Synthesis of cationic iron complexes with the cyclobutenylidene ligand. The crystalline structure of 1-triphenylphosphonium-2-phenylvinyl-η 5-cyclopentadienyldicarbonylirontetrafluoroborate

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Stable, cationic, binuclear iron complexes with a new cyclobutenylidene bridge ligand {[Cp(CO) 2Fe] 2(Ph 2C 4H)} + X − (X = ClO 4, BF 4) have been obtained by protonating the σ-phenylacetylide iron complex Cp(CO) 2FeCCPh with the strong protonic acids HClO 4 or HBF 4 in acetic anhydride. In the presence of PPh 3 this reaction results in the formation of metal—vinyl complexes containing the phosphonium cation {Cp(CO) 2Fe[C(PPh 3)CHPh]} + X − (X = ClO 4, BF 4). When Cp(CO) 2FeCCPh reacts with HClO 4 or HBF 4 in benzene, acetone or alcohol, [CpFe(CO) 3] + X − ionic complexes (X = ClO 4, BF 4) are formed. The structure of the above compounds has been confirmed by IR, 1H and 13C NMR spectra and X-ray analysis.