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The Rate of Reactions of Isomeric C2H5O+ and C3H7O+ Ions with Polyethylene Glycols and Polyethylene Glycols Ethers with Fourier Transformation/Ion Cyclotron Resonance Mass Spectrometry (FT/ICRMS)

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Author Affiliations

  • 1School of Basic Sciences, Chemistry Unit, Babcock University, Ilishan, Remo, Ogun State, NIGERIA
  • 2Department of Chemistry and Biochemistry, University of Delaware Newark DE, 19716, USA
  • 3Department of Chemistry, Niger-Delta University, Bayelsa State, NIGERIA

Res.J.chem.sci., Volume 3, Issue (5), Pages 83-88, May,18 (2013)

Abstract

Sample ion/sample molecule reactions occur with polar compounds under chemical ionization conditions and have been used to determine thermochemical parameters that include rate of reactions. In this paper, the bimolecular rates of reaction of the isomeric C2H5O + and C3H7O ions at m/z 45 and m/z 59 with PEG’s and PEGDMES were studied using the FT/ICR mass spectrometer. The bimolecular rate constants of the reactions of the isomeric C2H5O + ions with PEG oligomers were measured and were found to increase with increasing molecular weight or polarizability of the PEG oligomers. The rate constants for reactions of C2H5O from PEG and ethylene oxide were very similar for all the PEG oligomers and were relatively close to the calculated ADO values. The rate constants for reaction of C2H5O ions from dimethyl ether with ethylene glycol and diethylene glycol were significantly lower than the rate constants from the reaction with the other isomers. Similarly, the bimolecular rate constants of the reaction of the C3H7O + ions were measured and found to increase with increasing molecular weight of the PEGDME oligomers. The experimental rate constants are greater than their Langevin values.

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