Advanced Organic Chemistry: Mass spectrum of 2-methylpropanoic acid
Interpreting the mass spectrum of 2-methylpropanoic acid (isobutyric 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 2-methylpropanoic acid
2-methylpropanoic acid (isobutyric acid), C4H8O2
Interpreting the fragmentation pattern of the mass spectrum of 2-methylpropanoic acid
[M]+ is the molecular ion peak (M) with an m/z of 88 corresponding to [C4H8O2]+, the original 2-methylpropanoic acid molecule minus an electron, [(CH3)2CHCOOH]+.
The tiny M+1 peak at m/z 89, corresponds to an ionised 2-methylpropanoic acid molecule with one 13C atom in it i.e. an ionised 2-methylpropanoic acid molecule of formula [13C12C3H8O2]+
The most abundant ion of the molecule under mass spectrometry investigation (2-methylpropanoic 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 2-methylpropanoic acid.
Unless otherwise indicated, assume the carbon atoms in 2-methylpropanoic acid are the 12C isotope.
Some of the possible positive ions, [molecular fragment]+, formed in the mass spectrometry of 2-methylpropanoic acid.
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