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Interpreting the mass spectrum of propyl methanoate
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 propyl methanoate
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Propyl methanoate (propyl formate)
Interpreting the fragmentation pattern of the mass spectrum of propyl methanoate
[M]+ is the molecular ion peak (M) with an m/z of 88 corresponding to [C4H8O2]+, the original propyl methanoate molecule minus an electron, [HCOOCH2CH2CH3]+.
Not here, but you might see an M+1 peak at m/z 89, corresponding to an ionised propyl methanoate molecule with one 13C atom in it i.e. an ionised propyl methanoate molecule of formula [13C12C3H8O2]+
The most abundant ion of the molecule under mass spectrometry investigation (propyl methanoate) 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 propyl methanoate.
Unless otherwise indicated, assume the carbon atoms in propyl methanoate are the 12C isotope.
Some of the possible positive ions, [molecular fragment]+, formed in the mass spectrometry of propyl methanoate.
Formation of m/z 42 ion:
Formation of m/z 31 ion:
Formation of m/z 29 ion:
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