期刊
CCS CHEMISTRY
卷 4, 期 1, 页码 318-330出版社
CHINESE CHEMICAL SOC
DOI: 10.31635/ccschem.021.202100870
关键词
supramolecular chemistry; macrocyclic arene; pagoda[5]arene; host-guest complexation; ICT interaction; vapochromic property
资金
- National Natural Science Foundation of China [22031010, 21772205, 21521002, 91856117]
Pagoda[5]arene (P5), composed of five 2,6-dimethoxylanthracene (2,6-DMA) subunits, was synthesized conveniently and showed a symmetrical pentagonal structure with a large and deep electron-rich cavity. It demonstrated stable 1:2 host-guest complexes with various aryl-pyridinium, bipyridinium, and stilbazolium salts in solution. The complexes formed by P5 and protonated pyridinium or bipyridinium salts exhibited acid/base-responsive color changes and remarkable crystalline vapochromic properties.
Pagoda[5]arene (P5), which is composed of five 2,6-dimethoxylanthracene (2,6-DMA) subunits bridged by methylene groups at 1,5 positions, was conveniently synthesized in 43% by trifluoroacetic acid (TFA)-catalyzed one-pot condensation of commercially available 2,6-DMA and paraformaldehyde in 1,2-dichlorobenzene (o-DCB) at room temperature. P5 showed a highly symmetrical pentagonal structure with a large and deep electron-rich cavity, which made it form stable 1:2 host-guest complexes with various aryl-pyridinium, bipyridinium, and stilbazolium salts in solution. Interestingly, P5 could complex two or even three guests with its intrinsic cavity and the pseudo-cavity formed by the adjacent macrocycles in solid states. Moreover, the strong intermolecular charge-transfer (ICT) interactions between P5 and the guests were observed. Especially, the complexes formed by P5 and the protonated pyridinium or bipyridinium salts showed acid/base-responsive color changes in solution and remarkable crystalline vapochromic properties by two kinds of processes: from ICT to no ICT and from ICT to enhanced ICT interaction or vice versa. We believe that the easily available P5 with the specific structure and intriguing 1:2 host-guest complexation can find wide application in supramolecular assemblies and functional materials.
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