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Acid/base controllable molecular recognition

机译:酸/碱可控分子识别

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The study of controllable molecular recognition in supramolecular receptors is important for elucidating design strategies that can lead to external control of molecular recognition applications. In this work, we present the design and synthesis of an asymmetric (TTF) tetrathiafulvalene-calix[4]pyrrole receptor and show that its recognition of 1,3,5-trinitrobenzene (TNB) can be controlled by an acid/base input. The new receptor is composed of three identical TTF units and a fourth TTF unit appended with a phenol moiety. Investigation of the host-guest complexation taking place between the TTF-calix[4]pyrrole receptor and the TNB guests was studied by means of absorption and ~1H NMR spectroscopy; this revealed that the conformation of the molecular receptor can be switched between locked and unlocked states by using base and acid as the input. In the unlocked state, the receptor is able to accommodate two TNB guest molecules, whereas the guests are not able to bind to the receptor in the locked state. This work serves to illustrate how external control (acid/base) of a receptor may be used to direct the molecular recognition of guests (TNBs). It has led to a new controllable molecular recognition system that functions as an acid/base switch.
机译:对超分子受体中可控分子识别的研究对于阐明可导致分子识别应用外部控制的设计策略非常重要。在这项工作中,我们目前的设计和合成的不对称(TTF)四硫富瓦烯-杯[4]吡咯受体,并表明其对1,3,5-三硝基苯(TNB)的识别可以通过酸/碱输入来控制。新的受体由三个相同的TTF单元和一个附加有酚部分的第四TTF单元组成。通过吸收和〜1H NMR光谱研究了TTF-杯[4]吡咯受体和TNB客体之间发生的客体-客体络合。这表明通过使用碱和酸作为输入,可以在锁定状态和解锁状态之间切换分子受体的构象。在解锁状态下,受体能够容纳两个TNB客体分子,而客体在锁定状态下无法与受体结合。这项工作旨在说明如何使用受体的外部控制(酸/碱)来指导来宾(TNB)的分子识别。这导致了一个新的可控分子识别系统,该系统可作为酸/碱开关。

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