Abstract
In the series of the tetranuclear mixed-metal clusters LWM3(CO)12H, L = C5H5, C5Me5 and M = Os, Ru, the cluster cores adapt different geometries from tetrahedron (isomer a), distorted tetrahedron (isomer b) to butterfly arrangement (isomers c and d) in the solid state (see scheme 1). For the last two butterfly isomers, a CO ligand adapted a π-bonded μ 4-η 2 bridging mode (as a four electron donor) to stabilize the cluster. In solution state, these isomers undergo rapid interconversion on the time scale of 1H NMR spectroscopy, suggesting that the π-bonded CO ligands is in equilibrium with the regular, terminal or doubly bridging CO ligands. Hydrogenation of LWM3(CO)12H in refluxing toluene solution produces LWM3(CO)11H3 which adapted a tetrahedral cluster core structure. The fluxionaity of these hydride complexes in solution will be discussed.
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© 1990 Springer Science+Business Media New York
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Chi, Y., Wang, SL., Peng, SM. (1990). Facile Exchange of Terminal, Doubly Bridging, and Quadruply Bridging Carbonyl Ligands in Solution: Crystal Structure and Solution Dynamics of LWM3(CO)12H, L=C5H5, C5Me5 and M=Os, Ru. In: Fackler, J.P. (eds) Metal-Metal Bonds and Clusters in Chemistry and Catalysis. Industry-University Cooperative Chemistry Program Symposia. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2492-6_23
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DOI: https://doi.org/10.1007/978-1-4899-2492-6_23
Publisher Name: Springer, Boston, MA
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