Increased Halide Recognition Strength by Enhanced Intercomponent Preorganisation in Triazolium Containing [2]Rotaxanes
作者:Nicholas G. White、Paulo J. Costa、Sílvia Carvalho、Vítor Félix、Paul D. Beer
DOI:10.1002/chem.201303122
日期:2013.12.23
triazolium‐based [2]rotaxanes containing different sized axle and macrocycle components were synthesised in good yields (40–57 %) through chloride anion templation. The anion recognition properties of the interlocked receptor systems were investigated using 1H NMR titration experiments: all three rotaxanes display impressive selectivities for halide anions over the more basic oxoanion acetate. The rotaxanes incorporating
通过氯离子模板,以良好的收率(40–57%)合成了三种基于三唑鎓的[2]轮烷,其中轮轴和大环组分的大小不同。使用1研究了互锁受体系统的阴离子识别特性1 H NMR滴定实验:所有三个轮烷均比碱性更强的氧代阴离子显示出令人印象深刻的卤离子选择性。带有较短,更刚性的带有芳基取代的三唑鎓基团的轮轴烷烃比具有更长的双烷基取代的杂环烷烃显示出更高的阴离子结合亲和力,这归因于较小的轮轴组分提供了更高的组分间预组织。由无约束和伞状采样模拟组成的计算DFT和分子动力学模拟证实了实验观察结果。
Halotriazolium Axle Functionalised [2]Rotaxanes for Anion Recognition: Investigating the Effects of Halogen-Bond Donor and Preorganisation
作者:James M. Mercurio、Richard C. Knighton、James Cookson、Paul D. Beer
DOI:10.1002/chem.201403317
日期:2014.9.8
The anion‐templated synthesis of three novel halogen‐bonding 5‐halo‐1,2,3‐triazolium axle containing [2]rotaxanes is described, and the effects of altering the nature of the halogen‐bond donor atom together with the degree of inter‐component preorganisation on the anion‐recognitionproperties of the interlocked host investigated. The ability of the bromotriazolium motif to direct the halide‐anion‐templated
描述了三种包含[2]轮烷的新型卤素键合5-卤代1,2,3-三唑鎓轴的阴离子模板合成,以及改变卤素键供体原子的性质以及其程度的影响。互锁主体的阴离子识别特性之间的成分间预组织。最初研究了溴三唑鎓基序引导互穿的[2]假轮烷的卤化物-阴离子模板组装的能力。发现溴化物是最有效的模板。结果,使用溴化物阴离子模板法合成了第一个含[2]轮烷的溴三唑鎓车轴,其阴离子结合特性由1确定。1 H NMR光谱滴定实验表明,与氢键质子三唑鎓轮烷类似物相比,溴化物和碘化物的识别性增强。还合成了两个结合有溴和碘代三唑鎓基团的卤素键合[2]轮烷,它们设计成可缩短部件间的预组织,从而缩短了轴的长度。阴离子1 H NMR光谱滴定实验表明,这些轮烷能够与卤化物阴离子更牢固地结合,而碘三唑鎓车轴集成的轮烷能够识别水性溶剂介质中的卤化物。重要的是,这些观察结果表明,与卤素键联的宿主结合域与增强的组分间预组织相结合是有效的阴离子受体必不可少的设计特征。
A rotaxane host system containing integrated triazole C–H hydrogen bond donors for anion recognition
作者:Nicholas G. White、Paul D. Beer
DOI:10.1039/c2ob27229f
日期:——
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 1â:â1 CDCl3âCD3OD 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.
Halide selective anion recognition by an amide-triazolium axle containing [2]rotaxane
作者:Nicholas G. White、Ana R. Colaço、Igor Marques、Vítor Félix、Paul D. Beer
DOI:10.1039/c4ob00801d
日期:——
A new rotaxane containing the 3-amido-phenyl-triazolium group incorporated into the interlocked structure's axle component has been prepared by a chloride anion templated clipping strategy. Proton NMR titration experiments reveal that the interlocked host displays a high degree of halide anion recognition in competitive 1 : 1 CDCl3–CD3OD solvent mixture. Chloride and bromide anions are bound strongly