visible-light-induced dynamic wagging movement of which enables the photoregulated threading of the macrocycle. This allows reversible in situ de-/reforming of the mechanicalbond without involving dynamic chemical linkage. The DMB-cross-linked polymeric gel shows interesting photoinduced degradation behavior upon visiblelight irradiation. Benefiting from the distinctive dual dynamic nature of reversible bonding behavior
DNA Chimeras as Electrochemical Biosensors for Host‐Guest Measurements in Blood
作者:Élodie V. d'Astous、Philippe Dauphin‐Ducharme
DOI:10.1002/chem.202302780
日期:2023.12.14
Sensing in real blood: We developed a new class of sensors by covalently modifying an electrode-bound DNA with cyclobis-p-phenylene (i. e., blue box), an electroactive host molecule that binds to small electron-richaromatic molecules. Our sensors are rapid (<5 min), single-step, reagentless, and afford continuous and stable measurements (>3 days) of guest molecules at physiologically relevant concentrations
真实血液中的传感:我们通过用环双-对-亚苯基(即蓝框)共价修饰电极结合的 DNA 来开发一类新型传感器,环双-对亚苯基是一种与富含电子的芳香族小分子结合的电活性主体分子。我们的传感器可直接在未稀释的牛全血中快速(<5 id=7>3 天)检测生理相关浓度的客体分子。
Self-Assembly of Novel [2]Catenanes and [2]Pseudorotaxanes Incorporating Thiacrown Ethers or Their Acyclic Analogues
作者:Masumi Asakawa、Peter R. Ashton、Wim Dehaen、Gerrit L'abbé、Stephan Menzer、Jan Nouwen、Françisco M. Raymo、J. Fraser Stoddart、Malcolm S. Tolley、Suzanne Toppet、Andrew J. P. White、David J. Williams
DOI:10.1002/chem.19970030518
日期:1997.5
AbstractA series of π electron rich macrocyclic polythioethers and their acyclic analogues have been synthesized in good yields. The association constants for the complexation of the π electron deficient bis(hexafluorophosphate) bipyridinium‐based salt, paraquat, by these macrocycles, as well as those for the complexation of corresponding acyclic compounds by the bipyridinium‐based tetracationic cyclophane, cyclobis(paraquat‐p‐phenylene), are significantly lower than those observed in the case of the “all‐oxygen” analogues. Nonetheless, yields as high as 86% were recorded in the template‐directed syntheses of [2]catenanes composed of cyclobis(paraquat‐p‐phenylene) and the macrocyclic polythioethers. Single‐crystal X‐ray crystallographic analyses of the [2]catenanes incorporating constitutionally unsymmetrical π electron rich macrocyclic polythioethers revealed that, in all cases, the dioxyaromatic units are located inside the cavity of the tetracationic cyclophane component in preference to the dithiaaromatic units. A similar selectivity was observed in solution by variable‐temperature 1H NMR spectroscopy. However, inversion of the ratio between the two translational isomers of the two [2]catenanes bearing 1,5‐dithi‐anaphthalene, as one of their π electron rich ring systems, and either 1,4‐dioxy‐benzene or 1,5‐dioxynaphthalene, as the other, occurs upon increasing the temperature from –30 to +30 πC. These [2]catenanes can be viewed as temperature‐responsive molecular switches.