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Is rhodium tetroxide in the formal oxidation state VIII stable? a quantum chemical and matrix isolation investigation of rhodium oxides

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Abstract

The structures and reactions of different rhodium oxides and dioxygen complexes with RhO4 stoichiometry were investigated by matrix isolation infrared spectroscopy and quantum chemical calculations. The inserted RhO2 molecule reacted with dioxygen upon sample annealing to form the [(η1-O2)RhO2] complex, which can further isomerize to the known [(η2-O2)RhO2] complex via infrared irradiation. Both experimental and theoretical studies suggest that the [(η1-O2)RhO2] complex has a doublet ground state with non-planar C s symmetry in which the O2 ligand is end-on bonded to the rhodium centre. Although rhodium tetroxide is predicted to be a stable molecule with D 2d symmetry at different level of theory, no evidence is found for the formation of this Rh(VIII) species in noble gas matrices. Our experiments also suggest the formation of a new peroxo [Rh(η2-O2)2] complex, which is calculated to have a doublet ground state with D 2d symmetry. This peroxo complex undergoes isomerization to the known superoxo [Rh(η2-O2)2] complex via the rotation of the dioxygen ligand under infrared irradiation.

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Acknowledgments

The authors are grateful to I. Krossing and M. Kaupp for kindly providing computational resources. M.Z. thanks the National Basics Research Program of China (2007CB815203) and NSFC (20933003) for financial support. S.R. thanks the Fonds der Chemischen Industrie, the DFG and the Alexander von Humboldt Foundation for financial support. T.S. thanks the Institut für Analytische und Anorganische Chemie for financial support.

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Authors and Affiliations

  1. Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysts and Innovative Materials, Advanced Materials Laboratory, Fudan University, 200433, Shanghai, China

    Yu Gong & Mingfei Zhou

  2. Department of Chemistry, University of Virginia, Charlottesville, VA, 22904-4319, USA

    Lester Andrews

  3. Institut für Anorganische und Analytische Chemie, Albert-Ludwigs Universität Freiburg, Albertstrasse 21, 79104, Freiburg i. Br., Germany

    Tobias Schlöder & Sebastian Riedel

Authors
  1. Yu Gong
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  2. Mingfei Zhou
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  3. Lester Andrews
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  4. Tobias Schlöder
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  5. Sebastian Riedel
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Correspondence to Sebastian Riedel.

Additional information

Dedicated to Professor Pekka Pyykkö on the occasion of his 70th birthday and published as part of the Pyykkö Festschrift Issue.

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Gong, Y., Zhou, M., Andrews, L. et al. Is rhodium tetroxide in the formal oxidation state VIII stable? a quantum chemical and matrix isolation investigation of rhodium oxides. Theor Chem Acc 129, 667–676 (2011). https://doi.org/10.1007/s00214-011-0919-7

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  • DOI: https://doi.org/10.1007/s00214-011-0919-7

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