Abstract
It begins with a single InS4 tetrahedron (blue), then, in the hierarchical structure of the [Cd16In64S134]44− ion, comes a supertetrahedron of these tetrahedra, a supertetrahedron of supertetrahedra (a super‐supertetrahedron, extra Cd atoms in white), and finally a supertetrahedron of super‐supertetrahedra. The yellow sphere marks a huge cavity and the Sierpinski tetrahedron the next level of the hierarchy. For more details see the Communication by O. M. Yaghi et al. on page 1819 ff.
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