Advanced Organic Chemistry: Mass spectrum of propene ('propylene')
Interpreting the mass spectrum of propene ('propylene')
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 propene
See alsocomparing the infrared, mass, 1H NMR and 13C NMR spectra of propane, cyclopropane and propene
Propene, , , , , ,
Interpreting the fragmentation pattern of the mass spectrum of propene
[M]+ is the molecular ion peak (M) with an m/z of 42 corresponding to [C3H6]+, the original propene molecule minus an electron, [CH3CH=CH2]+.
The small M+1 peak at m/z 43, corresponds to an ionised propene molecule with one 13C atom in it i.e. an ionised propene molecule of formula [13C12C2H6]+
The most abundant ion of the molecule under mass spectrometry investigation (propene) 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 propene.
Unless otherwise indicated, assume the carbon atoms in propene are the 12C isotope.
Some of the possible positive ions, [molecular fragment]+, formed in the mass spectrometry of propene.
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Stick diagram of the relative abundance of ionised fragments in the fingerprint pattern of the mass spectrum of propene. Table of the m/e m/z values and formula of the ionised fragments in the mass spectrum of propene. The m/e m/z value of the molecular ion peak in the mass spectrum of propene. The m/e m/z value of the base ion peak in the mass spectrum of propene. Possible examples of equations showing the formation of the ionised fragments in propene. Revision notes on the mass spectrum of propene. Matching and deducing the structure of the propene molecule from its mass spectrum.
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