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Updated: Jul 10, 2026

Imine Metathesis by Silica-Supported Catalysts Using the Methodology of Surface Organometallic Chemistry
Published on: October 18, 2019
Electron and ion reactions with hexamethyldisiloxane and pentamethyldisiloxane
S Carles1, J L Le Garrec, J B A Mitchell
1Laboratoire Physique des Atomes, Lasers, Molécules et Surfaces, Equipe: Astrochimie Experimentale, UMR CNRS-Université No. 6627 Bâtiment 11 C, Campus de Beaulieu, Université de RENNES I, 35042 Rennes Cedex, France.
Abstract:
The dissociative recombination of electrons with the hexamethyldisiloxane (HMDSO) cation ((CH(3))(3)Si-O-Si(CH(3))(3))(+) and the pentamethyldisiloxane cation ((CH(3))(3)Si-O-Si(CH(2))(2))(+) as well as the ion-molecule reaction between Ar(+) and HMDSO have been studied at 300 K using a flowing afterglow Langmuir probe-mass spectrometer apparatus. The rate constants for these reactions, measured directly for the first time, are, respectively, alpha(1)=1.8 x 10(-6), alpha(2)=3.6 x 10(-6) cm(3)s, and k=2.0 x 10(-9) cm(3)s with uncertainties of +/-30%. In addition, the electronic attachment to neutral HMDSO was also studied and an upper limit value of the rate constant was determined to be beta=3.3 x 10(-11) cm(3)s.
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