Advanced Organic Chemistry: Mass spectrum of butane CH3CH2CH2CH3 SITEMAP * HOME PAGE * SEARCH * GCSE Level Chemistry age ~14-16 * Advanced Level Chemistry age ~16-19
Interpreting the mass spectrum of butane CH3CH2CH2CH3
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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 butane
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mobile phone in 'landscape' mode? See also comparing the IR, mass, 1H NMR and 13C NMR spectra of 2-methylpropane and butane
Butane C4H10
For more see The molecular structure, classification and naming of alkanes Interpreting the fragmentation pattern of the mass spectrum of butane [M]+ is the molecular ion peak (M) with an m/z of 58 corresponding to [C4H10]+, the original butane molecule minus an electron, [CH3CH2CH2CH3]+. You might see a tiny M+1 peak at m/z 59, corresponds to an ionised butane molecule with one 13C atom in it i.e. an ionised butane molecule of formula [13C12C3H10]+
The most abundant ion of the molecule under mass spectrometry investigation (butane) 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 butane. Unless otherwise indicated, assume the carbon atoms in butane are the 12C isotope. Some of the possible positive ions, [molecular fragment]+, formed in the mass spectrometry of butane.
See also comparing the IR, mass, 1H NMR and 13C NMR spectra of 2-methylpropane and butane
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