943857-87-2Relevant academic research and scientific papers
Axle component separated ion-pair recognition by a neutral heteroditopic [2]rotaxane
Knighton, Richard C.,Beer, Paul D.
supporting information, p. 1540 - 1542 (2014/02/14)
A neutral heteroditopic pyridine N-oxide axle containing [2]rotaxane, synthesised via sodium cation templation, displays cooperative recognition of alkali metal cation-halide anion ion-pairs in an unprecedented axle component separated ion-pair binding fa
Anion recognition and cation-induced molecular motion in a heteroditopic [2]rotaxane
Leontiev, Alexandre V.,Jemmett, Charlotte A.,Beer, Paul D.
supporting information; scheme or table, p. 816 - 825 (2011/03/19)
A heteroditopic [2]rotaxane consisting of a calix[4]diquinone- isophthalamide macrocycle and 3,5-bis-amide pyridinium axle components with the capability of switching between two positional isomers in response to barium cation recognition is synthesised. The anion binding properties of the rotaxane's interlocked cavity together with Na+, K+, NH4+ and Ba2+ cation recognition capabilities are elucidated by 1H NMR and UV-visible spectroscopic titration experiments. Upon binding of Ba2+, molecular displacement of the axle's positively charged pyridinium group from the rotaxane's macrocyclic cavity occurs, whereas the monovalent cations Na+, K+ and NH4+ are bound without causing significant co-conformational change. The barium cation induced shuttling motion can be reversed on addition of tetrabutylammonium sulfate. Copyright
Anion-templated calix[4]arene-based pseudorotaxanes and catenanes
Lankshear, Michael D.,Evans, Nicholas H.,Bayly, Simon R.,Beer, Paul D.
, p. 3861 - 3870 (2008/02/07)
We present the rational design and anion-binding properties of the first anion-templated pseudorotaxanes and catcnanes in which the "wheel" component is provided by a calix[4|arene macrobicyclic unit. The designs and syntheses of two new calix[4]arene mac
