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-[3.3.1.13,7]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.
Highlights
The title compound, [Os3(C6H12N3P)4(CO)8], crystallizes in the orthorhombic space group Pbca with Z = 8
The molecule consists of a triangular triosmium(0) core surrounded by eight carbonyl ligands and four 1,3,5-triaza-7-phosphatricyclo[3.3.1.13,7]decane 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
Summary
The water-soluble, air-stable, and non-toxic phosphane ligand 1,3,5-triaza-7-phosphatricyclo[3.3.1.13,7]decane (PTA) is often used in attempts to prepare metal complexes that are soluble in water (Phillips et al, 2004; Bravo et al, 2010). Cax—Ru—Ru—Cax torsion angles in the latter two are similar to that in the title complex with 35 (3) for L = P(OMe) and 30 (2) for L = P(OPh)3 Such torsional twisting was noted in the cases of Ru3(CO)9(PTA) and Os3(CO)9(PTA), albeit to a significantly lower degree with average Cax—M—M—Cax torsion angles of 19 (2) and 17 (2), respectively (Mager et al., 2015; Dugan et al, 2016). Complex associated with the triangular Os3 unit so that two different orientations are observed with a 0.9783 (4)/ 0.0217 (4) ratio of major-to-minor components (Fig. 3) This type of disorder is rather common in M3(CO)12–xLx complexes in which M = Ru or Os. For example, a 50/50 disorder of the M3 unit exists in Os3(CO)6[P(OMe)3]6, Ru3(CO)8(PMe2Ph), and Ru3(CO)8[P(OEt)3]4, while an 85/15 disorder is present in Ru3(CO)8[P(OMe)3]4 (Alex et al, 1987; Bruce et al, 1989)
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