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MASS SPECTROMETRY

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Mass spectrometry (MS)

 

a technique for measuring the

molecular weight, and thereforethe formula, of a molecule.

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! di"erent #inds of commercial

mass s$ectrometersthree %asic $arts&

'.

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Mass s$ectrum ofhe(ane

m/z on the horizontal axis and relative abundance of ions on the)ertical a(is

 The tallest $ea#, assigned an intensit* of'!!+, is called thebase peak, and the peak that corresponds to theunfragmented ion is called the  parent peak, or the molecular

ion (M).

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•  The mass s$ectrum of the $roduct

formed in the addition of a halogen to %ut--ene showed a $ea# atm/z 31. !hat halogen "as used#

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• O(idation of %utan-'-ol to gi)e%utanal gi)es a %*-$roduct whosemass s$ectrum shows $ea#s at m/z$$ and m/z %&. !hat do 'ou think

the im$urit* might %e

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• The male sex hormone testosteronecontains only C, H, and O and has a massof 288.208 am!, as determined "y hi#h$resol!tion mass spectrometry. %hat is theli&ely molec!lar form!la of testosterone

•  'ropose str!ct!res for compo!nds that

t the folloin# mass$spectral data*• /a0 A h*drocar%on with M '1

• /%0 A h*drocar%on with M 23

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