I. A. Ronova

Electron diffraction study of the molecular structure of trimethylcyclopentadienylsilane

Abstract The molecular structure of trimethylcyclopentadienylsilane, C 5 H 5 Si(CH 3 ) 3 , has been studied by electron diffraction in the vapour phase. The Si atom is found to be bonded by the localized σ-bond with one of the cyclopentadienyl carbon atoms. The Siue5f8C bond distances are 1.90±0.01 A. The cyclopentadienyl ring has an “envelope” conformation, the dihedral angle between planar four- and three-membered fragments of the ring being 22±4°. The Siue5f8C bond makes an angle of 56±4° with the plane of the bent-out “envelope flap”. Assuming the equality of all Cue5f8H bond lengths and also of three Cue5f8C bond lengths within the planar four-membered fragment of the cyclopentadienyl ring, the following values are obtained: r (C-H) = 1.11± 0.02, r (Cue5f8C) = 1.53±0.03, r (Cue5fbC) = 1.40±0.02 A

Molecular structure of dirhenium decacarbonyl

Abstract The molecular structure of Re 2 (CO) 10 has been determined by electron diffraction methods and the following bond lengths found: Reue5f8Re 3.04, Reue5f8C 2.01 and Cue5f8O 1.16 A. Equatorial CO groups of neighbouring rhenium atoms are found to be in an eclipsed conformation.

Molecular structure of (tribromogermyl)manganese pentacarbonyl, Br3GeMn(CO)5

The Molecular Structure Of Br3gemn(co)5 Was Determined By Electron Diffraction and the following bond lengths were found: Mn–Ge 2.44, Ge–Br 2.31, Mn–C 1.84, C–O 1.16 A.

Electron diffraction study in the vapor phase of the molecular structure of dicyclopentadienylzirconium dichloride

Abstract The molecular structure of (C 5 H 5) ) 2 ZrCl 2 has been studied by electron diffraction in the vapor phase. The molecule is a wedge-like sandwich with the interring angle of 46° and bond distances of: Zrue5f8Cl 2.309, Zrue5f8C 2.522, Cue5f8C 1.42, Cue5f8H 1.13 A

Electron diffraction study in the vapour phase of the molecular structure of dicyclopentadienylnickel

Abstract The molecular structure of nickelocene, (C 5 H 5 ) 2 Ni, has been studied by electron diffraction in the vapour phase. The molecule has eclipsed configuration with Niue5f8C 2.160, Cue5f8C 1.41 and Cue5f8H 1.10 ». Cue5f8H bonds are bent out of the planes of the cyclopentadienyl rings towards the metal atom by 5°. This effect, which is general for dicyclopentadienyl sandwich compounds, is interpreted in terms of the new electron gas model as being a result of the repulsion between the electron clouds of the Cue5f8H bonds and the π-electron density of the cyclopentadienyl ring.