Iridium(IV) fluoride

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OtherNames = Iridium tetrafluoride
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CASNo = 37501-24-9
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Formula = IrF₄
MolarMass = 268.2109 g/mol
Appearance = dark brown solid
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Iridium(IV) fluoride is a chemical compound of iridium and fluorine, with the chemical formula IrF₄ and is a dark brown solid.Greenwood&Earnshaw] Early reports of IrF₄ prior to 1965 are questionable and appear to describe the compound IrF₅. The solid can be prepared by reduction of IrF₅ with iridium black or reduction with H₂ in aqueous HF [cite journal | title = Reductive syntheses of transition metal fluoride compounds. Synthesis of rhenium, osmium, and iridium pentafluorides and tetrafluorides | journal = Robert T. Paine, Larned B. Asprey | journal = Inorg. Chem. | volume = 14 | issue = 5 | year = 1975 | pages = 1111 - 1113 | doi = 10.1021/ic50147a030] The crystal structure of the solid is notable as it was the first example of a three dimensional lattice structure found for a metal tetrafluoride and subsequently RhF₄, PdF₄ and PtF₄ have been found to have the same structure. Wells A.F. (1984) "Structural Inorganic Chemistry" 5th edition Oxford Science Publications ISBN 0-19-855370-6 ] The structure has 6 coordinate, octahedral, iridium where two edges of the octahedra are shared and the two unshared fluorine atoms are "cis" to one another.

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