Structure Elucidation Using Gas Chromatography−Infrared Spectroscopy/Mass Spectrometry Supported by Quantum Chemical IR Spectrum Simulations

An improved strategy for compound identification incorporating gas chromatography hyphenated with Fourier transform infrared spectroscopy and mass spectroscopy (GC–FTIR/MS) is reported. (Over)­reliance on MS may lead either to ambiguous identity or to incorrect identification of a compound. However,...

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Bibliographic Details
Published in:Analytical chemistry (Washington) 2021-11, Vol.93 (46), p.15508-15516
Main Authors: Nolvachai, Yada, Salzmann, Susanne, Zavahir, J. Shezmin, Doetzer, Reinhard, Steiner, Sandra, Kulsing, Chadin, Marriott, Philip J
Format: Article
Language:English
Subjects:
Bromination
Chemistry
Chromatography
Fourier transforms
Functional groups
Gas chromatography
Industrial applications
Infrared spectroscopy
Isomers
Mass spectrometry
Mass spectroscopy
Molecular modelling
Quantum chemistry
Simulation
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Summary:An improved strategy for compound identification incorporating gas chromatography hyphenated with Fourier transform infrared spectroscopy and mass spectroscopy (GC–FTIR/MS) is reported. (Over)­reliance on MS may lead either to ambiguous identity or to incorrect identification of a compound. However, the MS result is useful to provide a cohort of possible compounds. The IR result for each tentative compound match was then simulated using molecular modeling, to provide functional group and isomer differentiation information, and then compared with the experimental FTIR result, offering identification based on both MS and IR. Several basis sets were evaluated for IR simulations; Def2-TZVPP was a suitable basis set and correlated well with experimental data. The approach was applied to industrial applications, confirming the isomers of 2,3-bis­(thiosulfanyl)-but-2-enedinitrile, bromination products of 1-bromo-2,3-dimethylbenzene, and autoxidative degradation of phenyl-di-tert-butylphosphine.
ISSN:0003-2700
1520-6882
DOI:10.1021/acs.analchem.1c03662