Complexes of the type [FeCl,(diphosphine),] [FeCl,] and [FeCl,(diphosphine),] have been prepared from tertiary diphosphines of the types C,H,(PR,), (R = Me or Et) and o-C,+,(PEt,),.From these were prepared monohydrides [FeHX(diphosphine) 2] (X = halogen) and a dihydride [FeH,{ o-C,H,(PEt,),),] by reduction with lithium aluminium hydride. These have a band in the 1720-1880 cm.-l region due to vFe-H, and the Fe-hydrogen atoms show large chemical shifts (up to 39.1 p.p.m.; water standard) in the nuclear magnetic resonance spectrum. The hydrides are oxidised readily in air but show surprising thermal stability, which is attributed to the large ligand field strength of the phosphine ligands and hydride ion.
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