Remarkable Interplay of Redox States and Conformational Changes in a Sterically Crowded, Cross-Conjugated Tetrathiafulvalene Vinylog
作者:Samia Amriou、Igor F. Perepichka、Andrei S. Batsanov、Martin R. Bryce、Concepció Rovira、José Vidal-Gancedo
DOI:10.1002/chem.200600244
日期:2006.7.17
spectroscopy, combined with theoretical calculations performed at the B3LYP/6-31G(d) level, elucidate the interplay of the electronic and structural properties in these molecules. For compound 10, multistage redox behavior is observed: the overall electrochemical process can be represented by 10-->10(.+)-->10(2+)-->10(4+) with good reversibility for the 10-->10(.+)-->10(2+) transformations. At the tetracation
使用(1,3-二硫醇-2-基)膦酸酯试剂与噻吨酮-9-的Horner-Wadsworth-Emmons反应合成了9- [2-(1,3-二硫醇-2-亚乙基)亚乙基]噻吨蒽的衍生物。亚炔基-乙醛(5)。进一步的反应导致空间上拥挤的交叉共轭的“乙烯基四硫富瓦烯”衍生物9- [2,3-双-(4,5-二甲基-1,3-二硫醇-2-亚基)-亚丙基]噻吨并(10)。X射线晶体学,溶液电化学,光谱学,光谱电化学以及同步电化学和电子顺磁共振光谱学,结合在B3LYP / 6-31G(d)级进行的理论计算,阐明了这些电子和结构性质之间的相互作用分子。对于化合物10,观察到多级氧化还原行为:整个电化学过程可以用10-> 10(。+)-> 10(2 +)-> 10(4+)表示,对于10-> 10(。+)->具有良好的可逆性10(2+)个转换。在四阳离子阶段,在二硫鎓和噻吨鎓环上获得最大的芳香性增加。理论预测,对于10