Advanced Organic Chemistry: Mass spectrum of 2-chloropropane
The mass spectrum of 2-chloropropane
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-chloropropane
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Interpreting the fragmentation pattern of the mass spectrum of 2-chloropropane
[M]+ are the molecular ion peaks (M) with a m/z values of 78 and 80 corresponding to [C3H7Cl]+, the original 2-chloropropane molecule minus an electron, [CH3CH35ClCH3]+ and [CH3CH37ClCH3]+.
The tiny M+1 peak at m/z 79, corresponds to an ionised 2-chloropropane molecule with one 13C atom in it i.e. an ionised 1-chloropropane molecule of formula [13C12C2H735Cl]+
The most abundant ion of the molecule under mass spectrometry investigation (2-chloropropane) 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-chloropropane.
Unless otherwise indicated, assume the carbon atoms in 2-chloropropane are the 12C isotope.
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