Synthesis and characterization of tetrairon-tungsten cluster complex containing a mu(4), eta(2)-carbonyl ligand

摘要

Reaction of [(PPh2C5H4)Cp3Fe4(CO)(4)] (1) with (CO)(4)W(CH3CN)(2) at ambient temperature affords [(CO)(4)W( PPh2C5H4)Cp3Fe4(CO)(4)] (2) as the major product, together with a small amount of [(CO)(5)W(PPh2C5H4) Cp3Fe4( CO) 4] ( 3). Compound 3 can be obtained in good yield by treating (CO)(5)W(CH3CN) with equal molar of 1, and reaction of 3 with Me3NO in acetonitrile solvent produces 2 exclusively. The crystal structures of 2 and 3 have been determined by an X-ray diffraction study. Compound 2 contains an interesting mu(4), eta(2)-CO ligand, where two electrons donated by the carbon atom are involved to bridge a Fe-3 face and two electrons from oxygen are donated to the tungsten(0) atom.