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.
Contrasting anion recognition behaviour exhibited by halogen and hydrogen bonding rotaxane hosts
作者:Stuart P. Cornes、Charles H. Davies、David Blyghton、Mark R. Sambrook、Paul D. Beer
DOI:10.1039/c4ob02547d
日期:——
A [2]rotaxane anion host that switches selectivity from dihydrogen phosphate to the halides upon substituting a hydrogen bond donor group for a halogen bond donor group within the axle component is described.
Clipping and stoppering anion templated synthesis of a [2]rotaxane host system
作者:Yitong Li、Kathleen M. Mullen、João Sardinha、Vítor Félix、Paul D. Beer
DOI:10.1039/c1dt10887e
日期:——
A new [2]rotaxane host system containing nitro-isophthalamide macrocycle and polyether functionalised pyridinium axle components is prepared via clipping and stoppering synthetic methodologies using chloride anion templation. After removing the chloride anion template, 1H NMR titration experiments reveal the unique interlocked host cavity to be highly selective for binding chloride and bromide in preference to basic oxoanions in competitive aqueous solvent mixtures. The rotaxane host system proved to be a superior anion complexant in comparison to the individual macrocycle and axle components. The anion binding affinity of the novel rotaxane is also investigated via molecular dynamics simulations and in general the structural data obtained corroborates the experimental solution anion recognition behaviour.
Porphyrin-functionalised rotaxanes for anion recognition
作者:Asha Brown、Paul D. Beer
DOI:10.1039/c1dt11372k
日期:——
anion-recognition properties of two new porphyrin-functionalised [2]rotaxane host molecules are described. The rotaxane compounds are prepared via a chloride-anion-templated clipping strategy. 1H NMR titration experiments demonstrate that the rotaxane host systems exhibit high binding affinities and general selectivities for chloride anions in DMSO-d6 or CDCl3/CD3OD solvent systems. UV-visible and fluorescence
描述了两个新的卟啉官能化的[2]轮烷主体分子的合成和阴离子识别特性。轮烷化合物是通过以下方法制备的:氯阴离子模板的裁剪策略。1 H NMR滴定实验表明,轮烷的主体系统具有很高的结合亲和力和对氯化物 负离子 DMSO- d 6 或者 CDCl 3/CD 3 OD溶剂系统。紫外可见和荧光光谱实验表明,轮烷受体不能用作光学阴离子传感器。然而,两种受体均被证明能够检测氯化物阴离子通过卟啉P /的阴极位移进行电化学P + 氧化还原夫妇。
Anion recognition by halogen bonding and hydrogen bonding bis(triazole)-imidazolium [2]rotaxanes
作者:Grace Turner、Andrew Docker、Paul D. Beer
DOI:10.1039/d1dt02414k
日期:——
A novel halogen bonding (XB) bis(iodotriazole)-imidazolium motif is incorporated into the axle component of a [2]rotaxane via a discrete chloride aniontemplate directed clipping methodology. 1H NMR anion titration experiments reveal the interlocked host is capable of strong halide and sulfate oxoanion binding in competitive aqueous–organic CDCl3/CD3OD/D2O (45 : 45 : 10 v/v) solvent mixtures. In comparison
通过离散的氯阴离子模板定向剪切方法,将新型卤素键 (XB) 双(碘三唑)-咪唑基团并入 [2] 轮烷的轴组件中。1 H NMR 阴离子滴定实验表明,互锁主体能够在竞争性水性有机 CDCl 3 /CD 3 OD/D 2 O (45 : 45 : 10 v/v) 溶剂混合物中与卤化物和硫酸盐氧阴离子强结合。与氢键轮烷类似物相比,在 Cl -、I -和 SO 4 2-之间没有明显的选择性,XB 轮烷的轴碘-三唑供体基序调节对较轻卤化物 Cl - ≈ Br - > SO 4 2- > I -的阴离子识别偏好。