1,1,2,2,2,3,3,3-Octa-carbonyl-1,1,2,3-tetra-kis-(1,3,5-tri-aza-7-phosphatri-cyclo-[3.3.1.13,7]decane-κ P)- triangulo-triosmium(0)

David M Marolf; Kristen L Brehm; Vincent M Lynch; Gregory L Powell

doi:10.1107/S2414314620009359

1,1,2,2,2,3,3,3-Octa-carbonyl-1,1,2,3-tetra-kis-(1,3,5-tri-aza-7-phosphatri-cyclo-[3.3.1.1^3,7]decane-κ P)- triangulo-triosmium(0)

IUCrdata. 2020 Jul 17;5(Pt 7):x200935. doi: 10.1107/S2414314620009359. eCollection 2020 Jul.

Authors

David M Marolf¹, Kristen L Brehm¹, Vincent M Lynch², Gregory L Powell¹

Affiliations

¹ Department of Chemistry & Biochemistry, Abilene Christian University, Abilene, Texas 79699-8132, USA.
² Department of Chemistry, University of Texas, Austin, Texas 78712, USA.

Abstract

The title compound, [Os₃(C₆H₁₂N₃P)₄(CO)₈], crystallizes in the ortho-rhom-bic space group Pbca with Z = 8. The mol-ecule consists of a triangular triosmium(0) core surrounded by eight carbonyl ligands and four 1,3,5-tri-aza-7-phosphatri-cyclo-[3.3.1.1^3,7]decane (or PTA) ligands. One Os atom is coordinated by two PTA ligands and two CO ligands, while the other two Os atoms are each bonded to a single PTA ligand and three CO ligands. There is a small disorder associated with the Os₃ unit so that a minor orientation has an occupancy of 2.17 (4)%. The title compound represents the first structurally characterized triangular Os₃ carbonyl cluster with four monodentate tertiary phosphane ligands.

Keywords: PTA ligands; crystal structure; osmium carbonyl; trinuclear cluster.

Grants and funding

Funding for this research was provided by: The Welch Foundation (grant No. R-0021).