Synthesis and fluxional character of complexes of the type [Fe3H(CO)10(µ-CNR2)] and [Fe3H(CO)9(µ3–CHNR)]
Abstract
Sequential room-temperature carbonyl substitution of [N(PPh3)2][Fe3H(CO)11] with isonitriles CNR (R = Me, Et, or Pri) yields the substituted anions [N(PPh3)2][Fe3H(CO)11–x(CNR)x](x= 1 or 2), which on alkylation using R′3OBF4(R′= Me or Et) or acidification using CF3SO3H yield the complexes [Fe3H(CO)10(CNRR′)](R = R′= Et; R = Pri, R′= Me or Et; R = Me, R′= Et; R = Me, R′= H) and [Fe3H(CO)9,(CNRR′)(CNR)](R = R′= Et). At higher temperatures, an insertion of isonitrile into the M–H–M bond is observed to yield, after acidification, the complex [Fe3H(CO)9(CHNPri)]. The fluxional properties of these molecules are discussed.