Multiple Bonds between Main-Group Elements and Transition Metals. 130. (Cyclopentadienyl)trioxorhenium(VII): Synthesis, Derivatives, and Properties
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(η5-Cyclopentadienyl)trioxorhenium(VII) and ring-substituted derivatives are conveniently synthesized from (trifluoroacetyl)perrhenate and substituted (cyclopentadienyl)tin compounds. As shown by cyclovoltammetry, peralkylated (cyclopentadienyl)tin derivatives undergo redox reactions with Re(VII) precursor compounds such as (trifluoroacetyl)trioxorhenium(VII). The reduction potentials of peralkylated CpReVII systems differ significantly from those of the nonalkylated forms. Thermal stabilities of CpReO3 derivatives increase with the number of methyl groups in the Cp ring, reflecting increasing Re-C bond strengths resulting from the electron density of the π-bonded ligands. Increasing π-donor capability of the Cp ligands with increasing substitution by alkyl groups is documented in the IR and 17O NMR spectra. As shown by a single-crystal X-ray diffraction analysis of (C5H5)ReO3, the Cp ligand is η5-bonded to the metal. Crystal data: monoclinic P21/m, a = 5.984(1) Å, b = 9.179(1) Å, c = 6.099(1) Å, β = 116.30(1)°, R = 0.021 for 559 reflections. © 1994, American Chemical Society. All rights reserved.
author list (cited authors)
Kuehn, F. E., Herrmann, W. A., Hahn, R., Elison, M., Bluemel, J., & Herdtweck, E.