title: Revisiting the formation and tunable dissociation of a [2]pseudorotaxane formed by slippage approach.
abstract: A new [2]pseudorotaxane DB24C8⊃1-H · PF6 with dibenzo[24]crown-8 (DB24C8) crown ether-dibenzylammonium (1-H · PF6) binding which was formed by slippage approach at different solvents and temperature, had been isolated and characterized by NMR spectroscopy and mass spectrometry. The [2]pseudorotaxane DB24C8⊃1-H · PF6 was stable at room temperature. The dissociation rate of [2]pseudorotaxane DB24C8⊃1-H · PF6 could be tuned by using different stimuli such as triethylamine (TEA)/diisopropylethylamine (DIPEA) and dimethyl sulfoxide (DMSO). In particular, the dissociation of [2]pseudorotaxane DB24C8⊃1-H · PF6 by an excess of TEA/DIPEA base mixture possessed a long and sustained, complete dissociation over 60 days. Other stimuli by DMSO possessed a relatively fast dissociation over 24 h.
authors: Department of Chemistry and Institute of Creativity, The Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong, China. cfleung@hkbu.edu.hk.|Institute of Molecular Functional Materials, University Grants Committee, Hong Kong, China. cfleung@hkbu.edu.hk.
authors: Ken Cham-Fai
authors: KC
authors: Leung
authors: Department of Chemistry, The Chinese University of Hong Kong, Shatin, NT, Hong Kong, China. terrylau1036@gmail.com.
authors: Kwun-Ngai
authors: KN
authors: Lau
authors: Department of Chemistry, The Chinese University of Hong Kong, Shatin, NT, Hong Kong, China. Wingwong.wwy@gmail.com.
authors: Wing-Yan
authors: WY
authors: Wong
mesh_terms: D004121:Dimethyl Sulfoxide / Q000737:chemistry; D005021:Ethylamines / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D013058:Mass Spectrometry / Q000379:methods; D043862:Rotaxanes / Q000737:chemistry*; D012997:Solvents / Q000737:chemistry; D013696:Temperature
chemical_list: D005021:Ethylamines; D043862:Rotaxanes; D012997:Solvents; C027070:N,N-diisopropylethylamine; D004121:Dimethyl Sulfoxide