The α-Keggin ions [TNb12O40]16− (T=Si, Ge) have been synthesized hydrothermally as water-soluble sodium salts. These clusters are very highly charged, and are bound to their charge-balancing sodium atoms in the solid state (see picture). NMR spectroscopy experiments show that the sodium atoms remain strongly associated with the clusters in solution.
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Nyman et al. (2004) studied this question.
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