Degenerate [2]rotaxanes with electrostatic barriers
作者:Hao Li、Yan-Li Zhao、Albert C. Fahrenbach、Soo-Young Kim、Walter F. Paxton、J. Fraser Stoddart
DOI:10.1039/c0ob00937g
日期:——
and the CBPQT4+ ring in the [2]rotaxanes. Thus, the CBPQT4+ rings in the degenerate [2]rotaxanes exhibit slow shuttling between two DNP recognition sites on the 1H NMR time-scale on account of the electrostaticbarrier posed by the bispyridinium units, as demonstrated by variable-temperature 1H NMR spectroscopy. Electrochemical experiments carried out on the [2]rotaxanes 1·6PF6 and 2·6PF6 indicate that