We synthesised a series of linear bis(triarylamine) species whose triarylamine redox centres have different local redox potentials which were tuned by substituents in the para-position. The mixed-valence (MV) radical cations of these systems were generated and investigated in situ by UV/Vis/NIR spectroelectrochemistry. The electronic coupling between the redox centres was analysed by the generalised Mulliken–Hush theory which gave a practically constant coupling. The radical cations of the species show an intervalence charge transfer (IV-CT) band in the NIR whose energy varies linearly with the electrochemical redox potential splitting. This correlation proves that the Marcus–Hush two-level model is an adequate way to describe the electronic situation in these linear MV systems.
我们合成了一系列线性双(
三芳胺)物种,其
三芳胺氧化还原中心具有不同的局部氧化还原电位,这些电位可通过对位取代基进行调整。这些体系的混合价(MV)自由基阳离子是通过紫外/可见/近红外光谱电
化学方法在原位生成和研究的。通过广义 Mulliken-Hush 理论分析了氧化还原中心之间的电子耦合。该物种的自由基阳离子在近红外光谱中显示出一个间隔电荷转移(IV-CT)带,其能量与电
化学氧化还原电势分裂呈线性变化。这种相关性证明,Marcus-Hush 两级模型足以描述这些线性 MV 系统中的电子情况。