美国罗格斯大学纽瓦克分校Frieder Jäkle团队报道了具有多种氧化还原态的电致变色聚阳离子有机硼大环化合物。相关研究成果发表在2021年6月10日出版的《德国应用化学》。

聚阳离子大环化合物因其氧化还原性能而显示出独特的分子开关能力，因而具有很大的吸引力。尽管已经开发出了各种各样的聚阳离子大环化合物，但是基于阳离子硼体系的大环化合物仍然非常有限。

该文介绍了通过将有机硼部分引入共轭有机硼大环骨架来开发新型多阳离子大环的策略。这些大环由四个联吡啶硼单元组成，这些单元由芴和缺电子芳基硼烷或富电子芳胺部分连接。电化学研究表明，大环化合物经历了可逆的多步氧化还原过程，最多转移10个电子。通过光谱电化学研究证明了可切换的电致变色行为，并通过计算电子跃迁DFT方法证明观察到的颜色变化是合理的。

附：英文原文

Title: Electrochromic polycationic organoboronium macrocycles with multiple redox states

Author: Daisuke Shimoyama, Nurcan Baser-Kirazli, Roger A Lalancette, Frieder J

Issue&Volume: 2021-06-10

Abstract: Polycationic macrocycles are attractive as they display unique molecular switching capabilities arising from their redox properties. Although diverse polycationic macrocycles have been developed, those based on cationic boron system remain very limited. We present herein the development of novel polycationic macrocycles by introducing organoboronium moieties into a conjugated organoboron macrocyclic framework. These macrocycles consist of four bipyridylboronium units that are connected by fluorene and either electron-deficient arylborane or electron-rich arylamine moieties. Electrochemical studies reveal that the macrocycles undergo reversible multi-step redox processes with transfer of up to 10 electrons. Switchable electrochromic behavior is demonstrated via spectroelectrochemical studies and the observed color changes are rationalized by correlation with computed electronic transitions using DFT methods.

DOI: 10.1002/anie.202105852

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202105852