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When encapsulated as a guest in the cavity of the tetrahedral cluster Na12Ga4L6, the phosphonium cation Me2C (OH) PEt3+ (1), normally unstable in aqueous solution (see equilibrium (1) ), can be observed in water. The host–guest complex Na12Ga4L6⊂1 has been observed by 1H and 31P1H NMR spectroscopy as well as by mass spectrometry. This is a rare example of a self-assembled supramolecular cluster stabilizing a reactive species by encapsulation. L=multidentate ligand.
Ziegler et al. (Fri,) studied this question.