title: Reversible 2D pseudopolyrotaxanes based on cyclodextrins and cucurbit[6]uril.
abstract: In this paper, a pseudorotaxane (2) was synthesized by reaction of cucurbit [6]uril with 6-[(6-aminohexyl)amino]-6-deoxy-beta-cyclodextrin chloride. Subsequently, pseudorotaxanes 2 were further assembled to form a 2D pseudopolyrotaxane (3) through an alpha,omega-PPG2000 diamino polymer threading the cavities of cyclodextrins in 2, and the resulting pseudopolyrotaxane was comprehensively characterized by FT-IR, NMR, TG-DTA, elemental analysis, and transmission electron microscopy. Significantly, the 2D pseudopolyrotaxane can turn into a main-chain pseudopolyrotaxane in the presence of base, and then the addition of alpha-cyclodextrins may result in a reversible switch between two different 2D pseudopolyrotaxanes.
authors.affiliation: Department of Chemistry, State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, P R China. yuliu@nankai.edu.cn
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
authors.forename: Chen-Feng
authors.initials: CF
authors.lastname: Ke
authors.forename: Heng-Yi
authors.initials: HY
authors.lastname: Zhang
authors.forename: Wei-Jia
authors.initials: WJ
authors.lastname: Wu
authors.forename: Jun
authors.initials: J
authors.lastname: Shi
mesh_terms: D001952:Bridged-Ring Compounds / Q000737:chemistry*; D003505:Cyclodextrins / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D046529:Microscopy, Electron, Transmission; D015394:Molecular Structure; D020442:Poloxamer / Q000737:chemistry*; D043862:Rotaxanes / Q000737:chemistry*; D047028:Macrocyclic Compounds; D000099246:Cucurbit(n)urils
chemical_list: D001952:Bridged-Ring Compounds; D003505:Cyclodextrins; D007093:Imidazoles; D020442:Poloxamer; D043862:Rotaxanes; C475674:pseudopolyrotaxane; C454805:cucurbit(6)uril; D047028:Macrocyclic Compounds; D000099246:Cucurbit(n)urils