Figure 1
Crystal structure of the Z′ = 56 polymorph of 1,3,5-tris(4-carboxyphenyl)benzene: (a) overhead view of the hexagonal sheets, shifted in respect to each other; (b) π-stacks of hexagonal sheets with thickness of alternating 3 and 4 molecules; (c) 7 molecules fit within the hexagons; (d) eightfold polycatenation; (e) extended view of the eightfold polycatenation of hexagonal layers (reproduced with permission from Zentner et al., 2015, © Royal Society of Chemistry). |