A rotaxane host system containing integrated triazole C-H hydrogen bond donors for anion recognition

作者：White Nicholas G; Beer Paul D^*

来源：Organic and Biomolecular Chemistry, 2013, 11(8): 1326-1333.

DOI：10.1039/c2ob27229f

Two rotaxanes incorporating a 3,5-bis(triazole)-pyridinium axle component have been prepared using either an anion templated amide condensation or ring closing metathesis (RCM) clipping strategy. The respective yields of interlocked receptor were found to be significantly higher when the RCM clipping synthetic route was used. Proton NMR titration experiments in competitive 1:1 CDCl3-CD3OD solvent media reveal that the rotaxane prepared by the clipping procedure is selective for halide anions over larger, more basic oxoanions. Interestingly, the interlocked host displays an unusual preference for bromide over other halide anions.

• 出版日期2013