Reactions of the µ-alkyne dimer [W2(η-C5H4Pri)2Cl4(µ-C2Et2)]: synthesis and bonding analysis of a µ-alkyne–µ-imido bridged ditungsten complex

Abstract

The new compounds [W₂(η-C₅H₄Prⁱ)₂Cl₃(PR₃)(µ-Cl)(µ-C₂Et₂)](PR₃= PMe₃2a, PMe₂Ph 2b, PH₂Ph 2c or PPh₂H 2d), [W₂(η-C₅H₄Prⁱ)₂Cl₃(PMe₃)(µ-Cl)]3, [W₂(η-C₅H₄Prⁱ)₂Cl₂(PMe₃)₂(µ-C₂Et₂)]4, [W₂(η-C₅H₄Prⁱ)₂Cl₂(PMe₃)(µ-C₂Et₂)]5, [W₂(η-C₅H₄Prⁱ)₂Cl₃(OEt)(µ-C₂Et₂)]6, [W₂(η-C₅H₄Prⁱ)₂Cl₃(SMe)(µ-C₂Et₂)]7 and [W₂(η-C₅H₄Prⁱ)₂Cl₂(µ-NR)(µ-C₂Et₂)](R = H 8a, Me 8b or Ph 8c) have been prepared. The crystal structures of compounds 2a and 8c have been determined. The compounds 8a–8c contain a three-centre, two-electron W–N–W ‘banana’π bond.