Experimental and Theoretical Examination of the Radical Cations Obtained from the Chemical and Electrochemical Oxidation of 5-Aminothiazoles
作者:Kirara Yamaguchi、Toshiaki Murai、Shoichi Kutsumizu、Yohei Miwa、Masahiro Ebihara、Jing-Dong Guo、Norihiro Tokitoh
DOI:10.1002/open.201700016
日期:2017.4
Chemical or electrochemical one‐electron oxidation of 5‐N‐arylaminothiazoles was found to afford stable radical cations. For chemical oxidation, 1 equivalent of [(4‐BrC6H4)3N][SbCl6] (Magic Blue, MB) was added to CH2Cl2 solutions of the thiazoles, and the thus‐obtained radicals showed light absorption in the near‐infrared region. Electrochemical oxidation also led to bathochromic shifts in the absorption
发现5- N-芳基氨基噻唑的化学或电化学单电子氧化可提供稳定的自由基阳离子。为了进行化学氧化,将1当量的[(4-BrC 6 H 4)3 N] [SbCl 6 ](Magic Blue,MB)添加到CH 2 Cl 2中噻唑溶液以及由此获得的自由基在近红外区域显示出光吸收。电化学氧化还导致吸收带中的红移,并且获得的光谱与从化学氧化物质衍生的光谱相似。这些自由基提供的电子顺磁共振(EPR)光谱与稳定氮自由基的概念一致(半衰期≤385 h)。当添加> 3当量的MB时,在5位氮原子上包含4-二甲基氨基苯基的噻唑的EPR光谱发生显着变化。从理论计算中得出了实验获得的自由基阳离子的电子结构的详细信息。