HexafluoropalladateIV

Hexafluoropalladate(IV) refers to the hexacoordinate palladium(IV) fluoride anion, [PdF6]2−. This octahedral anion forms salts with various counterions, for example potassium hexafluoropalladate(IV), K2PdF6, and thallium(IV) hexafluoropalladate, Tl2PdF6. The palladium center is in oxidation state +4 and is coordinated by six fluoride ligands, yielding an octahedral geometry. In solid salts, [PdF6]2− is embedded within a lattice of counterions, and the compound is studied as part of fluoride coordination chemistry and high-oxidation-state palladium chemistry.

Synthesis and occurrence: Hexafluoropalladate(IV) salts are prepared under strictly anhydrous conditions by fluorinating palladium-containing precursors or by oxidation of palladium(II) fluoride in fluoride-rich media, with the [PdF6]2− unit isolated by metathesis to give salts such as K2PdF6. The chemistry of [PdF6]2− is discussed in solid-state fluoride chemistry and coordination chemistry literature, where its stability and lattice properties are contrasted with other palladium fluoride species.

Properties: These salts are typically colorless to pale crystals and are sensitive to moisture, decomposing in humid conditions. In aqueous solution, [PdF6]2− is not generally stable and hydrolyzes, limiting its use to dry media. The complex is primarily of interest for structural, synthetic, and mechanistic studies of high-oxidation-state palladium and fluoride ligands.

See also: Hexafluoroplatinate(IV); palladium fluoride chemistry; fluoride coordination chemistry.