Issue 13, 1993

The molecular structure of (η5-cyclopentadienyl)-bis(ethene)rhodium determined by gas-phase electron diffraction

Abstract

The molecular structure of [Rh(η5-C5H5)(C2H4)2] has been determined in the gas phase by electron diffraction at 473 K. The molecule has C2v local symmetry for the Rh(C2H4)2 fragment and C5v for the Rh(C5H5) fragment, with the local rotation axes coincident. The distance from the rhodium atom to the center of the cyclopentadienyl ring is 190.7(3) pm, and that from the rhodium atom to the centres of the C–C bonds of the ethene ligands is 198.0(3) pm. The C–C bond distances in the cyclopentadienyl ligands refined to 143.2(2) pm, as expected for such five-co-ordinated rings, but the C–C bonds of the ethene ligands. [145.7(7) pm] are longer than those previously reported for rhodium-ethene compounds. The angle between the lines linking the midpoints of the C[double bond, length half m-dash]C bonds of the ethene ligands to the rhodium atom is not uniquely determined by the electron diffraction data, and models with values of 91.2(13) and 111.8(12)° both fit well. The former value is preferred, as it gives a lower R factor, and is consistent with corresponding angles reported for bis(ethene) complexes in th e crystalline phase. The two ethene ligands are tilted about their C[double bond, length half m-dash]C axes away from one another by 11.7(18)°.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1993, 1983-1986

The molecular structure of (η5-cyclopentadienyl)-bis(ethene)rhodium determined by gas-phase electron diffraction

R. Blom, D. W. H. Rankin, H. E. Robertson and R. N. Perutz, J. Chem. Soc., Dalton Trans., 1993, 1983 DOI: 10.1039/DT9930001983

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Spotlight

Advertisements