Advanced Organic Chemistry: Mass spectrum of 2-bromopropane
The mass spectrum of 2-bromopropane
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-bromopropane
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2-bromopropane, C3H7Br, CH3CHBrCH3, ,
Interpreting the fragmentation pattern of the mass spectrum of 2-bromopropane
[M]+ is the molecular ion peaks (M) with an m/z of 122 and 124 corresponding to [C3H7Br]+, the original 2-bromopropane molecule minus an electron, [CH3CHBrCH3]+.
The very tiny M+1 peaks at m/z 123 and 124, corresponds to an ionised 2-bromopropane molecule with one 13C atom in it i.e. an ionised 2-bromopropane molecule of formula [13C12C2H7Br]+
The most abundant ion of the molecule under mass spectrometry investigation (2-bromopropane) is usually given an arbitrary 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-bromopropane.
Unless otherwise indicated, assume the carbon atoms in 2-bromopropane are the 12C isotope.
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