving the most prominent peaks (apart from M) in the fragmentation pattern of dimethylamine.
Unless otherwise indicated, assume the carbon atoms in dimethylamine are the 12C isotope.
Some of the possible positive ions, [molecular fragment]+, formed in the mass spectrometry of dimethylamine.
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