derivatives serving as buildingblocks for organicelectronicmaterials was developed. Key steps during synthesis were either Ullmann condensations or nucleophilic aromatic substitutions giving rise to structural modification of triphenylamines and their electronic nature. In turn, these scaffolds were exemplarily attached to a dendritic tris(2-thienyl)benzene core affording star shaped organic semiconducting
针对一系列用作有机电子材料构建基的各种取代的三苯胺衍生物,开发了一种通用的合成方案。合成过程中的关键步骤是Ullmann缩合或亲核芳族取代,这会引起三苯胺的结构修饰及其电子性质。依次地,这些支架示例性地附接到树状三(2-噻吩基)苯核上,提供星形有机半导体材料,其表征了其光物理,电化学和热性质。观察到取代基的性质对星形目标化合物的光物理和形态薄膜特性都具有强烈的影响。-3 cm 2 V -1 s -1。材料的性能可以与所应用的取代基相关。
Tuning of intervalence charge transfer energies by substituents in one-dimensional bis(triarylamine) systems
作者:Christoph Lambert、Gilbert Nöll
DOI:10.1039/b207736a
日期:——
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.
A series of novel star-shaped porphyrin-triarylamine conjugates were synthesized by palladium-catalyzed cross-coupling reactions. The spectroscopic and electrochemical studies show that d-conjugation of the porphyrin core is extended to the triarylamine moieties.