CB[8]-based rotaxane as a useful platform for sensitive detection and discrimination of explosives
作者:Wei Zhu、Weina Li、Chen Wang、Jiecheng Cui、Haowei Yang、Yin Jiang、Guangtao Li
DOI:10.1039/c3sc51132d
日期:——
Based on a naphthalene-threaded cucurbit[8]uril (CB[8]) rotaxane structure on a solid substrate, a new strategy for rapid, fully reversible, and highly sensitive detection of a broad class of explosives was developed by using one receptor. Due to the unique confinement effect and size exclusion of the CB[8] cavity, it is found that the intercalation of an explosive compound in the constructed rotaxane can significantly influence the photophysical property of the naphthalene core in the confined nanocavity of CB[8]. Dependent on the electronic structures and the sizes of explosive compounds, the fluorescence of the naphthalene core would be quenched or enhanced to different extents, leading to the direct detection and discrimination of distinctively different groups of trace explosives in the vapor phase, especially including the challenging aliphatic nitro-organics (RDX, HMX and PETN). Control experiments were performed to show the different sensing behaviors between the common organic vapors and nitrate-based explosives, which made it easy to realize the discrimination between target analytes and interferents. Due to the surface-attached sensing elements, a rapid response was also achieved in this system. Moreover, the non-covalent nature of the resulting heteroternary complex indicates that the trapped target molecules in the rotaxane structure are facilely removable by simply washing, demonstrating an excellent regeneration of the constructed explosive sensors for real-world application. The performed experiments suggested that the rotaxane structure-based sensing protocol opened a new way to develop a new kind of explosive sensors enabling a richer identification of threats.
Orthogonal switching of self-sorting processes in a stimuli-responsive library of cucurbit[8]uril complexes
作者:Stefan Schoder、Christoph A. Schalley
DOI:10.1039/c7cc05469f
日期:——
The self-sorting processes in dynamic libraries of cucurbit[8]uril complexes can be switched orthogonally by pH and redox stimuli.
瓜[8]葫芦复合物动态库中的自排序过程可以通过pH和氧化还原刺激进行正交切换。
Ion-controlled switchable complexation between pentiptycene-based tweezer-like hosts and self-folding guests
作者:Ying Han、Jia-Bin Guo、Jing Cao、Chuan-Feng Chen
DOI:10.1016/j.tet.2013.04.030
日期:2013.6
A couple of self-folding A-D-A guests were synthesized, and it was found that the guests could be included by the pentiptycene-based tweezer-like hosts to form stable 1:1 complexes in solution, which have been evidenced by the 1H NMR, ROESY 2D NMR and ESI MS spectra. Moreover, a potassium ion-controlled switchable process between the host and the self-folding guest was further achieved.
合成了一些自折叠的ADA客体,发现客体可以被基于五萜烯的镊子样主体所包含,从而在溶液中形成稳定的1:1络合物,这已经通过1 H NMR进行了证明, ROESY 2D NMR和ESI MS光谱。而且,进一步实现了宿主和自折叠客体之间钾离子控制的可切换过程。