Mössbauer study of the donor character of oxygen in Si-O bonds

B. Csákvári, E. Csákvári, P. Gömöry, A. Vértes

Research output: Contribution to journalArticle

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Abstract

The donor strength of oxygen atoms in the Si-O-C and Si-O-Si groups has been studied by Mössbauer spectroscopy, using SnI4 as acceptor. At 80 K trimethylalkoxysilanes and the disiloxanes studied show characteristic isomer shifts on the basis of which the existence of pentacovalent SnI4·D and hexacovalent SnI4·D2 may be assumed. The changes in isomer shift due to the first and second oxygen atoms are -0.60 and -0.55 mm/sec, respectively. The coordination number is determined by the steric requirements of the donor relative to the coordination sphere of the acceptor, provided that the donor strength is sufficiently high. No donor-acceptor interactions have been observed with compounds of the-(OSiR2)-O-type. In the case of hexamethyldisiloxane, iodine is displaced from the coordination sphere. No quadrupole splitting has been observed in any of the cases studied. Thus the ratio of point charges assignable to the iodine and the donor oxygen atom is 6:1 for the trigonal bipyramidal arrangement; for a tetragonal pyramidal structure the angle between the xy plane and the Sn-I bond is ∼35°.

Original languageEnglish
Pages (from-to)275-282
Number of pages8
JournalJournal of Radioanalytical Chemistry
Volume25
Issue number2
DOIs
Publication statusPublished - 1975

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Oxygen
Iodine
Isomers
Atoms
Spectrum Analysis
Spectroscopy
hexamethyldisiloxane
disiloxane

ASJC Scopus subject areas

  • Molecular Medicine
  • Radiology Nuclear Medicine and imaging

Cite this

Mössbauer study of the donor character of oxygen in Si-O bonds. / Csákvári, B.; Csákvári, E.; Gömöry, P.; Vértes, A.

In: Journal of Radioanalytical Chemistry, Vol. 25, No. 2, 1975, p. 275-282.

Research output: Contribution to journalArticle

Csákvári, B. ; Csákvári, E. ; Gömöry, P. ; Vértes, A. / Mössbauer study of the donor character of oxygen in Si-O bonds. In: Journal of Radioanalytical Chemistry. 1975 ; Vol. 25, No. 2. pp. 275-282.
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