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首页> 外文期刊>Chemistry: A European journal >Host-guest-driven copolymerization of tetraphosphonate cavitands
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Host-guest-driven copolymerization of tetraphosphonate cavitands

机译：主客体驱动的四膦酸酯空泡体的共聚

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摘要

The outstanding complexing properties of tetraphosphonate cavitands towards N-methylpyridinium salts were exploited to realise a new class of linear and cyclic AABB supramolecular polymers through host-guest interactions. The effectiveness of the selected self-association processes was tested by 1HNMR studies, whereas microcalorimetric analyses clarified the binding thermodynamics and revealed the possibility of tuning entropic contributions by acting on the flexibility of the guest linker. Although the formation of linear polymeric chains for a rigid system was demonstrated by X-ray analysis, the presence of a concentration-dependent ring-chain equilibrium was indicated by solution viscosity measurements in the case of a very flexible ditopic BB guest co-monomer. Supramolecular alternating copolymers: Cyclic and linear AABB supramolecular copolymers were prepared by connecting complementary monomeric units through host-guest interactions. Thermodynamic and topological control of this process was achieved by controlling the flexibility of the ditopic guest spacer, solvent and concentration. The structure of the alternating copolymer formed by self-assembly of a bis(tetraphosphonate cavitand) and methyl viologen is shown.
机译：利用四膦酸盐空洞分子与N-甲基吡啶鎓盐的出色络合特性，通过宿主-客体相互作用实现了一类新型的线性和环状AABB超分子聚合物。所选自缔合过程的有效性通过1HNMR研究进行了测试，而微量热分析则阐明了结合热力学，并揭示了通过影响客体连接子的柔性来调节熵贡献的可能性。尽管通过X射线分析证实了用于刚性系统的线性聚合物链的形成，但是在非常灵活的二位BB客体共聚单体的情况下，溶液粘度测量表明存在浓度依赖性的环链平衡。超分子交替共聚物：环状和线性AABB超分子共聚物是通过主体-客体相互作用连接互补单体单元而制备的。该过程的热力学和拓扑控制是通过控制对位客体间隔物的柔性，溶剂和浓度来实现的。示出了通过双（四膦酸酯cavitand）和甲基紫精的自组装形成的交替共聚物的结构。

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