Chemical Ionization of Saturated Hydrocarbons Using Organometallic Ion Chemistry
H M. Byrd, Charles M. Guttman, D P. Ridge
Introduction: The potential for quick and direct measurement of chemical composition, absolute molecular mass (MM), MM distribution of linear and branched saturated polyolefins makes mass spectrometry especially attractive to the polymer industry. However, due to the lack of polar groups, unsaturation and aromaticity, mass spectral analysis of this class of polymers has been plagued by the inefficiency of conventional methods of cationization. The present study demonstrates the feasibility of the h5-cyclopentadienylcobalt ion (CpCo +) as a suitable cationization reagent for saturated hydrocarbons analysis by mass spectrometry.Methods: Ion/molecule reactions of CpCo + and selected linear alkanes (no. of C atoms 15) were examined using Fourier-transform ion cyclotron resonance mass spectrometry. Second-order rate constants and reaction efficiencies were determined for the reactions studied.Preliminary Data: Loss of two hydrogen molecules from the adduct ion was found to dominate all reactions (greater than or equal to 80 %). Furthermore, this dehydrogenation reaction efficiency increases with increasing chain length. These initial results suggest that the CpCo + ion may be a promising cationization reagents of larger saturated polyethylenes.
Proceedings of the 50th American Society for Mass Spectrometry Conference on Mass Spectrometry and Allied Topics
, Guttman, C.
and Ridge, D.
Chemical Ionization of Saturated Hydrocarbons Using Organometallic Ion Chemistry, Proceedings of the 50th American Society for Mass Spectrometry Conference on Mass Spectrometry and Allied Topics, Orlando, FL, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=852051
(Accessed May 30, 2023)