Unstable methoxycyclosiloxanes [(CH3O)SiO]n (n = 2, 3)

Thermal generation and direct mass spectral studies

J. Tamás, A. Gömöry, I. Besenyei, V. N. Khabashesku, Z. A. Kerzina, N. D. Kagramanov, I. O. Bragilevsky

Research output: Contribution to journalArticle

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Abstract

Direct evidence for formation of unstable methoxy cyclosiloxanes [(CH3O)2SiO]2 (1) and [(CH3O)2SiO]3 (2) in the gas phase has been obtained by a mass-spectral study of the vacuum pyrolysis of 3,3-dimethoxy-6-oxa-3-silabicyclo[3.1.0]hexane (4). Intermediates 1 and 2 have been detected in the mass spectra of the pyrolysis products of 4 as the corresponding molecular ions, and identified from their exact masses and compositions. The metastable transitions recorded by B/E scan show the fragmentation trends of 1, 2 and 4 under electron impact (70 eV). The ionization energies (IE), determined for 1 (8.81 ± 0.1 eV) and 2 (8.50 ± 0.1 eV) are considerably lower than than the IE of linear methoxysubstituted silanes and alkanes.

Original languageEnglish
Pages (from-to)147-152
Number of pages6
JournalJournal of Organometallic Chemistry
Volume387
Issue number2
DOIs
Publication statusPublished - May 1 1990

Fingerprint

Silanes
Alkanes
Ionization potential
Hexanes
Vacuum
pyrolysis
Pyrolysis
Hot Temperature
Gases
Electrons
Ions
ionization
Hexane
molecular ions
silanes
Paraffins
alkanes
mass spectra
electron impact
fragmentation

ASJC Scopus subject areas

  • Biochemistry
  • Chemical Engineering (miscellaneous)
  • Inorganic Chemistry
  • Organic Chemistry
  • Physical and Theoretical Chemistry
  • Materials Science (miscellaneous)
  • Materials Chemistry

Cite this

Unstable methoxycyclosiloxanes [(CH3O)SiO]n (n = 2, 3) : Thermal generation and direct mass spectral studies. / Tamás, J.; Gömöry, A.; Besenyei, I.; Khabashesku, V. N.; Kerzina, Z. A.; Kagramanov, N. D.; Bragilevsky, I. O.

In: Journal of Organometallic Chemistry, Vol. 387, No. 2, 01.05.1990, p. 147-152.

Research output: Contribution to journalArticle

Tamás, J. ; Gömöry, A. ; Besenyei, I. ; Khabashesku, V. N. ; Kerzina, Z. A. ; Kagramanov, N. D. ; Bragilevsky, I. O. / Unstable methoxycyclosiloxanes [(CH3O)SiO]n (n = 2, 3) : Thermal generation and direct mass spectral studies. In: Journal of Organometallic Chemistry. 1990 ; Vol. 387, No. 2. pp. 147-152.
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AU - Kagramanov, N. D.

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