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Three pseudo-polymorphs of N, N′-bis(4-nitrophenyl)-2,6-pyridinedicarboxamide 1 were characterized by X-ray crystallography. The C–H ⋅s O hydrogen bond was found to contribute significantly to the assembly of this host. With the variation of the guest, the host changed the molecular conformation and the supramolecular synthons. In all three cases concerned, the solvent guests were bonded through direct...
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