Iridium(V) fluoride

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Iridium(V) fluoride, IrF5, is a yellow, highly reactive solid that melts at about 104.5 °C. Its chemical formula is IrF5. In the solid state it forms a tetramer, Ir4F20, with each iridium atom surrounded by six fluorine atoms (octahedral coordination). This structure is similar to the fluorides of ruthenium and osmium (RuF5 and OsF5). IrF5 can be prepared by controlled decomposition of IrF6 or by reducing IrF6 with silicon powder or hydrogen in anhydrous HF. Related compounds include RhF5, OsF5, PtF5, as well as IrF4 and IrF6.