Department of Chemistry, Stanford University, Stanford, CA, 94305, USA.
Angew Chem Int Ed Engl. 2017 Jun 1;56(23):6497-6501. doi: 10.1002/anie.201701235. Epub 2017 May 5.
We describe a photoswitchable DNA-based dimeric dye that visibly changes fluorescence from green to blue upon UV irradiation. A novel bis-alkyne-dependent [2+2+2] cycloaddition is proposed as a mechanism for the color change in air. The photoinduced structural switching results in spatial separation of stacked pyrene units, thereby causing selective loss of the excimer emission. We demonstrate and suggest several applications for this novel photoswitch.
我们描述了一种光致变色的基于 DNA 的二聚染料，它在紫外光照射下荧光从绿色明显变为蓝色。我们提出了一种新的双炔依赖性 [2+2+2] 环加成反应作为在空气中发生颜色变化的机制。光诱导的结构转换导致堆积的芘单元的空间分离，从而导致激基缔合物发射的选择性损失。我们展示并提出了这种新型光开关的几种应用。
