Advanced Organic Chemistry: Mass spectrum of 2-methylbutane
The mass spectrum of 2-methylbutane
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-methylbutane
2-methylbutane C5H12 , ,
For more see The molecular structure and naming of alkanes
Interpreting the fragmentation pattern of the mass spectrum of 2-methylbutane
[M]+ is the molecular ion peak (M) with an m/z of 72 corresponding to [C5H12]+, the original 2-methylbutane molecule minus an electron, [(CH3)2CHCH2CH3]+.
The very tiny M+1 peak at m/z 73, corresponds to an ionised 2-methylbutane molecule with one 13C atom in it i.e. an ionised 2-methylbutane molecule of formula 13C12C4H12
Identifying the species giving the most prominent peaks (apart from M) in the fragmentation pattern of 2-methylbutane.
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Stick diagram of the relative abundance of ionised fragments in the fingerprint pattern of the mass spectrum of 2-methylbutane. Table of the m/e m/z values and formula of the ionised fragments in the mass spectrum of 2-methylbutane. The m/e m/z value of the molecular ion peak in the mass spectrum of 2-methylbutane. The m/e m/z value of the base ion peak in the mass spectrum of 2-methylbutane. Possible examples of equations showing the formation of the ionised fragments in 2-methylbutane. Revision notes on the mass spectrum of 2-methylbutane. Matching and deducing the structure of the 2-methylbutane molecule from its mass spectrum. Mass spectroscopy of aliphatic alkanes, mass spectra of 2-methylbutane, an isomer of molecular formula C5H12
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