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- W2017678972 abstract "The reaction between the salt [Rh(NCMe)3(η-C5Me5)][BF4]2 and the reagents Na2[M(CO)3(η5-7,8-C2B9H9R′2)](M = Mo or W, R′= H or Me) in tetrahydrofuran affords [Rh(CO)2(η-C5Me5)] and the trimetal complexes [MRh2(µ-H)(µ-CO)(µ-σ:η5-7,8-C2B9H8R′2)(CO)2(η-C5Me5)2]. An X-ray diffraction study of the compound with M = W and R′= Me revealed a structure based on a triangulated metal core [Rh(1)–Rh(2) 2.859(1), W–Rh(1) 2.736(1), W–Rh(2) 2.822(1)Å] with the Rh–Rh bond bridged by a hydrido ligand. Two of the carbonyl groups are terminally attached to the tungsten atom, while the third [W–C–O 154(1)°] semi-bridges a W–Rh bond. The open pentagonal C2B3 face of the carbaborane framework is η5 co-ordinated to the tungsten, but the cage also bridges the metal triangle through exopolyhedral B–Rh and B–H⇀Rh bonds, using boron atoms in the C2B3 ring attached to the tungsten. The B–Rh bond bridges the W–Rh vector which is asymmetrically bridged by the CO group, and involves the boron atom α to the carbons in the CCBBB ring. The B–H⇀Rh three-centre two-electron bond utilises the boron atom which is β to the carbons in the CCBBB ring. Examination of the NMR spectra (1H, 13C-{1H}, 11B-{1H}, 11B) of the trimetal complexes revealed that the structures of these molecules at –60 °C were similar to that established in the solid state for M = W and R′= Me. However, at ambient temperatures three of the complexes (M = Mo, R′= H or Me; M = W, R′= Me) isomerised to a structure [MRh2(µ-H)2(µ-CO)(µ-σ:σ′:η5-7,8-C2B9H7R′2)(CO)2(η-C5Me5)2] in which the carbaborane cage bridged the metal triangle via two B–Rh bonds." @default.
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- W2017678972 title "Tricarbonyl(carbaborane) complexes of the Group 6 metals as reagents for preparing heteronuclear trimetal compounds involving rhodium" @default.
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- W2017678972 doi "https://doi.org/10.1039/dt9930003559" @default.
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