HOME PAGE * KS3 SCIENCES * GCSE BIOLOGY CHEMISTRY PHYSICS * ADVANCED LEVEL CHEMISTRY

SPECTROSCOPY INDEXES  *  All Advanced Organic Chemistry Notes  *  [SEARCH BOX]

Advanced Organic Chemistry: Mass spectrum 1,3,5-trimethylbenzene (mesitylene)

Scroll down and take time to study the content and/or follow links or [Use the website search box]

The mass spectrum of 1,3,5-trimethylbenzene (mesitylene)

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 1,3,5-trimethylbenzene (mesitylene)

email doc brown

Use your mobile phone or ipad etc. in 'landscape' mode

This is a BIG website, you need to take time to explore it

Mass spectroscopy - spectra index

C9H12 mass spectrum of 1,3,5-trimethylbenzene mesitylene fragmentation pattern of m/z m/e ions for analysis and identification of mesitylene image diagram doc brown's advanced organic chemistry revision notes 

structural formula 1,3,5-trimethylbenzene mesitylene molecular structure molecular formula C9H12 C6H3(CH3)3

Interpreting the fragmentation pattern of the mass spectrum of 1,3,5-trimethylbenzene (mesitylene, C6H3(CH3)3)

[M]+ is the molecular ion peak (M) with an m/z of 120 corresponding to [C9H12]+, the original 1,3,5-trimethylbenzene (mesitylene) molecule minus an electron, [C6H3(CH3)3)]+.

The small M+1 peak at m/z 121, corresponds to an ionised 1,3,5-trimethylbenzene (mesitylene) molecule with one 13C atom in it i.e. an ionised 1,3,5-trimethylbenzene (mesitylene) molecule of formula 13C12C8H12

Identifying the species giving the most prominent peaks (apart from M) in the fragmentation pattern of 1,3,5-trimethylbenzene (mesitylene).

m/z value of [fragment]+ 105 91 79 77 65 51 41 39
[molecular fragment]+ [C8H9]+ [C7H7]+ [C6H7]+ [C6H5]+ [C5H5]+ [C4H3]+ [C3H5]+ [C3H3]+

Analysing and explaining the principal ions in the fragmentation pattern of the mass spectrum of 1,3,5-trimethylbenzene (mesitylene)

Equations to explain the most abundant ion peaks of 1,3,5-trimethylbenzene (mesitylene)

Formation of m/z 105 ion: [C6H3(CH3)3)]+  ===>  [C8H9]+  +  CH3

The m/z 105 ion is the base peak ion, the most abundant and 'stable' ion fragment, formed by the loss of a methyl group from the parent molecular ion (120 - 15 = 105).

The formation of the m/z 77 ion: [?]+  ===>  [C6H5]+  +  ?

This is a phenyl cation and very characteristic in the mass spectrum of aromatic benzene compounds like 1,3-dimethylbenzene.


Key words & phrases: C9H12 C6H3(CH3)3 image diagram on how to interpret and explain the mass spectrum of 1,3,5-trimethylbenzene (mesitylene) m/z m/e base peaks, image and diagram of the mass spectrum of 1,3,5-trimethylbenzene (mesitylene), details of the mass spectroscopy of 1,3,5-trimethylbenzene (mesitylene),  low and high resolution mass spectrum of 1,3,5-trimethylbenzene (mesitylene), prominent m/z peaks in the mass spectrum of 1,3,5-trimethylbenzene (mesitylene), comparative mass spectra of 1,3,5-trimethylbenzene (mesitylene), the molecular ion peak in the mass spectrum of 1,3,5-trimethylbenzene (mesitylene), analysing and understanding the fragmentation pattern of the mass spectrum of 1,3,5-trimethylbenzene (mesitylene), characteristic pattern of peaks in the mass spectrum of 1,3,5-trimethylbenzene (mesitylene), relative abundance of mass ion peaks in the mass spectrum of 1,3,5-trimethylbenzene (mesitylene), revising the mass spectrum of 1,3,5-trimethylbenzene (mesitylene), revision of mass spectroscopy of 1,3,5-trimethylbenzene (mesitylene), most abundant ions in the mass spectrum of 1,3,5-trimethylbenzene (mesitylene), how to construct the mass spectrum diagram for abundance of fragmentation ions in the mass spectrum of 1,3,5-trimethylbenzene (mesitylene), how to analyse the mass spectrum of 1,3,5-trimethylbenzene (mesitylene), how to describe explain the formation of fragmented ions in the mass spectra of 1,3,5-trimethylbenzene (mesitylene) equations for explaining the formation of the positive ions in the fragmentation of the ionised molecule of 1,3,5-trimethylbenzene (mesitylene) recognising the base ion peak of 1,3,5-trimethylbenzene (mesitylene) interpreting interpretation the mass spectrum of 1,3,5-trimethylbenzene (mesitylene)


Links associated with 1,3,5-trimethylbenzene (mesitylene)

The chemistry of AROMATIC COMPOUNDS revision notes INDEX

Mass spectroscopy index

ALL SPECTROSCOPY INDEXES

All Advanced Organic Chemistry Notes

Use My Google search site box

Email doc b: chem55555@hotmail.com

 Doc Brown's Chemistry 

*

TOP OF PAGE