Two-dimensional materials as an efficient photo-initiation sources for click chemistry Azra Kocaarslan Karlsruhe Institue of Technology, Germany, Karlsruhe Institue of Technology, Turkey Light has become the indivisible part of synthetic chemistry in the last two decades [1]. It provides a powerful approach to various chemical transformations in terms of its distinctive ability to meet the energetic requirements to achieve diverse reactions. Solar energy has been recognized as a renewable energy source. However, many studies show that it cannot be benefited from solar energy enough on account of more than 90% of the rays from the sun falling in the visible and near-infrared region (NIR) of the spectrum. Inevitably, many photo-induced studies have shifted their focus from the ultraviolet (UV) region to the long wavelength in the electromagnetic spectrum. Two-dimensional (2D) materials are one of the best candidates that enable the reactions to take place at higher wavelengths in an efficient and environmentally friendly way. These materials show a wide range of activity from small molecule synthesis to large macromolecule design. They can generate electron-hole pairs upon light irradiation which is a very efficient initiating process for electron transfer reactions. The resulting electron is transferred to the surface and interacts with the responsible molecules and initiates the photo-redox reaction. Notably, they hold great potential as efficient photo-initiation sources for click chemistry because of providing both suitable radical-forming species and the electron required in the click initiation mechanism [2]. As well known, click chemistry relies on the rapid and selective formation of covalent bonds under mild conditions, making it highly desirable for various applications. In this regard, the use of these 2D materials to initiate CuAAC click chemistry also fulfills the click chemistry requirements in terms of mild reaction conditions. This abstract highlights recent advances in harnessing 2D materials, such as graphitic carbon nitride, black phosphorus, and bismuthene as photo-initiators in CuAAC reactions [3-4]. We discuss the unique properties of these 2D materials that make them ideal candidates for initiating click reactions in the NIR region, including their strong light absorption (between 200 nm-1400 nm), high surface area, and tunable electronic properties. Furthermore, we explore the mechanisms by which these materials facilitate the generation of reactive species upon light irradiation, driving the click chemistry reactions with enhanced efficiency and precision. References
1. Chatani S.,Kloxin C. J. b andBowman C.N. , Polymer Chemistry , 2014,5, 2187-2201 2. Kumar V., Lal K., Naveen, Tittal R. K., Catalysis Communications , 2023, 176, 106629.
3. Kocaarslan A., Sumer I., Esen C., Kumru B., Eryurek G.,Yagci Y., Polymer Chemistry, 2022,13, 6393. 4. Kocaarslan A., Eroglu Z., Metin O., Yagci Y., Beilstein Journal of Organic Chemistry , 2021, 17, 2477-2487.
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© The Author(s), 2023
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