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Structural Identification of C2H5O+ and C5H7O+ ions obtained from Polyethylene Glycols and Polyethylene Glycol Dialkyl Ethers and other Sources using Chemical ionization and Fourier Transformation ion Cyclotron Mass Spectrometry

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Author Affiliations

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

Res.J.chem.sci., Volume 3, Issue (6), Pages 3-9, June,18 (2013)

Abstract

Sample ion/sample molecule reactions often occur under high pressure CI and low pressure FT/ICR conditions with large sample size of polar compounds, and are useful in obtaining molecular weight information. In this paper, FT/ICR/MS was used to study ion-molecule reactions of C2H5O+ ions made from three different sources. The ions were reacted with PEG oligomers so as to differentiate among the structures of the m/z 45 ions. Time dependence studies of product ions from these reactions were also made. C2H5O+ ions produced from ethylene oxide and from PEG oligomers reacted essentially by proton transfer and gave similar spectra which are different from those of C2H5O+ ions made from dimethyl ether. The suggested structure could be any of II –IV. The reactions of the isomeric C2H5+ ions from dimethyl ether with PEG oligomers show a methyl cation transfer as a product ion, (M+13)+ ions, suggesting a CH3--O=CH2+ structure as shown in structure I. The two isomers reacted mostly by proton transfer with minor amounts of methyl cation transfer which points to structure IX. The C3H7O+ ions from the ion-molecule reaction of acetone and vinyl methyl ether react mostly by proton transfer could have the structure of X or XI.

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