摘要：

The reaction of the square-planar iridium(I) η2-cyclooctene complex, Ir(η2-C8H14)[N(SiMe2CH2PPh2)2], with excess 1,3-butadiene generates excellent yields of the five-coordinate iridium(I) 1,3-butadiene complex, Ir(C4H6)[N(SiMe2CH2PPh2)2]. Both the NMR spectral data and the single crystal X-ray structure reveal that the tridentate amido-diphosphine ligand is coordinated in a quasi facial manner and the 1,3-butadiene unit is bound in a s-cis-η4-π mode with some σ2-π component to the bonding. In solution, the butadiene complex shows no fluxional behaviour even at temperatures as high as 85δC.

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