Abstract
The bigger the better? Rigidity is more important than size for the construction of permanent porous crystals from organic cage compounds. Two [2+3] cage compounds have been synthesized by an imine condensation reaction. The one consisting of rigid subunits (figure left) has an accessible BET surface area of 744 m2 g−1, whereas the cage compound with flexible subunits is basically nonporous (BET surface area: 30 m2 g−1) although the shape-persistent cavity is larger (9.8 vs. 7.8 Å).
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