Institute of Chemistry, College of Science, University of the Philippines Diliman, Quezon City, 1101, Philippines.
Materials Science and Engineering, College of Science, University of the Philippines Diliman, Quezon City, 1101, Philippines.
Chem Asian J. 2022 Jun 15;17(12):e202200193. doi: 10.1002/asia.202200193. Epub 2022 May 11.
The reversible photo-induced [4+4] cycloaddition reaction of anthracene enables multiple cycles of dimerization and scission, allowing phototunable linkage of molecular fragments for the synthesis of polymer scaffolds. New functional materials ranging from hydrogels to shape-memory polymers were designed from anthryl-polymer systems because of their diverse photochemical reactivity and responsiveness. Light as an external stimulus allows for the remote and precise spatiotemporal control of materials without the need for additional reagents. Depending on how the photoreactive anthracene moieties were introduced, the interaction of anthryl-polymer systems with light results in various processes such as polymerization, cyclization, and cross-linking. Structural modifications of anthracene derivatives could shift their absorption from the ultraviolet to the visible light region, widening their range of applications including biologically relevant studies. These applications are further diversified and enhanced by the reversibility of the dimerization reaction using light and heat as stimuli. In this review, current developments in the synthesis and photodimerization of anthracene-containing polymers and their emerging applications in the fabrication of new materials are discussed.
蒽的可逆光诱导[4+4]环加成反应能够实现二聚体的多次循环和断裂，从而允许对分子片段进行光可调连接，以合成聚合物支架。由于其多样化的光化学反应性和响应性，从水凝胶到形状记忆聚合物等新型功能材料都可以从蒽基聚合物体系中设计出来。光作为外部刺激，可以远程和精确地控制材料的时空，而无需额外的试剂。根据引入的光活性蒽部分的不同，蒽基聚合物系统与光的相互作用会导致聚合、环化和交联等各种过程。蒽衍生物的结构修饰可以将其吸收从紫外线转移到可见光区域，从而扩大其应用范围，包括与生物学相关的研究。通过光和热作为刺激来可逆地进行二聚反应，可以进一步多样化和增强这些应用。在本文中，我们讨论了含蒽聚合物的合成和光二聚化的最新进展，以及它们在新型材料制造中的新兴应用。
