Browsing by Author "Venter, Johan A."

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    Crystal structure of dicarbonyl (μ2-indole-2-carboxylato κ2 O:O′)tris(triphenylarsine-κAs)dirhodium(I) acetone solvate, C68H56As3NO5Rh2
    (De Gruyter, 2024) Alexander, Orbett T.; Elmakki, Mohammed A.; Venter, Johan A.
    Background: The complex was synthesized starting with the reduction of hydrated RhCl3 in DMF which was refluxed for approxi mately 20 min to give a yellow solution of di-μ-chloro-tetra carbonyldirhodium(I), [RhCl(CO)2]2. 5–7 The addition of an equivalent amount of indol-2-carboxylic acid (indol(H2)) to the aforementioned yellow solution followed by addition of ice water yielded the dicarbonylrhodium(I) complex, [RhI(indol)(CO)2] by precipitation. The anion formed by double deprotonation of the indole-2-carboxylic acid (indol(H2)) ligand displays an unprecedented and unex pected mode of coordination with Rh(I) by forming bridging ligand to two rhodium centers; the ketonic oxygen atom coordinating (κO) to the Rh2 atom, while the N,O atoms bind to a second rhodium atom Rh1 atom in the more familiar bidentate (κN,O) fashion. The dinuclear title complex sim plifies as [Rh(indol)(CO)(AsPh3)Rh(CO)(AsPh3)2].8 [Rh(indol)(- CO)(AsPh3)Rh(CO)(AsPh3)2] was synthesized by dissolving [Rh(indol)(CO)2] (0.0412 g, 0.1291 mmol) in 5 cm3 of acetone. Triphenylarsine (AsPh3) (0.0396 g, 0.1291 mmol) was added to the solution with stirring, resulting in the immediate evolution of CO gas. After a few minutes the reaction was completed as determined by IR spectroscopy. Ice water was added drop-wise to the solution. A yellow precipitate was filtered off and dried.