Dinuclear hydride and η3-bonded dithioformate complexes of iron(II)

Iron(II) chloride reacts consecutively with bis(diphenylphosphino)methane (dppm), activated magnesium and cyclopentadiene to give the mono- and di-iron hydrides [FeH(η-C5H5)(dppm)]1 and [{Fe(η-C5H5)}2(µ-H)(µ-PPh2)(µ-dppm)]2. Compound 2 contains three bridging units (average separation of the hydride from the metal atoms, 1.73 A) in the solid state and crystallizes in the space group P21/c with a= 10.004(2), b= 20.134(7), c= 19.353(10)A, β= 95.00(3)° and Z= 4. Compound 1 reacts with CS2 to form the dithioformate complex [Fe(η-C5H5)(dppm-P)(S2CH)]4. The sulfur-donor ligand is η3 co-ordinated in solution.