Abstract
The crystal structure of (η 5-C 5H 5) 2Ti(CO) 2 has been determined from singlecrystal X-ray diffraction data collected by counter methods. Dicarbonyldicyclopentadienyltitanium(II) crystallizes in the orthorhombic space group Pnma with lattice constants a = 7.837(9), b = 11.475(8), c = 12.232(8) Å, and ϱ c = 1.41 g cm −3 for Z = 4. Least-squares refinement gave a final conventional R value of 0.086 for 648 independent observed reflections. The molecule, which resides on a crystallographic mirror plane that passes through the cyclopentadienyl groups, possesses almost exact C 2ν point symmetry. The TiC(carbonyl) bond length is 2.030(11) Å, while the average TiC(η 5) distance is 2.347(13) Å. The CTiC bond angle is 87.6(6)°, and the ring centerTiring center angle is 138.6°.
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