Rh →\nSb Interactions Supported by Tris(8-quinolyl)antimony\nLigands

The ligands tris(8-quinolyl)stibine and tris(6-methyl-8-quinolyl)stibine\nhave been synthesized and complexed to rhodium using (MeCN)<sub>3</sub>RhCl<sub>3</sub>. The resulting complexes feature an unusual [RhSb]<sup>VI</sup> core as a result of the formal insertion of the antimony\ncenter into one of the Rh–Cl bonds. Computational analysis\nusing density functional theory (DFT) methods reveals that the resulting\nRh–Sb σ bond is polarized toward the Rh atom, suggesting\na description of this linkage as a Rh → Sb Z-type interaction.