Advanced Organic Chemistry: Mass spectrum of propane
Interpreting the mass spectrum of propane
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 propane
See alsocomparing the infrared, mass, 1H NMR and 13C NMR spectra of propane, cyclopropane and propene
Propane C3H8, , , ,
Interpreting the fragmentation pattern of the mass spectrum of propane
[M]+ is the molecular ion peak (M) with an m/z of 44 corresponding to [C3H8]+, the original propane molecule minus an electron, [CH3CH2CH3]+.
The small M+1 peak at m/z 45, corresponds to an ionised propane molecule with one 13C atom in it i.e. an ionised propane molecule of formula [13C12C2H8]+
The most abundant ion of the molecule under mass spectrometry investigation (propane) 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 propane.
Unless otherwise indicated, assume the carbon atoms in propane are the 12C isotope.
Some of the possible positive ions, [molecular fragment]+, formed in the mass spectrometry of propane.
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Stick diagram of the relative abundance of ionised fragments in the fingerprint pattern of the mass spectrum of propane. Table of the m/e m/z values and formula of the ionised fragments in the mass spectrum of propane. The m/e m/z value of the molecular ion peak in the mass spectrum of propane. The m/e m/z value of the base ion peak in the mass spectrum of propane. Possible examples of equations showing the formation of the ionised fragments in propane. Revision notes on the mass spectrum of propane. Matching and deducing the structure of the propane molecule from its mass spectrum.
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