Synthesis and fluxional character of complexes of the type [M2(cp)2(CO)3(CNR)](M = Fe or Ru, cp =η-C5H5)
Abstract
Infrared and 13C and 1H n.m.r. data for the complexes [M2(cp)2(CO)3(CNR)][cp =η-C5H5, M = Fe, R = Me, C2H5, CH(CH3)2, C(CH3)3, or Ph; M = Ru, R = Me, C2H5, CH(CH3)2, or C(CH3)3] show that, in solution, mixtures of isomers containing bridging and terminal isonitrile ligands exist; the n.m.r. results may be interpreted in terms of the Adams–Cotton mechanism. N.m.r. (1H and 13C) spectra for [Os2(cp)2(CO)4] have also been recorded. The protonated and alkylated derivatives [M2(cp)2(CO)3(CNHR)][PF6][M = Fe, R = CH3, C2H5, CH(CH3)2, C(CH3)3, or Ph; M = Ru, R = C2H5] and [Fe2(cp)2(CO)3(CNRR′)][PF6][R = CH3 or CH(CH3)2; R′= C2H5] have also been prepared and their 13C and 1H n.m.r. spectra recorded.
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