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A rare example of a di-cationic hydrido carbonyl tetra-nuclear cluster, [H2Rh2Pt2(CO)7(PPh3)3] |
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| Authors: | Brian T Heaton Jonathan A Iggo Vadim I Ponomarenko Sergey P Tunik |
| Institution: | a Department of Chemistry, University of Liverpool, P.O. Box 147, Liverpool L69 7ZD, UK b S.V. Lebedev Central Synthetic Rubber Research Institute, Gapalskaya 1, St. Petersburg 198035, Russia c Department of Chemistry, St. Petersburg University, Universitetskii pr. 26, St. Petersburg 198504, Russia |
| Abstract: | Addition of excess CF3CO2H (HTFA) to Rh2Pt2(CO)7(PPh3)3], I, under nitrogen results in the formation of a salt (X2+ Y2−), which contains only the second example of a di-cationic carbonyl hydride tetra-nuclear cluster, H2Rh2Pt2(CO)7(PPh3)3]2+, X2+, and a presently partially characterized polymetallic anion Y2−. The di-cation X2+ has been characterized by mass spectrometry and a variety of multinuclear NMR methods. Since there is no difference in the electron count for I and X2+, it is probable that both I and X2+ adopt similar butterfly metallic frameworks with a Rh-Rh hinge; in X2+, there are two bridging hydrides to the same wing-tip Pt but the phosphine site occupancies on the Rh2Pt2-framework in I and X2+ are different. |
| Keywords: | Carbonyl clusters Hydride ligands Phosphane ligand site occupancy Structure elucidation NMR spectroscopy |
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