The crystal and molecular structure of the pentaco-ordinate complex tricarbonyl(triphenylphosphine)-σ-tetrafluoroethylcobalt(I)
- 1 January 1967
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc. A
- p. 2092-2098
- https://doi.org/10.1039/j19670002092
Abstract
Crystals of trans-HCF2·CF2·Co(CO)3PPh3 are monoclinic, a= 9·675, b= 19·99, c= 11·975 Å, β= 91° 22′, space-group P21/c, final R 0·108 for 889 reflections. This pentaco-ordinate cobalt complex has trigonal bipyramidal geometry with the phosphine and fluorethyl groups occupying the axial positions. The Co–C distance to the –C2F4H group (1·95 Å) is slightly shorter than the expected single-bond length. Evidence for weak multiple bonding between the cobalt atom and fluoroethyl group is discussed. The conformation of the –C2F4H group is such that the hydrogen atom is directed towards one of the equatorial carbonyl groups (distance 2·6 Å). The possibility of a hydrogen–carbonyl group interaction is discussed. The Co–P bond length is 2·27 Å. Bond lengths and angles of the triphenylphosphine group differ slightly from those of free triphenylphosphine in the expected way.Keywords
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