Rhodium tetrafluoride

Rhenium tetrachloride oxide, 4167 Rhodium(III) chloride, 4155 Rhodium tetrafluoride, 4349 Ruthenium(III) chloride, 4156 Silver chloride, 0008... 

Binary rhodium(lV) compounds are confined to the purple red tetrafluoride and the black dioxide. The hydrated dioxide may be prepared by oxidizing rhodium(IIl) compounds, either with chlorine or electrochemically. Attempts to dehydrate this material lead to decomposition. No cationic rhodium(IV) complexes have been characterized unambiguously, but both [RhCle] -and [RhFe] are well established. The alkali metal salts of the hexafluororhodate(lV) ion are all isomorphous with their platinate(fV) analogs. 

Three binary fluorides of rhodium have been reported a trifluoride, a tetrafluoride, and a hexafluoride. Rufi and Ascher obtained the trifluoride, plus a small amount of red-brown sublimate, by the fluorination of rhodium at SOO-600°, and suggested that the sublimate was either a tetrafluoride or a pentafluoride. Sharpe, in his report of the tetrafluoride, concluded that this was identical with Rufi and Ascher s sublimate. The... 

The establishment of pentafluorides of rhodium and iridium [5] as well as the trifluorides raised the possibility of each element also making a tetrafluoride[17]. On the other hand the mixed oxidation state character [13] of PdFj (Pd(II)Pd(IV)F6) raised the possibility of the tetrafluorides RhF4 and IrF4 being M(III)M(V)F8 compounds. At the same time the existence of Pd(IV) in the compound Pd(II)Pd(IV)F6 indicated the probable existence of PdF4. 

The tetrafluorides of iridium, rhodium and palladium [13] have been established by the work reported in this paper and together with Ptp4 constitute a structurally related set. 

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