Solvent-Dependent Self-Assembly of a Pillar[5]arene-Based Poly-Pseudo-Rotaxane Linked and Threaded by Silver(I) Trifluoroacetate: A Double Role

• Published in: Inorganic chemistry Vol. 62; no. 5; pp. 2058 - 2064
• Main Authors: Kim, Seulgi, Park, In-Hyeok, Ju, Huiyeong, Lee, Yelim, Kim, Joon Rae, Jung, Jong Hwa, Lee, Shim Sung, Lee, Eunji
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 06.02.2023
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/acs.inorgchem.2c03678

In the supramolecule area, the fabrication of a new concept called polyrotaxanes or poly-pseudo-rotaxanes remains challenging. We herein report the formation of a poly-pseudo-rotaxane in which the same salt-type guest serves both linking and threading in the resulting structure. The combination of A1/A2-thiopyridyl pillar[5]­arene (L) and silver­(I) trifluoroacetate in CHCl3/CH3OH afforded a one-dimensional (1D) poly-pseudo-rotaxane. In this structure, to our surprise, the AgCF3CO2 guest not only links the di-armed L ligands via an infinite −L–Ag–L–Ag– arrangement but also threads into a pillar[5]­arene cavity in a dimer form, (AgCF3CO2)2. In contrast, the same reaction in CH2Cl2/CH3OH yielded a simple 1D coordination polymer because an included CH2Cl2 molecule in the pillar[5]­arene cavity prevents the threading of the silver­(I) trifluoroacetate guest. Comparative 1H- and 19F-NMR studies support the solvent-dependent poly-pseudo-rotaxane formation at a lower concentration of L.