Organometallics p. 766 - 771 (1986)
Update date:2022-09-26
Topics:
Lilga, Michael A.
Sohn, Youn Soo
Ibers, James A.
New five-coordinate Ir(I) alkyl complexes have been prepared by the addition of LiR (R = CH3, C5H5) to [Ir(dppe)2]Cl (dppe = 1,2-bis(diphenylphosphino)ethane). IrMe(dppe)2 is found to be very reactive toward acid, forming cis-IrH(Me)(dppe)2+, and toward CO and CO2. In contrast, the cyclopentadienyl complex [Ir(dppe)2]Cp is ionic and shows the reactivity of the Ir(dppe)2+ cation. That this complex is ionic is apparently not a result of steric constraints. A X-ray structural study of IrMe(dppe)2 indicates that the coordination geometry about the Ir center is that of a distorted trigonal bipyramid with the Me group in an axial position; Ir-Me = 2.189 (8) ?.
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