Answers are grounded in this paper and cite their sources.
The unique trigonal bipyramidal Pb52– and unicapped antiprismatic Sn94– anions have been discovered by X-ray structural studies on their salts with Na+(2,2,2-crypt).
No takes yet. Share an insight, caveat, or question.
Corbett et al. (1975) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: