The addition of iodate or orthoperiodate ions to red perchlorate solutions of iridium(IV) gives an insoluble blue precipitate of stoicheiometry IrIO8H7, which can be dehydrated to IrlO6H3. A structure, is suggested which involves an iodato-bridge, IO3(OH)3, between two iridium atoms.
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Rose et al. (1969) studied this question.