PDF(Pubmed)
Abstract：
Anthracenes are an important class of acenes. They are being utilized more and more often in chemistry and materials sciences, due to their unique rigid molecular structure and photoreactivity. In particular, photodimerization can be harnessed for the fabrication of novel photoresponsive materials. Photodimerization between the same anthracenes have been investigated and utilized in various fields, while reactions between varying anthracenes have barely been investigated. Here, Nuclear Magnetic Resonance (NMR) spectroscopy is employed for the investigation of the photodimerization of two exemplary anthracenes: anthracene (A) and 9-bromoanthracene (B), in the solutions with only A or B, and in the mixture of A and B. Estimated k values, derived from the presented kinetic model, showed that the dimerization of A was 10 times faster in comparison with B when compounds were investigated in separate samples, and 2 times faster when compounds were prepared in the mixture. Notably, the photoreaction in the mixture, apart from AA and BB, additionally yielded a large amount of the AB mixdimer. Another important advantage of investigating a mixture with different anthracenes is the ability to estimate the relative reactivity for all the reactions under the same experimental conditions. This results in a better understanding of the photodimerization processes. Thus, the rational photofabrication of mix-anthracene-based materials can be facilitated, which is of crucial importance in the field of polymer and material sciences.
摘要：
蒽是一类重要的并苯。它们越来越多地用于化学和材料科学，由于其独特的刚性分子结构和光反应性。特别是,光二聚化可用于制造新型光响应材料。相同蒽之间的光二聚已经在各个领域进行了研究和利用。虽然几乎没有研究过不同蒽之间的反应。这里,核磁共振（NMR）光谱用于研究两种示例性蒽的光二聚作用：蒽（A）和9-溴蒽（B），在只有A或B的解决方案中，在A和B的混合物中，估计k值，从给出的动力学模型中得出，结果表明，当在单独的样品中研究化合物时，A的二聚化比B快10倍，在混合物中制备化合物时，速度快2倍。值得注意的是,混合物中的光反应，除了AA和BB，另外产生了大量的ABmixdimer。研究具有不同蒽的混合物的另一个重要优点是能够在相同的实验条件下估计所有反应的相对反应性。这导致对光二聚化过程的更好理解。因此，可以促进混合蒽基材料的合理光加工，这在聚合物和材料科学领域至关重要。
