Microwave molecular structure measurements for tetracarbonyldihydroosmium, a classical dihydride

Stephen G Kukolich, S. M. Sickafoose, S. M. Breckenridge

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19 Citations (Scopus)

Abstract

Microwave rotational spectra for six isotopomers of H2Os(CO)4 were measured in the 4-12 GHz range using a Flygare-Balle-type spectrometer. The 18 rotational constants from these isotopomers were used to determine eight structural parameters describing the gas-phase structure of this complex. This near-octahedral complex has C2v symmetry and the dipole moment lies along the c-principal axis for the normal isotopomer. The distance between H atoms, obtained directly from experimental structural parameters, is rHH = 2.40(2) Å. This rather long H-H distance indicates that this is clearly a "dihydride" rather than a "dihydrogen" complex. The Os-H bond lengths are rOsH = 1.72(1) Å. The osmium-carbonyl carbon bond lengths for axial and equatorial carbonyl groups are rOsC1 = 1.96(1) Å and rOsC3 = 1.97(2) Å. Results for other structural parameters obtained using least-squares fitting and the structural parameters obtained using the Kraitchman method are presented and discussed. No evidence for internal motion was observed for this complex.

Original languageEnglish (US)
Pages (from-to)205-208
Number of pages4
JournalJournal of the American Chemical Society
Volume118
Issue number1
StatePublished - Jan 10 1996

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Osmium
Bond length
Carbon Monoxide
Microwaves
Molecular Structure
Least-Squares Analysis
Molecular structure
Carbon
Gases
Dipole moment
Phase structure
Spectrometers
Atoms

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Microwave molecular structure measurements for tetracarbonyldihydroosmium, a classical dihydride. / Kukolich, Stephen G; Sickafoose, S. M.; Breckenridge, S. M.

In: Journal of the American Chemical Society, Vol. 118, No. 1, 10.01.1996, p. 205-208.

Research output: Contribution to journalArticle

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abstract = "Microwave rotational spectra for six isotopomers of H2Os(CO)4 were measured in the 4-12 GHz range using a Flygare-Balle-type spectrometer. The 18 rotational constants from these isotopomers were used to determine eight structural parameters describing the gas-phase structure of this complex. This near-octahedral complex has C2v symmetry and the dipole moment lies along the c-principal axis for the normal isotopomer. The distance between H atoms, obtained directly from experimental structural parameters, is rHH = 2.40(2) {\AA}. This rather long H-H distance indicates that this is clearly a {"}dihydride{"} rather than a {"}dihydrogen{"} complex. The Os-H bond lengths are rOsH = 1.72(1) {\AA}. The osmium-carbonyl carbon bond lengths for axial and equatorial carbonyl groups are rOsC1 = 1.96(1) {\AA} and rOsC3 = 1.97(2) {\AA}. Results for other structural parameters obtained using least-squares fitting and the structural parameters obtained using the Kraitchman method are presented and discussed. No evidence for internal motion was observed for this complex.",
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