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Solution\u2010 and solid\u2010state <jats:sup>31<\/jats:sup>P and <jats:sup>77<\/jats:sup>Se NMR spectroscopy revealed significant differences between the NMR parameters in solution and in the solid state, related to conformational changes in the molecules. Many compounds were shown to exhibit a number of different polymorphic structures (identified by single\u2010crystal XRD), although the bulk material studied by solid\u2010state NMR spectroscopy often contained just one major polymorph. 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