Pyridine based 4,4ʹ-(1,4-phenylene)-bis-2,6-di-coumarins were designed and synthesized under conventional method with more than 70% yield. Fascinatingly, the thermal studies of all the compounds were investigated, wherein all the compounds are thermally more stable up to the melting range 280–350 °C. Optical properties of all the compounds were studied, wherein single absorption maxima except compound 3b, which shows two absorption maxima. Interestingly, only compound 3b exhibited dual fluorescence as compared to other scaffolds and the band gap of all the compounds were determined.

中文翻译：

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4,4′-[（（1,4-亚苯基）-4,4'-[（1,4-亚苯基）-双-2,6-二香豆基]吡啶衍生物）的合成，热学和光学表征

以常规方法设计并合成了吡啶基的4,4′-（1,4-亚苯基）-双-2,6-二香豆素，收率超过70％。令人着迷的是，对所有化合物的热学研究进行了研究，其中所有化合物在280-350°C的熔点范围内都具有更高的热稳定性。研究了所有化合物的光学性质，其中除了化合物3b以外，其单吸收最大值显示出两个吸收最大值。有趣的是，与其他支架相比，仅化合物3b表现出双重荧光，并确定了所有化合物的带隙。