Advanced Organic Chemistry: Mass spectrum of butanoic acid
Interpreting the mass spectrum of butanoic acid (butyric acid)
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 butanoic acid
Butanoic acid (butyric acid) a carboxylic acid
Interpreting the fragmentation pattern of the mass spectrum of butanoic acid
[M]+ is the molecular ion peak (M) with an m/z of 88 corresponding to [C4H8O2]+, the original butanoic acid molecule minus an electron, [CH3CH2CH2COOH]+.
You might see a tiny M+1 peak at m/z 89, corresponds to an ionised butanoic acid molecule with one 13C atom in it i.e. an ionised butanoic acid molecule of formula [13C12C3H8O2]+
The most abundant ion of the molecule under mass spectrometry investigation (butanoic acid) 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 butanoic acid.
Unless otherwise indicated, assume the carbon atoms in butanoic acid are the 12C isotope.
Some of the possible positive ions, [molecular fragment]+, formed in the mass spectrometry of butanoic acid.
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