Co-assembly-Directed\nEnhancement of the Thermochromic\nReversibility and Solvatochromic Selectivity of Supramolecular Polydiacetylene

The construction of functional materials via the co-assembly\nof\nmultimolecular systems has recently emerged as a fascinating topic.\nThe co-assembled multicomponent could promote the evolution of supramolecular\nassemblies into a high-order nanoarchitecture with improved functional\nproperties. We report the successful preparation of a dual-functional\npolydiacetylene (<b>MCPDA-Tz-CA</b>) having thermochromic and\nsolvatochromic properties via facile co-assembly of <b>MCDA-Tz</b> and cyanuric acid (<b>MCDA-Tz-CA</b>) followed by ultraviolet-induced\npolymerization. Molecular packing patterns from powder X-ray diffraction\nand density functional theory calculations of molecular self-assembly\nprocesses confirm highly ordered co-assembled lamellar structures. <b>MCPDA-Tz-CA</b> showed excellent reversible thermochromism properties\nwhen the temperature was increased from 30 to 150 °C with a reversible\nblue-to-red color transition that could be detected by the naked eye.\nAlso, <b>MCPDA-Tz-CA</b> displayed selective blue-to-red solvatochromism\nagainst dimethylformamide and dimethyl sulfoxide. Detailed investigations\nrevealed that the enhanced thermochromic reversibility and solvatochromic\nselectivity could be attributed to the hydrogen-bonding interactions\nand the formation of a network structure in the <b>MCDA-Tz</b>/cyanuric acid co-assembly. Our research opens a promising route\nfor improving the performance of functional materials via noncovalent\nmulticomponent arrangements at the molecular level.