Journal ArticleDOI
Electron-diffraction study of the molecular structure of tetramethyldiphosphine
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The molecular structure of tetramethyldiphosphine in the gas phase has been determined by electron diffraction as mentioned in this paper, which required a gas-nozzle temperature of 170°C, obtained by using hot compressed air.Abstract:
The molecular structure of tetramethyldiphosphine in the gas phase has been determined by electron diffraction. The study required a gas-nozzle temperature of 170°C, obtained by using hot compressed air. The molecule can be described by seven structural parameters from which all the 52 different interatomic distances can be calculated. All 52 distances were included in the full-matrix least-squares refinements which were performed. The final values of the seven independent parameters are C—H = 1.109±0.009 A, C—P = 1.853±0.003 A, P—P = 2.192±0.009 A, ∠CPC = 99.6±1.0°, ∠PCH = 108.8±2.5°, ∠CPP = 101.1±0.7°, and ϕ, the dihedral angle expressing the relative orientation of the dimethylphosphino groups, is 164±23°, measured from the cis configuration. The parameters of the dimethylphosphino groups are very similar to the corresponding values for the methyl phosphines. The P—P bond length is at the low end of a range of literature values for this bond. The apparent deviation of 16° from the trans configuration is possibly due to a shrinkage effect involving a low frequency torsional oscillation about the P—P bond.read more
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Journal ArticleDOI
Electron-diffraction studies of tetramethylsilane and hexamethyldisilane, and discussion of the lengths of Si-C bonds
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Journal ArticleDOI
Electron diffraction studies of the hydrides Si2H6 and P2H4
TL;DR: In this article, the molecular structures of disilane and diphosphine have been studied in the gas phase by electron diffraction, and the P-P bond length in P2H4 is 0.021 ± 0.003 A shorter than found in silicon.
Journal ArticleDOI
Spontaneous generation of stable pnictinyl radicals from "jack-in-the-box" dipnictines: A solid-state, gas-phase, and theoretical investigation of the origins of steric stabilization
Sarah L. Hinchley,Carole A. Morrison,David W. H. Rankin,Charles L. B. Macdonald,Robert J. Wiacek,Andreas Voigt,Alan H. Cowley,Michael F. Lappert,Grete Gundersen,Jason A. C. Clyburne,Philip P. Power +10 more
TL;DR: Structural investigations demonstrate that large distortions of the ligands attached to Pn occur when the pnictinyl radicals unite to form the corresponding dipnictine dimers, and allows a deeper understanding of the functioning of sterically demanding substituents.
Book ChapterDOI
The geometric and dynamic structures of fluorocarbons and related compounds.
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Journal ArticleDOI
Conformational analysis of 1,1,2,2-tetraaryl-disilanes
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