A novel heteropolytungstate salt [(CH3)4N]6[H3BiW18O60] is prepared and its crystal structure is determined : monoclinic, P21/c, a=13.986(7) Å, b=15,134(2), c=23.250(8), β=115.32(3)°, Z=2. The anion has the same framework as that found in 18-tungstoarsenate(III)(AsW18O60). The Bi atom is coordinated by three O atoms and is on the apex of BiO3 trigonal pyramid.
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Ozawa et al. (1987) studied this question.
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