We have synthesised a new organic/inorganic hybrid, in which electroactive aniline tetramer is grafted on the surface of quasi-monodispersed CdSe nanocrystals. The grafting reaction consists of two steps. First initial nanocrystal surface ligands (TOPO) are exchanged for 4-formyldithiobenzoate linker ligands, which contain an anchor function (the dithioate group) and an aniline grafting function (the aldehyde group). The condensation reaction between the primary amine group of aniline tetramer and the aldehyde group of the linker ligand results in the grafting of the former with simultaneous formation of an azomethine linkage between both reagents. The grafting reaction is nearly quantitative as demonstrated by 1H NMR, FTIR and XPS studies. Voltammetric, UV-visible and EPR spectroelectrochemical studies of the hybrid compound show that after the grafting process the polyconjugated molecule retains its electrochemical activity i.e. electrochemical switching between the completely reduced state (leucoemeraldine), the semi-oxidised state (emeraldine) and the completely oxidised state (pernigraniline) is possible.
我们合成了一种新型有机/无机杂化物,其中电活性
苯胺四聚体接枝在准单分散 CdSe 纳米晶体的表面。接枝反应由两个步骤组成。首先将初始纳米晶体表面
配体 (TOPO) 替换为 4-甲酰基二
硫代苯甲酸酯连接
配体,该
配体包含锚定功能(二
硫代酸酯基团)和
苯胺接枝功能(醛基)。
苯胺四聚体的
伯胺基团和连接
配体的醛基团之间的缩合反应导致前者接枝,同时在两种试剂之间形成偶氮甲碱键。 1H NMR、FTIR 和 XPS 研究表明,接枝反应几乎是定量的。杂化化合物的伏安法、紫外可见光和 EPR 光谱电
化学研究表明,接枝过程后,聚共轭分子保留了其电
化学活性,即在完全还原态(无色翠绿
亚胺)、半氧化态(翠绿翠
亚胺)和完全氧化态之间进行电
化学转换。状态(pernigraniline)是可能的。