Abstract
The host cocrystal 1 with a soft-cavity-type structure unit has been assembled by 1,4-diiodotetrafluorobenzene and 4-phenylpyridine N-oxide (PPNO) molecules mainly using the robust C–I···–O–N+ halogen bond. The results indicate that the host cavity has the capacity to envelope functional guests, Car, Nap, Phe, and BhQ molecules, to further form the host–guest cocrystals 2–5 by halogen bonds, hydrogen bonds, and other weak noncovalent interactions. The supramolecular cavity can be adjusted in size or shape to a certain degree by the bound guest molecule, reflecting its softness, openness, and inclusiveness. Moreover, compared to the pristine PPNO and guest molecules, the prepared cocrystals 1–5 display tunable luminescence behaviors at room temperature. The present work may pave a new platform for developing host–guest solid materials which have potential applications in the fields of luminescent sensor, light-emitting display, pharmaceutical encapsulation, and separation chemistry.
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