The novel protonated hexasodium dihydrogen hexatungstoplatinate(IV) doicosahydrate, Na6[H2PtW6O24]·22H2O, was crystallized in the triclinic system in space group P 1. The [H2PtW6O24]6− polyanion has Ci ( 1) symmetry. The identification of the protonated O atom in the polyanion is difficult because it does not form interpolyanion hydrogen bonds, and a clear difference was not found in the W—O(H) bond lengths or the W—O(H)—W bond angles to indicate protonation of the O atom.
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Lee et al. (2004) studied this question.
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