Abstract
Abstract The H-bond mediated self-assembly of the chiral C2-symmetric bis-(2-amino-4-chloro-pyrimidines) 3 and 4 allows for the molecular recognition directed generation of helical superstructures. In the former case, unoccupied channel structures defined by the cylindrical interior of the derived supramolecular helix result, as revealed by X-ray crystallographic analysis using a synchrotron source. Upon crystallization, racemic 3 spontaneously resolves to form homochiral crystals exhibiting a helical packing motif identical to that determined for optically pure 3. The data provide insight into the interplay of the different structural and interactional features of the molecular components to the generation of the channel structure and suggest design strategies toward porous organic molecular solids of variable size.
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