Interpretation Of Mass Spectra
University Science Books, 22 lug 1993 - 371 pagine
Interpretation of Mass Spectra, say the authors, "aims at correlating ion dissociation mechanisms on a much broader scale, with emphasis on basic attributes such as ionization energies, proton affinities, and bond dissociation energies". They stress that the most important part of learning how to interpret unknown mass spectra is to practise doing it.
"Prof. McLafferty's text has become a classic for classroom or self study concerned with interpreting mass spectra in order to discern molecular structures or identities of compounds." International Journal of Mass Spectrometry
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The Molecular Ion
Basic Mechanisms of Ion Fragmentation
Postulation of Molecular Structures
Theory of Unimolecular Ion Decompositions
a-cleavage ABCD+ acids alcohols aliphatic alkanes alkenes alkyl group alkyl ions allylic amines base peak bond cleaved carbon atoms characteristic charge migration charge retention charge-site Chem cleavage competitive compounds contain corresponding dissociation double bond EE+ ions elemental composition elimination esters ether even-electron ion example favored Figure formation fragment ions functional groups give heteroatom hydrogen hydrogen atoms hydrogen rearrangement IE values important increase indicates initial internal energy interpretation ion decompositions ion series ion-molecule ionization energy isomerization isomers isotopic ketones largest alkyl loss low-mass m/z Int Mass Spectrometry mass spectrum mass units McLafferty metastable ion methyl molecular ion molecular weight molecule neutral odd-electron ion oxygen pathways peak at m/z phenyl possible product ion proton affinity radical ion reactions rearrangement reactions sample saturated spectra stability steric Stevenson's Rule structure substitution Table A.3 tion Turecek Unknown unpaired electron unsaturated yield