Journal of the American Chemical Society, Vol.131, No.10, 3493-3498, 2009
2-Indenylidene Pincer Complexes of Zirconium and Palladium
IndH(2)(Ph2P=X)(2)] derivatives (1, X = NMes; 4, X = S) react with [Zr(NMe2)(4)] and [PdCl2(cod)] to afford the complexes {[Ind(Ph(2)PNMes)(2)]Zr(NMe2)(2)} (3), {[lnd(Ph2PS)(2)]Zr(NMe2)(2)} (5), and {[Ind(Ph2PS)(2)]Pd(HNc-Hex(2))} (7). The ability of the phosphazene and thiophosphinoyl side arms to support the coordination of the indenyl ring as 2-indenylidene was evidenced by NMR spectroscopy and X-ray diffraction studies. Analysis of the bonding situation by density functional theory calculations revealed a strong a interaction but a negligible (if any) pi interaction between C2 and the metal.