Exploiting PET-RAFT polymerization mediated by cross-linked zinc porphyrins for the thermo-sensitive regulation of poly(N-isopropylacrylamide-b-acrylamide)

Phenanthroline Derivatives as Efficient Organic Photocatalysts for Visible‐Light‐Mediated PET‐RAFT Polymerization

“…[ 47 ] From Eq. (2) ( E 0 (PC •+ /PC*) = E ox –1240 nm/ λ max ), [ 44 ] the E 0 (PC •+ /PC*) values ranging of OPCs is from −1.314 to −1.695 V vs. SCE (Table 1), which is generally higher than that of the employed RAFT agents (CPADB: −0.93 V vs. SCE and BTPA: −1.21 V vs. SCE). Therefore, such reduction potentials are sufficient for the reduction of the RAFT agents.…”

“…Weak acceptor groups can endow the molecules with negative excited state reduction potential for chain transfer agent (CTA) activation. [ 44 ] More importantly, D‐A type molecules can easily adjust the absorption range to the visible region. Hence, based on the combination strategy of strong donor and weak acceptor to form D‐A type OPCs in this work, a series of OPCs modified with different electron donor groups based on phenanthroline core structure were designed and used for PET‐RAFT polymerization (Figure 1).…”

Unleashing the Power of PET-RAFT Polymerization: Journey from Porphyrin-Based Photocatalysts to Combinatorial Technologies and Advanced Bioapplications

“…Using a similar method, a range of thermoresponsive block copolymers, poly(Nisopropylacrylamide-b-acrylamide), were synthesized by varying the proportions of different monomers, using the ZnTHP-Me 2 Si (Figure 5). 53 Increasing the acrylamide content leads to a photocatalyst with a smaller energy gap and stronger hydrogen-bonding interaction between copolymer blocks and water molecules, as indicated by density functional theory calculations and radial distribution function analyses. By utilizing an emulsion-directed approach, zinc(II) 5,10,15,20tetrakis(4-aminophenyl)porphyrin nanoparticles were synthesized as heterogeneous photocatalysts for the PET-RAFT polymerization of different methacrylate monomers under visible light.…”

“…Exploiting PET-RAFT polymerization mediated by cross-linked zinc porphyrins for the thermosensitive regulation of P­(NIPAm- b -AM). Reproduced with permission from ref . Copyright 2022 Elsevier.…”

Photocontrolled RAFT polymerization: past, present, and future

“…Cross-linking between hydroxyterminated porphyrins and dichlorodimethylsilanes provided twisted 3D structures with open catalytic sites. 253,254 The effective catalytic performance was ascribed to the large surface area of catalytically active sites, prevention of aggregation of porphyrins and concomitant reduction of quenching of excited-state porphyrins.…”