Despite having been known for a long time, quaternary 4,4′-bipyridinium salts, or viologens, are still a highly inspiring class of compounds, thanks to their peculiar redox and charge transfer properties. However, more complex structures containing multiple pyridinium rings, also interspaced by conjugated moieties, allow an even wider synthetic variability and tunability of their characteristics. The compound described herein is a star-shaped, fully conjugated molecule with three methylated pyridinium rings connected by a triple bond spacer to a central benzene core, which was synthesized from readily available building blocks, representing a quite simple model of multi-pyridyl extended viologen; its UV–visible absorption and fluorescence spectra have also been investigated.

中文翻译：

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4,4′,4″-(苯-1,3,5-三基三(乙炔-2,1-二基))三(1-甲基吡啶-1-鎓)碘化物

尽管 4,4'-联吡啶鎓季盐或紫精早已为人所知，但由于其独特的氧化还原和电荷转移特性，它仍然是一类极具启发性的化合物。然而，包含多个吡啶鎓环的更复杂的结构，也通过共轭部分间隔，允许更广泛的合成可变性和其特性的可调性。本文描述的化合物是一种星形、完全共轭的分子，具有三个甲基化吡啶鎓环，通过三键间隔基连接到中心苯核心，该分子是由容易获得的结构单元合成的，代表了多吡啶基延伸紫精的非常简单的模型; 还对其紫外-可见吸收和荧光光谱进行了研究。