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Triosmium Carbonyl Clusters Containing a Mixture of Dppm and Dppe Ligands

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Abstract

Four osmium carbonyl complexes were synthesized via microwave heating by reacting either Os3(CO)12 or Os3(CO)10(\(\mu\)-dppm) with dppe, where dppm = bis(diphenylphosphino)methane and dppe = 1,2-bis(diphenylphosphino)ethane. Two of the complexes, Os3(µ-dppe)(CO)8(dppe) (1) and Os3(µ-dppm)(CO)8(dppe) (2), are the first examples of triangular triosmium clusters containing diphosphane ligands that exhibit both bridging and chelating coordination modes in the same molecule. Complexes 2 and [Os3(µ-dppm)(CO)9]2(µ-dppe) (3) are the first examples of triosmium clusters containing two different diphosphane ligands in the same molecule. Complexes 3 and [Os3(µ-dppe)(CO)9]2(µ-dppe) (4) are hexanuclear clusters containing two triangular Os3 units linked together by a bridging diphosphane ligand. Crystal structures for complexes 1–3 are reported.

Graphic Abstract

Two trinuclear cluster complexes, Os3(μ-dppe)(CO)8(dppe) (1) and Os3(μ-dppm)(CO)8(dppe) (2), and two hexanuclear cluster complexes, [Os3(μ-dppm)(CO)9]2(μ-dppe) (3) and [Os3(μ-dppe)(CO)9]2(μ-dppe) (4), were synthesized and characterized by X-ray crystal diffraction. Complexes 2 and 3 are the first examples of triangular triosmium clusters containing two different diphosphane ligands in the same molecule.

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Acknowledgements

We gratefully acknowledge financial support from The Welch Foundation (Grant No. R-0021), the Abilene Christian University Office of Undergraduate Research, and the Abilene Christian University Scholars Lab.

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  1. Department of Chemistry & Biochemistry, Abilene Christian University, 79699, Abilene, Texas, USA

    Emily R. Mikeska, Cynthia B. Powell & Gregory L. Powell

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  1. Emily R. Mikeska
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  2. Cynthia B. Powell
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  3. Gregory L. Powell
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Correspondence to Gregory L. Powell.

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Mikeska, E.R., Powell, C.B. & Powell, G.L. Triosmium Carbonyl Clusters Containing a Mixture of Dppm and Dppe Ligands. J Chem Crystallogr 51, 457–464 (2021). https://doi.org/10.1007/s10870-020-00869-8

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  • DOI: https://doi.org/10.1007/s10870-020-00869-8

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