3 years ago

The Use of Highly Branched Polymers with Layered Structures for Mimicking Light-Harvesting Process

Yi Shi, Haifeng Gao, Daqiao Hu, Xiaosong Cao
Hyperbranched polymers (HBPs) with decorated donor and acceptor chromophores in different domains were constructed to demonstrate the function of light harvesting in a polymeric nanostructure. Taking advantage of our recently developed chain-growth copper-catalyzed azide-alkyne cycloaddition polymerization, two structural parameters in the HBPs, e.g., the molar ratio of the acceptor Coumarin 343 in the core to the donor Coumarin 2 on the periphery, and the average distance between these two layers, could be independently varied in a one-pot synthesis. Results demonstrated an efficient energy transfer (ET) from the excited Coumarin 2 to the ground-state Coumarin 343 in the core, with ET efficiency reaching as high as 98%. The excited Coumarin 343 after receiving energy from donor Coumarin 2 emitted higher fluorescence intensity than being directly excited, indicating an observed light concentration effect from periphery dye to the central dye in one polymer structure.

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

DOI: 10.1002/anie.201709492

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