Selective and Rapid Light-Induced RAFT Single Unit Monomer Insertion In Aqueous Solution
Document Type
Article
Publication Date
1-1-2020
School
Polymer Science and Engineering
Abstract
The photocatalyst Zn(II) meso‐tetra(4‐sulfonatophenyl)porphyrin (ZnTPPS) is found to substantially accelerate visible‐light‐initiated (red, yellow, green light) single unit monomer insertion (SUMI) of N,N‐dimethylacrylamide into the reversible addition–fragmentation chain transfer (RAFT) agent, 4‐((((2‐carboxyethyl)thio)carbonothioyl)thio)‐4‐cyanopentanoic acid (RAFT1), in aqueous solution. Thus, under irradiation with red (633 nm) or yellow (593 nm) light with 50 mpm (moles per million mole of monomer) ZnTPPS at 30 °C, the rate enhancement provided by photoinduced energy or electron transfer (PET) is ≈sevenfold over the rate of direct photoRAFT‐SUMI (without catalyst), which corresponds to achieving full and selective reaction in hours versus days. Importantly, the selectivity, as judged by the absence of oligomers, is retained. Under green light at similar power, higher rates of SUMI are also observed. However, the degree of enhancement provided by PET‐RAFT‐SUMI over direct photoRAFT‐SUMI as a function of catalyst concentration is less and some oligomers are formed.
Publication Title
Macromolecular Rapid Communications
Volume
41
Issue
1
Recommended Citation
Zhou, Y.,
Zhang, Z.,
Reese, C. M.,
Patton, D. L.,
Xu, J.,
Boyer, C.,
Boyer, C.,
Postma, A.,
Moad, G.
(2020). Selective and Rapid Light-Induced RAFT Single Unit Monomer Insertion In Aqueous Solution. Macromolecular Rapid Communications, 41(1).
Available at: https://aquila.usm.edu/fac_pubs/16926