Add time:09/09/2019         Source:sciencedirect.com

The reaction of ScF3 with (C5H5)2Mg gives a mixture of (C5H5)3Sc and (η5-C5H5)2ScF, not pure (C5H5)3Sc as reported previously. The same mixture is obtained on treating ScF3 with C5H5Na in tetrahydrofuran. The two products can be separated since (η-C5H5)2ScF is soluble in toluene whereas (C5H5)3Sc is not. The structure of (η-C5H5)2ScF shows it to be trimeric with a planar (ScF)3 ring (average ScF distance 2.046(8) Å, FScF and ScFSc angles 86.5(3) and 153.4(4)°, respectively). Crystal data: monoclinic, Cc, a 17.019(8), b 15.273(7), c 10.359(8) Å, β 92.33(5)°, Z = 4; Mo-Kα radiation, R = 0.076 for 1238 observed reflections and 325 variables.

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