Fig. 15 Formation of supramolecular cross-linked networks from the homoditopic B21C7 host
and secondary ammonium salt-functionalized polymer
Fig. 16 Schematic representation of main-chain poly[n]rotaxanes, poly[c2]daisy chains and hierarchical construction of poly[2]rotaxanes
2 Polypseudorotaxanes Constructed by Crown Ethers
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