蒽桥联的胺-胺电子耦合研究
收稿日期: 2016-06-13
修回日期: 2016-07-17
网络出版日期: 2016-08-10
基金资助
国家自然科学基金(Nos.21271176,21472196,21521062,21501183)和中国科学院战略性先导科技专项(No.XDB12010400)资助项目
Amine-Amine Electronic Coupling through an Anthracene Bridge
Received date: 2016-06-13
Revised date: 2016-07-17
Online published: 2016-08-10
Supported by
Project supported by the National Natural Science Foundation of China (Nos.21271176, 21472196, 21521062, 21501183), and the Strategic Priority Research Program of the Chinese Academy of Sciences (No.XDB12010400).
合成了1,5-二(对甲氧基二苯胺)蒽(1)、2,6-二(对甲氧基二苯胺)蒽(2)和9,10-二(对甲氧基二苯胺)蒽(3)三种化合物,对它们的电化学、吸收和发射光谱、光谱电化学以及胺-胺电子耦合开展研究.三种化合物在+0.6~+1.0 V vs Ag/AgCl区域存在两步可逆氧化还原过程,两个氧化还原过程电位差△E在100 mV左右.单电子氧化产物1·+在近红外区域观测到弱价间电荷转移吸收(IVCT),电子耦合常数Vab估算为600 cm-1.化合物3·+观测到强IVCT吸收,其Vab估算为1440 cm-1.单电子氧化产物2·+则没有观测到明显IVCT吸收,表明有机胺在蒽桥基上的取代位置对胺-胺电子耦合程度有重要的影响.
冯骏 , 邵将洋 , 龚忠亮 , 钟羽武 . 蒽桥联的胺-胺电子耦合研究[J]. 有机化学, 2016 , 36(10) : 2407 -2412 . DOI: 10.6023/cjoc201606020
Three diamine compounds with an anthracene bridge were synthesized and characterized, including 1,5-bis(di-p-anisylamine)anthracene (1), 2,6-bis(di-p-anisylamine)anthracene (2) and 9,10-bis(di-p-anisylamine)anthracene (3). The elec-trochemistry, absorption and emission spectra, spectroelectrochemistry, and amine-amine electronic coupling of these compounds were examined. All compounds display two consecutive redox couples in the potential region between +0.6 and +1.0 V vs Ag/AgCl, with a potential splitting △E of around 100 mV. In the one-electron-oxidized state, weak intervalence charge transfer (IVCT) transitions were observed for 1·+ in the near-infrared (NIR) region and the electronic coupling parameter Vab was calculated to be 600 cm-1. In contrast, compound 3·+ displays an intense IVCT band in the NIR region with a Vab value of 1440 cm-1. However, no distinct IVCT band was discernable for 2·+, indicative of an eligible electronic coupling. This work demonstrates that the positions of the amine substituents on the anthracene bridge play a critical role in determining the degree of amine-amine electronic coupling.
Key words: amines; charge transfer; electrochemistry; photochemistry
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