Molecular geometry of monomeric and dimeric aluminum tribromide from gas phase electron diffraction

M. Hargittai, M. Kolonits, Lajos Gödörházy

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Aluminum tribromide is present in the vapor phase in an equilibrium of monomeric and dimeric forms, with increasing amount of monomers as the temperature of the vapor increases. The molecular geometry of both forms has been determined by high-temperature electron diffraction, the monomer at 830 K and the dimer at 360 K. The electron diffraction investigation was coupled with quadrupole mass spectrometry. The monomer molecule is planar with rg(Al-Br)=2.231 ± 0.005 Å [ra(Al-Br)=2.216 ± 0.005 Å]. The dimer has a halogen-bridged structure with bond lengths of rg(Al-Br)t= 2.227 ± 0.005 Å and rg(Al-Br)b=2.421 ± 0.005 Å and bond angles 〈aBrb-Al-Brb=93.3 ± 0.2° and 〈aBrt-Al-Brt= 119.6 ± 0.7°.

Original languageEnglish
Pages (from-to)321-326
Number of pages6
JournalChemical Physics Letters
Volume257
Issue number3-4
Publication statusPublished - Jul 26 1996

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Aluminum
Electron diffraction
electron diffraction
monomers
Monomers
Gases
vapor phases
aluminum
Dimers
Geometry
geometry
Vapors
dimers
Halogens
Bond length
halogens
Mass spectrometry
mass spectroscopy
quadrupoles
vapors

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Spectroscopy
  • Atomic and Molecular Physics, and Optics

Cite this

Molecular geometry of monomeric and dimeric aluminum tribromide from gas phase electron diffraction. / Hargittai, M.; Kolonits, M.; Gödörházy, Lajos.

In: Chemical Physics Letters, Vol. 257, No. 3-4, 26.07.1996, p. 321-326.

Research output: Contribution to journalArticle

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abstract = "Aluminum tribromide is present in the vapor phase in an equilibrium of monomeric and dimeric forms, with increasing amount of monomers as the temperature of the vapor increases. The molecular geometry of both forms has been determined by high-temperature electron diffraction, the monomer at 830 K and the dimer at 360 K. The electron diffraction investigation was coupled with quadrupole mass spectrometry. The monomer molecule is planar with rg(Al-Br)=2.231 ± 0.005 {\AA} [ra(Al-Br)=2.216 ± 0.005 {\AA}]. The dimer has a halogen-bridged structure with bond lengths of rg(Al-Br)t= 2.227 ± 0.005 {\AA} and rg(Al-Br)b=2.421 ± 0.005 {\AA} and bond angles 〈aBrb-Al-Brb=93.3 ± 0.2° and 〈aBrt-Al-Brt= 119.6 ± 0.7°.",
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N2 - Aluminum tribromide is present in the vapor phase in an equilibrium of monomeric and dimeric forms, with increasing amount of monomers as the temperature of the vapor increases. The molecular geometry of both forms has been determined by high-temperature electron diffraction, the monomer at 830 K and the dimer at 360 K. The electron diffraction investigation was coupled with quadrupole mass spectrometry. The monomer molecule is planar with rg(Al-Br)=2.231 ± 0.005 Å [ra(Al-Br)=2.216 ± 0.005 Å]. The dimer has a halogen-bridged structure with bond lengths of rg(Al-Br)t= 2.227 ± 0.005 Å and rg(Al-Br)b=2.421 ± 0.005 Å and bond angles 〈aBrb-Al-Brb=93.3 ± 0.2° and 〈aBrt-Al-Brt= 119.6 ± 0.7°.

AB - Aluminum tribromide is present in the vapor phase in an equilibrium of monomeric and dimeric forms, with increasing amount of monomers as the temperature of the vapor increases. The molecular geometry of both forms has been determined by high-temperature electron diffraction, the monomer at 830 K and the dimer at 360 K. The electron diffraction investigation was coupled with quadrupole mass spectrometry. The monomer molecule is planar with rg(Al-Br)=2.231 ± 0.005 Å [ra(Al-Br)=2.216 ± 0.005 Å]. The dimer has a halogen-bridged structure with bond lengths of rg(Al-Br)t= 2.227 ± 0.005 Å and rg(Al-Br)b=2.421 ± 0.005 Å and bond angles 〈aBrb-Al-Brb=93.3 ± 0.2° and 〈aBrt-Al-Brt= 119.6 ± 0.7°.

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