Synthesis of new substituted tetrazines: electrochemical and spectroscopic properties
作者:Pierre Audebert、Saïd Sadki、Fabien Miomandre、Gilles Clavier、Marie Claude Vernières、Merzaka Saoud、Philippe Hapiot
DOI:10.1039/b310737j
日期:——
Original tetrazines substituted by heterocyclic rings have been prepared. Their syntheses, as well as their electrochemical and spectroscopic features, are described. Calculations have also been made on the cation radicals, anion radicals and neutral compounds and are in correct agreement with the experimental results. All compounds are electroactive, both in oxidation and reduction, and display two absorption bands in the UV and visible regions of the spectrum. Reduction potentials and maximum wavelengths are correlated with the electron-rich character of the heterocyclic substituent on the tetrazine ring. None of these compounds gives good quality polymers upon electro-oxidation, which was unexpected, especially for the bis(2-pyrrolyl) tetrazine. This latter result can be explained by the occurrence of a self-deprotonation equilibrium in the cation radical.
我们制备出了被杂环取代的原始四嗪。介绍了它们的合成、电化学和光谱特征。还对阳离子自由基、阴离子自由基和中性化合物进行了计算,计算结果与实验结果完全一致。所有化合物在氧化和还原过程中都具有电活性,并在光谱的紫外区和可见光区显示出两条吸收带。还原电位和最大波长与四嗪环上杂环取代基的富电子特性有关。这些化合物在电氧化时都不会产生高质量的聚合物,这是出乎意料的,尤其是双(2-吡咯基)四嗪。后一种结果可以用阳离子自由基中出现的自质子化平衡来解释。