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首页> 外文期刊>Chemistry: A European journal >Tuneable Redox Chemistry and Electrochromism of Persistent Symmetric and Asymmetric Azine Radical Cations
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Tuneable Redox Chemistry and Electrochromism of Persistent Symmetric and Asymmetric Azine Radical Cations

机译：可调调谐氧化还原化学与持续对称和不对称氮杂根阳离子的电致枝条

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摘要

Molecular organic radicals have been intensively studied in the last decades, due to their interesting optical, magnetic and redox properties. Here we report the synthesis and characterisation of persistent organic radicals from oneelectron oxidation of redox-active azines (RAAs), composed of two guanidinyl or related groups. By connecting two different groups together, asymmetric compounds result. In this way a series of compounds with varying redox potential is obtained that could be oxidised reversibly to the monoand the dicationic charge states. The accessible redox states were fully determined by chemical redox reactions. The standard Gibbs free energy change for disproportionation of the radical monocation into the dication and the neutral molecule in solution, estimated from cyclovoltammetric measurements, varies between 43 and 71 kJmol~(-1). While the neutral RAAs absorb predominately UV light, the radical monocations display strong absorptions covering almost the entire visible region and extending for some compounds into the NIR region. A detailed analysis of this highly reversible electrochromism is presented, and the fast switching characteristics are demonstrated in an electrochromic test device.
机译：由于其有趣的光学，磁性和氧化还原性能，在过去的几十年中已经集中研究了分子有机基团。在这里，我们报告了由两种胍基或相关基团组成的氧化还原活性吖啶（RAA）的一种用于一种电子氧化的持久性有机基团的合成和表征。通过将两个不同的组连接在一起，不对称化合物结果。以这种方式，获得了一系列具有不同氧化还原电位的化合物，其可以可逆地氧化成单声道的透明电荷状态。通过化学氧化还原反应充分确定可移的氧化还原状态。标准Gibbs自由基单位歧化的自由能量变化在溶液中的溶液中的溶液中和中性分子，估计在43至71 kJmol〜（-1）之间变化。虽然中性RAA吸收主要的UV光，但是自由基单块显示器覆盖几乎整个可见区域并延伸到NIR区域中的强烈吸收。提出了对这种高可逆电致变色的详细分析，并且在电致变色测试装置中证明了快速切换特性。

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