Anions get wheely big: A Cu20-containing polyoxotungstate of large size and high symmetry was synthesized by making use of the template effect. The wheel-shaped [Cu20Cl(OH)24(H2O)12(P8W48O184)]25− ion (see picture; black W, turquoise Cu, yellow P, violet Cl, red O) is the first transition-metal-substituted derivative of [H7P8W48O184]33− and incorporates more paramagnetic 3d metal ions than any other polyoxotungstate to date.
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Mal et al. (2005) studied this question.
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