Abstract
The aim of this article is the study of the fragmentation reactions of hexaethoxydisiloxane initiated by electronic impact in the ionization chamber of a double focusing mass spectrometer. The initiation center of fragmentation reactions is established by quantum calculations. The daughter ions of hexaethoxydisiloxane molecular ion are obtained by linked scan B/E. The primary fragmentation ions with the masses 341, 297, 296 and 269 were obtained experimentally by B/E linked scan by radical induced fragmentation reactions. The eliminations of neutral fragments such as hydrogen, acetaldehyde, ethylene and water from the primary ions and the obtained ions by consecutive elimination reactions were emphasized experimentally by the B/E(1-E)1/2 linked scan by charge induced reactions.
Highlights
Gas chromatography coupled with mass spectrometry (GC-MS) was used to investigate the reactions of hydrolysis, transesterification and condensation in the sol-gel process of tetraethoxysilane (TEOS) and other silicon precursor alkoxides with diferent organic radicals [1,2,3,4,5,6,7,8]
The author developed a procedure [1,14] for the mass spectra interpretation of some silicon alkoxides and their transesters and oligomers obtained by the sol-gel process
The aim of this article was the study of the fragmentation reactions of hexaethoxydisiloxane initiated by electronic impact in the ionization chamber of a double focusing mass spectrometer
Summary
Gas chromatography coupled with mass spectrometry (GC-MS) was used to investigate the reactions of hydrolysis, transesterification and condensation in the sol-gel process of tetraethoxysilane (TEOS) and other silicon precursor alkoxides with diferent organic radicals [1,2,3,4,5,6,7,8]. Mass spectra of TEOS dimers are presented in figure 2 with the molecular ions at m/e 342, 314 and. Structural formulae, structural codes and molecular weights of identified TEOS dimers are presented in table 1. The author developed a procedure [1,14] for the mass spectra interpretation of some silicon alkoxides and their transesters and oligomers obtained by the sol-gel process. This procedure was applied in previous works [14,15] and in the present work for the interpretation of mass spectrum of hexaethoxydisiloxane
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