The salts (K-2,2,2-crypt)2Sn4·en (en = ethyl-enediamine) and (Na-2,2,2-crypt)2Ge4 have been synthesized and shown by single crystal X-ray diffraction to contain the 18-electron, tetrahedral cluster anions Sn42– and Ge42–.
S. C. Critchlow and J. D. Corbett, J. Chem. Soc., Chem. Commun., 1981, 236 DOI: 10.1039/C39810000236
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