Investigation of 2,6-disubstituted N,N,N′,N′-tetramethyl-p-phenylenediamines as precursors/building blocks for molecular magnets
作者:Gerald Schwarzenbacher、Bernd Evers、Ingo Schneider、Anna de Raadt、Jürgen Besenhard、Robert Saf
DOI:10.1039/b102564n
日期:2002.2.22
The synthesis of 2,6-disubstituted N,N,Nâ²,Nâ²-tetramethyl-p-phenylenediamines (RÂ =Â Cl, Br, I, CN, or CCSi(CH3)3), potential precursors/building blocks for molecular magnets, is presented. In addition to standard methods (1H NMR, 13C NMR, MS, IR, UV), the products were also characterised by means of cyclic voltammetry. Completely reversible electrochemical behaviour was observed for both the CN and the CCSi(CH3)3 derivatives. Moreover, the corresponding radical cations and the dications were observed by cyclic voltammetry for these compounds. The first oxidation step of the Cl and the Br derivatives was also found to be reversible, although a chemical side reaction was detected after oxidation to the corresponding dication. The radical cation could not be detected for the I derivative.
In this case direct oxidation to the dication followed by a chemical reaction was observed.
本文介绍了 2,6-二取代的 N,N,Nâ²,Nâ²-四甲基对苯二胺(RÂ = Cl、Br、I、CN 或 CCSi(CH3)3)的合成,它们是分子磁体的潜在前体/构件。除了标准方法(1H NMR、13C NMR、MS、IR、UV)之外,还通过循环伏安法对产品进行了表征。在 CN 和 CCSi(CH3)3 衍生物中都观察到了完全可逆的电化学行为。此外,通过循环伏安法还观察到了这些化合物相应的自由基阳离子和二阳离子。还发现 Cl 和 Br 衍生物的第一个氧化步骤是可逆的,尽管在氧化成相应的二阳离子后检测到了化学副反应。I 衍生物检测不到自由基阳离子,在这种情况下,观察到直接氧化成二阳离子,然后发生化学反应。