The 119Sn-CPMAS-NMR spectra of the complex [(i-PrSn)12O14(OH6)]2+ ion were recorded for two different salts having twelve and four different tin atoms in the asymmetric unit, respectively. Both spectra agree very well with X-ray crystallographic predictions, and thus demonstrate the great sensitivity of heavy nuclei NMR spectroscopy to subtle structural changes. Infrared spectroscopy is shown to be a suitable routine detection method for the identification of this ion in the solid state.
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Reuter et al. (1993) studied this question.