Advanced Organic Chemistry: Mass spectrum of 2,2-dimethylbutane
The mass spectrum of 2,2-dimethylbutane
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 2,2-dimethylbutane
2,2-dimethylbutane C6H14, , ,
Interpreting the fragmentation pattern of the mass spectrum of 2,2-dimethylbutane
[M]+ is the molecular ion peak (M) with an m/z of 86 corresponding to [C6H14]+, the original 2,2-dimethylbutane molecule minus an electron, [(CH3)3CCH2CH3]+, BUT it doesn't seem to show up!
An M+1 peak at m/z 87, corresponds to an ionised 2,3-dimethylbutane molecule with one 13C atom in it i.e. an ionised 2,2-dimethylbutane molecule of formula 13C12C5H14, BUT this is even less likely to show up!
Identifying the species giving the most prominent peaks (apart from M) in the fragmentation pattern of 2,2-dimethylbutane.
The most abundant ion of the molecule under mass spectrometry investigation is usually given an arbitrary abundance value of 100, called the base ion peak, and all other abundances ('intensities') are measured against it.
Formation of m/z 57 ion:
Formation of m/z 43 ion:
Formation of m/z 29 ion:
Sequences including m/z values of 42, 41, 40, 39 or 28, 28, 27, 26, indicate successive hydrogen atom/molecule loss from the m/z 43 or 29 ions.
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Stick diagram of the relative abundance of ionised fragments in the fingerprint pattern of the mass spectrum of 2,2-dimethylbutane. Table of the m/e m/z values and formula of the ionised fragments in the mass spectrum of 2,2-dimethylbutane. The m/e m/z value of the molecular ion peak in the mass spectrum of 2,2-dimethylbutane. The m/e m/z value of the base ion peak in the mass spectrum of 2,2-dimethylbutane. Possible examples of equations showing the formation of the ionised fragments in 2,2-dimethylbutane. Revision notes on the mass spectrum of 2,2-dimethylbutane. Matching and deducing the structure of the 2,2-dimethylbutane molecule from its mass spectrum. Mass spectroscopy of aliphatic alkanes, mass spectra of 2,2-dimethylbutane, a structural isomer of molecular formula C6H14
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