The Interplay of Inverted Redox Potentials and Aromaticity in the Oxidized States of New π-Electron Donors: 9-(1,3-Dithiol-2-ylidene)fluorene and 9-(1,3-Dithiol-2-ylidene)thioxanthene Derivatives
作者:Samia Amriou、Changsheng Wang、Andrei S. Batsanov、Martin R. Bryce、Dmitrii F. Perepichka、Enrique Ortí、Rafael Viruela、José Vidal-Gancedo、Concepció Rovira
DOI:10.1002/chem.200501326
日期:2006.4.12
single, two-electron oxidation process. The latter is due to the aromatic structure of the thioxanthenium cation (formed on the loss of a second electron), which stabilises the dication state (10(2+)) compared with the radical cation. This contrasts with the nonaromatic structure of the fluorenium cation of system 9. The two-electron oxidation wave in the thioxanthene derivatives is split into two separate
使用(1的Horner-Wadsworth-Emmons反应合成了9-(1,3-二硫基-2-亚基)芴(9)和9-(1,3-二硫基-2-亚基)噻吨(10)的衍生物,3-二硫醇-2-基)膦酸酯试剂与芴酮和噻吨酮-9-一。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(SEEPR),结合在B3P86 / 6-31G **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。这些化合物是强的两电子给体,并且氧化电势取决于氧化态的电子结构。对于9-(1,3-二硫醇-2-亚基)芴系统,观察到两种单电子氧化(E(1)ox E(1)ox),导致单双电子氧化过程。后者是由于噻吨锡阳离子的芳族结构(由于失去第二个电子而形成),与自由基阳离子相比,该结构稳定了离子状态(10(2+))。这与系统9的氟阳离子的非芳族结构形成对比。噻吩并蒽衍生物中的双电子氧化波由于离子状态的不稳定而