Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 15, Pages 8115-8120Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202013701
Keywords
host– guest systems; pillararenes; supramolecular chemistry; supramolecular polymers; vapochromic materials
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Funding
- National Natural Science Foundation of China [22035006]
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The research has discovered different complexation modes of perethylated pillar[5]arene with 1,2,4,5-tetracyanobenzene in various solvents, and successfully fabricated a vapochromic solid-state supramolecular polymer using exo-wall complexation.
The research for the solid-state supramolecular polymers with specific functions accelerates the development of supramolecular and materials sciences. Herein, we discover the different complexation modes of perethylated pillar[5]arene (EtP5) with 1,2,4,5-tetracyanobenzene (TCNB) in various solvents. Driven by charge-transfer interaction, TCNB is enclosed in the cavity of EtP5 in CHCl3, while TCNB complexes with EtP5 at the exo-wall of EtP5 in CH2Cl2. This is because the size of CH2Cl2 matches the cavity of EtP5, forcing TCNB to complex with the exo-wall of EtP5. Furthermore, we fabricate a vapochromic solid-state supramolecular polymer by exploiting the exo-wall complexation, which turns from brown to reddish brown or black after adsorption of alkyl aldehyde vapors. The adsorptive nature for alkyl aldehyde vapors comes from the unoccupied cavity of EtP5 based on C-H...pi interactions. The vapochromic property is attributed to the change of the charge-transfer interaction caused by molecular rearrangement induced by vapor-capture in the solid-state supramolecular polymer.
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