Abstract
A single crystal X-ray structure analysis of FePt 2(CO) 5[P(OPh) 3] 3 has been caried out in order to clarify its stereochemistry. The complex crystallizes in the triclinic space group P 1 with a = 22.80(2), b = 12.31(1), c = 10.55(1) Å, α = 105.2(1)°, β = 78.0(1)°, γ = 88.6(1)°, Z = 2. Diffractometer data have been refined by least-squares methods to a final R of 0.062 for 2353 reflections. The molecule contains a triangular FePt 2 cluster to which the ligands bound as follows: four CO groups about iron distorted octahedral geometry, the fifth carbonyl and the phosphite ligands about the platinums giving distorted square-planar geometries. The metal—metal distances in the cluster are shorter than expected for single bonds with values of 2,633(1) Å for PtPt, and 2.550(5), 2.583(6) Å for FePt. The platinum—phosphite interactions have a mean value of 2.22 Å, and are shorter than the platinum—phosphine distances found in a variety of structures.
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