Advanced Organic Chemistry: Mass spectrum of 2-methylpropane
Interpreting the mass spectrum of 2-methylpropane (isobutane)
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-methylpropane
Interpreting the fragmentation pattern of the mass spectrum of 2-methylpropane
[M]+ is the molecular ion peak (M) with an m/z of 58 corresponding to [C4H10]+, the original 2-methylpropane molecule minus an electron, [(CH3)3CH]+.
You might see a tiny M+1 peak at m/z 59, corresponds to an ionised methylpropane 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 (2-methylpropane) 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 2-methylpropane.
Unless otherwise indicated, assume the carbon atoms in 2-methylpropane are the 12C isotope.
Some of the possible positive ions, [molecular fragment]+, formed in the mass spectrometry of 2-methylpropane.
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Stick diagram of the relative abundance of ionised fragments in the fingerprint pattern of the mass spectrum of 2-methylpropane. Table of the m/e m/z values and formula of the ionised fragments in the mass spectrum of 2-methylpropane. The m/e m/z value of the molecular ion peak in the mass spectrum of 2-methylpropane. The m/e m/z value of the base ion peak in the mass spectrum of 2-methylpropane. Possible examples of equations showing the formation of the ionised fragments in 2-methylpropane. Revision notes on the mass spectrum of 2-methylpropane. Matching and deducing the structure of the 2-methylpropane molecule from its mass spectrum. Mass spectroscopy of aliphatic alkanes, mass spectra of 2-methylpropane, a structural isomer of molecular formula C4H10
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