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首页> 外文期刊>Journal of Materials Chemistry, A. Materials for energy and sustainability >Multifunctional redox-tuned viologen-based covalent organic polymers
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Multifunctional redox-tuned viologen-based covalent organic polymers

机译：多功能氧化还原调谐的基于紫精的共价有机聚合物

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摘要

The immobilization of molecular switches within materials can give rise to new bulk properties that are useful for a variety of applications. Here, we report the synthesis and characterization of covalent organic polymers composed of cyclotriphosphazene core moieties linked together by redox-switchable viologen units. The polymers are isolated as non-porous, micro-and nano-sized spherical particles whose constituent viologens allow access to three distinct redox states: dicationic, radical-cationic and neutral. With viologens in their dicationic state, the particles were used for magic printing, gaseous ammonia sensing, and efficient oxoanion capture. With viologens in any oxidation state, the polymers were capable of capturing 200 to 380% of their weight of iodine vapor. Iodine capture within all of the viologen-based polymers was fast, requiring minutes, as compared to capture by previously reported polymers, which requires hours. With viologens in their neutral state, the polymers exhibited the highest iodine loadings reported to date. Upon one and two-electron reduction, the polymers partially or completely lost their cationic character and, concomitantly, their anion removal capability.
机译：将分子开关固定在材料中会产生新的整体性质，可用于多种应用。在这里，我们报告的合成和表征共价有机聚合物组成的环三磷腈核心部分通过氧化还原转换紫精单元连接在一起。聚合物被分离为无孔的，微米级和纳米级的球形颗粒，其组成紫精可以进入三种不同的氧化还原状态：双键，自由基-阳离子和中性。紫罗兰以其纯金属状态被用于魔术印刷，气态氨感测和有效的氧阴离子捕获。在紫罗兰素处于任何氧化态的情况下，聚合物都能捕获其重量的200％至380％的碘蒸气。与之前报道的聚合物需要数小时的捕获相比，在所有基于紫精的聚合物中碘的捕获速度很快，需要几分钟。紫罗兰素处于中性状态时，聚合物显示出迄今为止报道的最高碘含量。在一次和两次电子还原时，聚合物部分或完全失去其阳离子特性，并因此失去其阴离子去除能力。

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