title: Complexation between pillar[5]arenes and a secondary ammonium salt.
abstract: We demonstrate that n-octylethyl ammonium hexafluorophosphate (G) can thread through the cavity of 1,4-dimethoxypillar[5]arene to form a [2]pseudorotaxane with a binding constant of 1.09 (±0.31) × 10(3) M(-1) in chloroform. The formation of this threaded structure has been confirmed by proton NMR spectroscopy, electrospray ionization mass spectrometry, and X-ray single crystal analysis. The complexation between 1,4-dimethoxypillar[5]arene and G in chloroform can be switched off by adding Cl(-). For comparison, the complexation between 1,4-bis(n-propoxy)pillar[5]arene and G has also been investigated.
authors.affiliation: Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China.
authors.forename: Chengyou
authors.initials: C
authors.lastname: Han
authors.forename: Guocan
authors.initials: G
authors.lastname: Yu
authors.forename: Bo
authors.initials: B
authors.lastname: Zheng
authors.forename: Feihe
authors.initials: F
authors.lastname: Huang