Adolphe Merkle Institute, University of Fribourg , Chemin des Verdiers 4, 1700 Fribourg, Switzerland.
Department of Bioengineering and Materials Science and Engineering, University of California Berkeley , Hearst Mining Building, Berkeley, California 94720-1760, United States.
J Am Chem Soc. 2017 Mar 29;139(12):4302-4305. doi: 10.1021/jacs.7b00342. Epub 2017 Mar 21.
Mechanoresponsive luminescent (MRL) materials change their emission color upon application of external forces. Many dyes with MRL behavior are known, but they normally do not display useful mechanical properties. Here, we introduce a new approach to overcome this problem, which relies on combining MRL compounds with the concept of supramolecular polymerization. As a first embodiment, a cyano-substituted oligo(p-phenylenevinylene), whose MRL behavior is associated with different solid-state assemblies, was derivatized with two ureido-4-pyrimidinone groups, which support the formation of a dynamic supramolecular polymer. The new material displays the thermomechanical characteristics of a supramolecular polymer glass, offers three different emission colors in the solid state, and exhibits both MRL and thermoresponsive luminescent behavior.
力致发光（MRL）材料在施加外力时会改变其发射颜色。已知许多具有 MRL 行为的染料，但它们通常不具有有用的机械性能。在这里，我们引入了一种克服此问题的新方法，该方法依赖于将 MRL 化合物与超分子聚合的概念相结合。作为第一个实施方案，用两个脲基-4-嘧啶酮基团对氰基取代的寡聚（对苯乙炔）进行衍生化，该基团支持形成动态超分子聚合物。新材料显示出超分子聚合物玻璃的热机械特性，在固态下提供三种不同的发射颜色，并表现出 MRL 和热敏发光行为。
