Supramolecular Self-Assembly of Organic Topological Structures from Charge-Transfer Cocrystal Alloys to Triblock Microrods

The organic charge-transfer (CT) cocrystal alloys integrating the charming CT feature and the unique structure-property of alloys have attracted intensive attention in organic semiconductors. Finely modulating the CT interaction is critical in rationally designing the desired organic cocrystal alloys with novel topological configurations. Herein, we purposely selected 7,12-dimethylbenz[<i>a</i>]anthracene (DBA) and 9,10-dicyanoanthracene (DCA) to coassemble and ensured the formation of organic cocrystal alloys rather than pure cocrystals via tuning the CT interaction between them. Owing to the CT characteristics between DCA and DBA, the prepared cocrystal alloy microrods present red emission, in contrast with the green-emissive DCA microrods and the blue-emissive DBA microplates. Furthermore, the prepared cocrystal alloy demonstrates perfect lattice matching with the DCA crystal, which is conducive to forming their triblock microrods through an epitaxial-growth process for advanced optoelectronics, such as spatially resolved photonic barcodes. This work provides further insights into cocrystal alloys and their topological heterostructures.