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Vapochromic Behaviors of A Solid‐State Supramolecular Polymer Based on Exo‐Wall Complexation of Perethylated Pillar[5]arene with 1,2,4,5‐Tetracyanobenzene
Author(s) -
Wang Mengbin,
Li Qing,
Li Errui,
Liu Jiyong,
Zhou Jiong,
Huang Feihe
Publication year - 2021
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202013701
Subject(s) - supramolecular chemistry , pillar , alkyl , supramolecular polymers , polymer , solid state , chemistry , crystallography , polymer chemistry , materials science , organic chemistry , crystal structure , structural engineering , engineering
Abstract 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 CHCl 3 , while TCNB complexes with EtP5 at the exo‐wall of EtP5 in CH 2 Cl 2 . This is because the size of CH 2 Cl 2 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⋅⋅⋅π 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.