具有AIE效应的荧光超分子聚合物的表征

摘要作为高分子科学和超分子化学的结合体，超分子聚合物在近几十年内收到了广泛地关注。相比较于传统的由共价键形成的聚合物，那些重复单元是由非共价键形成的超分子聚合物由于其动态流动性则呈现出一些非常有趣的特性，例如多重刺激响应性、自修复特性和形状记忆特性。根据不同的非共价键相互作用，例如氢键、金属相互作用、堆叠、电荷转移和主客体相互作用，可以制备不同种类的超分子聚合物。现今，超分子聚合物的研究逐步从超分子聚合物的制备和表征转向对超分子聚合物的功能化研究，这对于超分子聚合物未来的应用是非常重要的。73038

四苯乙烯(TPE)是一种可以在高浓度下或者固体状态下发出明亮荧光的荧光发色团。相比于在稀溶液发射强荧光而在高浓度或者固体状态下不发光的传统有机荧光发色团，TPE基团的聚集诱导发光效应(AIE效应)这一特性使其成为了用来连接超分子聚合物的非常好的荧光分子，这是因为超分子聚合物仅仅只能在相对的高浓度下形成。

在本章中，我们构建了一个具有AIE效应的超分子聚合物，该超分子聚合物是由低分子的单体化合物通过苯并24-冠-8(DB24C8)和二季铵盐(DBA)之间的主客体相互作用形成的。该超分子聚合物由于含有AIE效应的TPE发色团从而发出比单体更加强的荧光。有趣的是，通过逐步加入金属Pd2+离子，该超分子聚合物的荧光强度则会逐渐猝灭，因此该体系可以用来检测金属Pd2+离子。

Supramolecular polymers, obtained as a result of the integration of polymer science and supramolecular chemistry, have received considerable attention during the last decade。 Compared with the traditional covalent bonds linked polymers, supramolecular polymers whose repeating units are joined together by non-covalent bonds often exhibit some interesting properties such as stimuli-responsiveness, selfhealing, and shape memory due to their dynamic nature。 Different kinds of supramolecular polymers were prepared based on different non-covalent interactions such as hydrogen bonding, metal–ligand, π–π stacking, charge transfer, and host–guest interactions。 Nowadays, the studies of supramolecular polymers have gradually turned from the preparation and characterization of supramolecular polymers to the functionality of supramolecular polymers, which is of significant importance for their future applications。

Tetraphenylethylene (TPE) is a fluorescent chromophore which shows bright fluorescence emissions with an increase in the concentration or in the solid state。 Compared with the conventional organic chromophores that display strong fluorescence in dilute solutions and are non-emissive at high concentrations or in the solid state, the aggregation induced emission (AIE) properties of TPE make it an excellent fluorescent molecule to dock with supramolecular polymers because supramolecular polymers only form at relative high concentrations。 Herein, we report a supramolecular polymer formed by crown ether-based host–guest interactions with tetraphenylethylene moieties as the chromophore。 It exhibits much higher fluorescence emissions than its monomer due to the AIE properties of TPE。 Interestingly, the fluorescence intensity of the supramolecular polymer decreased dramatically by the addition of Pd2+ ions, hence it can be used in the detection of Pd2+ ions。

毕业论文关键词：荧光超分子聚合物；聚集诱导效应；主-客体相互作用；金属配位作用；表征

Keyword: luorescent supramolecular polymer; aggregation induced emission effect; host-gust interaction; metal-ligand coordination; characterization

摘要 3

目录具有AIE效应的荧光超分子聚合物的表征:http://www.youerw.com/cailiao/lunwen_83181.html