Issue 6, 1981

Spectroscopic study of the structures of [M2(η-C5H5)2(CO)n(CNR)4 –n] complexes (n= 1 or 2; M = Fe or Ru) in solution. The structure of cis-[(η-C5H5)(OC)Fe(µ-CO)(µ-CNPri)Fe(CNPri)(η-C5H5)] in the solid state

Abstract

Various [M2(η-C5H5)2(CO)n(CNR)4 –n] complexes have been prepared [n= 2, M = Fe, R = Ph, p-ClC6H4CH2, PhCH2, p-MeC6H4CH2, p-MeOC6H4CH2, D(+)-Ph(Me) CH, Me, Et, Prn, Bun, Prl, C6H11, or But; M = Ru, R = Pri; n= 1, M = Fe, R = Me, Et, or Pri]. In solution, they exist as rapidly interconverting equilibrium mixtures of isomers; where n= 2, the RNC ligands are less likely to adopt bridged as opposed to terminal co-ordination as R is varied along the above series. The isomer distribution is a consequence of electron-withdrawing R favouring µ-CNR co-ordination and, less importantly, the more bulky R favouring terminal CNR. Where n= 1, only one predominant isomer is observed in solution. The crystal and molecular structure of cis-[Fe2(η-C5H5)2(COt)-(CNRt)(COµ)(CNRµ)](R = Pri) has been determined by an X-ray diffraction study. It has been solved by the heavy-atom method from photographic data and refined by full-matrix least squares to R= 0.103 for 807 non-zero unique reflections. Crystals are monoclinic with space group P21/c(no. 14), Z= 4, a= 13.881 ± 0.015, b= 10.755 ± 0.010, c= 15.262 ± 0.015 Å, and β= 112.5 ± 0.1°.

Article information

Article type
Paper

J. Chem. Soc., Dalton Trans., 1981, 1251-1259

Spectroscopic study of the structures of [M2(η-C5H5)2(CO)n(CNR)4 –n] complexes (n= 1 or 2; M = Fe or Ru) in solution. The structure of cis-[(η-C5H5)(OC)Fe(µ-CO)(µ-CNPri)Fe(CNPri)(η-C5H5)] in the solid state

M. Ennis, R. Kumar, A. R. Manning, J. A. S. Howell, P. Mathur, A. J. Rowan and F. S. Stephens, J. Chem. Soc., Dalton Trans., 1981, 1251 DOI: 10.1039/DT9810001251

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