Optimizing Electron Transfer Mediators Based on Arylimidazoles by Ring Fusion: Synthesis, Electrochemistry, and Computational Analysis of 2-Aryl-1-methylphenanthro[9,10-<i>d</i>]imidazoles
作者:Robert Francke、R. Daniel Little
DOI:10.1021/ja410865z
日期:2014.1.8
phenanthro[9,10-d]imidazoles but also to improved stability of the corresponding radical cation. These concepts were verified with eight new phenanthro[9,10-d]imidazole derivatives, using cyclic voltammetry and DFT calculations. For this purpose, an optimized and general synthetic route to the desired compounds was developed. An excellent linear correlation of the calculated effective ionization potentials with
通过简单的结构修饰可以显着改善基于三芳基咪唑骨架的氧化还原催化剂的性能。通过连接位于 C-4 和 C-5 的芳烃的邻碳,生成稠合骨架,消除平面性的扭曲并增强取代基对氧化还原性能的影响。这种修饰不仅导致所得菲[9,10-d]咪唑的可用氧化还原电位范围更广,而且还提高了相应自由基阳离子的稳定性。使用循环伏安法和 DFT 计算,用八种新的菲 [9,10-d] 咪唑衍生物验证了这些概念。为此,开发了一种优化的通用合成路线,以获得所需的化合物。获得了计算出的有效电离电位与实验氧化电位的极好线性相关性,允许准确预测尚未合成的衍生物的氧化电位。此外,发现电氧化 CH 活化反应具有高催化活性。