Angewandte Chemie - International Edition
Angewandte Chemie - International Edition
5 years ago

Color-Change Photoswitching of an Alkynylpyrene Excimer Dye

Color-Change Photoswitching of an Alkynylpyrene Excimer Dye
Shenliang Wang, Eric T. Kool, Ke Min Chan, Dominik K. Kölmel
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. DNA-based photoswitch: A DNA-based dimeric dye that visibly changes color from green to blue upon UV irradiation is described. A novel bis-alkyne [2+2+2] cycloaddition with oxygen is proposed as a mechanism for the color change in air (see picture).

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201701235

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