Metal-free atom transfer radical polymerization with ppm catalyst loading under sunlight.
basic_science · Level V
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- Record sourced from PubMed, PMID 33462235.
- Also identified by DOI 10.1038/s41467-020-20645-8 and PMC identifier 7814125.
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Abstract
Organocatalytic atom transfer radical polymerization (O-ATRP) is recently emerging as an appealing method for the synthesis of metal-free polymer materials with well-defined microstructures and architectures. However, the development of highly effective catalysts that can be employed at a practical low loading are still a challenging task. Herein, we introduce a catalyst design logic based on heteroatom-doping of polycyclic arenes, which leads to the discovery of oxygen-doped anthanthrene (ODA) as highly effective organic photoredox catalysts for O-ATRP. In comparison with known organocatalysts, ODAs feature strong visible-light absorption together with high molar extinction coefficient (ε<sub>455nm</sub> up to 23,950 M<sup>-1</sup> cm<sup>-1</sup>), which allow for the establishment of a controlled polymerization under sunlight at low ppm levels of catalyst loading.