作者:Yi Tian、Kazuyuki Uchida、Hiroyuki Kurata、Yasukazu Hirao、Tomohiko Nishiuchi、Takashi Kubo
DOI:10.1021/ja507005c
日期:2014.9.10
in organic reactions and with applications as new functional materials. However, the elusive nature of these radicals makes the synthesis, isolation, and characterization very challenging. In this work, the synthesis of three long-lived, fluorenyl-based radicals are reported. The geometry and electronic structures of these radicals were systematically investigated with a combination of various experimental
长期以来,有机中性自由基一直让化学家着迷,因为他们对有机反应中的结构-反应性关系有基本的了解,并且作为新功能材料的应用。然而,这些自由基难以捉摸的性质使得合成、分离和表征非常具有挑战性。在这项工作中,报告了三个长寿命的芴基自由基的合成。除了密度泛函理论 (DFT) 计算,包括 X 射线晶体学分析、电子自旋共振 (ESR)、电子核双共振 (ENDOR) 外,还结合各种实验方法系统地研究了这些自由基的几何和电子结构、循环伏安法和 UV-vis-NIR 测量。还确定了它们在环境条件下空气饱和溶液中的半衰期 (τ(1/2))。令人惊讶的是,所有三个自由基都表现出显着的稳定性:τ(1/2) = 7、3.5 和 43 天。