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The Lewis octets and the 18‐electron principle are well‐known, and are thought to correspond to filling the (s, p)‐like and (s, p, d)‐like shells, respectively, for an MLn complex. The chapter describes the work of Cui et al, where a new class of Zintl ions, plumbaspherene, Pb2‐12, and stannaspherene, Sn2‐12, were characterized by photoelectron spectroscopy as hosts for building up a new type of endohedral...
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