Advanced Organic Chemistry: Mass spectrum of butan-2-ol
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Interpreting the mass spectrum of butan-2-ol CH3CH(OH)CH2CH3 (2-butanol, sec-butyl alcohol) 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 butan-2-ol Use your mobile phone in 'landscape' mode? Mass spectroscopy - spectra index
Butan-2-ol C4H10O
Interpreting the fragmentation pattern of the mass spectrum of butan-2-ol [M]+ is the molecular ion peak (M) with an m/z of 74 corresponding to [C4H10O]+, the original butan-2-ol molecule minus an electron, [CH3CH(OH)CH2CH3]+.
You might see an even smaller M+1 peak at m/z 75, corresponding to an ionised butan-2-ol molecule with one 13C atom in it i.e. an ionised butan-2-ol molecule of formula [13C12C3H10O]+
The most abundant ion of the molecule under mass spectrometry investigation (butan-2-ol) 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 butan-2-ol. Unless otherwise indicated, assume the carbon atoms in butan-2-ol are the 12C isotope. Some of the possible positive ions, [molecular fragment]+, formed in the mass spectrometry of butan-2-ol.
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