Leung Ken Cham-Fai, Lau Kwun-Ngai, Wong Wing-Yan
Department of Chemistry and Institute of Creativity, The Hong Kong Baptist University, Kowloon Tong, Kowloon, Hong Kong, China.
Institute of Molecular Functional Materials, University Grants Committee, Hong Kong, China.
Int J Mol Sci. 2015 Apr 13;16(4):8254-65. doi: 10.3390/ijms16048254.
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.
一种新的[2]准轮烷DB24C8⊃1-H·PF6，其由二苯并[24]冠-8（DB24C8）冠醚与二苄基铵（1-H·PF6）通过滑移法在不同溶剂和温度下形成，已通过核磁共振光谱和质谱进行分离和表征。[2]准轮烷DB24C8⊃1-H·PF6在室温下稳定。[2]准轮烷DB24C8⊃1-H·PF6的解离速率可通过使用不同的刺激因素进行调节，如三乙胺（TEA）/二异丙基乙胺（DIPEA）和二甲基亚砜（DMSO）。特别地，过量的TEA/DIPEA碱混合物使[2]准轮烷DB24C8⊃1-H·PF6解离，其解离过程漫长且持续，在60天内完全解离。DMSO的其他刺激因素使其在24小时内具有相对较快的解离速度。
