Figure 1: Structure of 1 determined by single-crystal XRD.

(a) Ball and stick representations of the truncated tetrahedral and truncated octahedral cages, the yellow spheres represent the void inside the cages. (b) Polyhedral presentation of a. (c) The 3D polyhedral structure of 1. (d) The (3,4)-connected augmented net (top) as a natural tiling.