Photochemistry
Green-light ATRP that tolerates open air
Open access · cc by · source: Europe PMC
Eosin Y plus a copper ATRP catalyst polymerizes OEOMA under green light in open vials, giving low dispersity even at 1000 rpm stirring.
Key findings
Without EY, no conversion. EY without copper gave 89% conversion but Đ = 4.30. EY + Cu gave ~88% conversion and Đ = 1.19. Stirring up to 1000 rpm still kept Đ < 1.18. Even 7.5 μM EY (25 ppm) gave 80% conversion and Đ = 1.16. Oxidative quenching of 3EY* by Cu(II) is downhill (ΔGet = −0.92 eV).
Methodology
They ran photo-ATRP of OEOMA500 in PBS/DMSO open vials with eosin Y (EYH2), CuBr2, and TPMA under green light. Controls omitted EY or copper. Kinetics, SEC, Stern–Volmer quenching, and ΔGet estimates compared oxidative vs reductive quenching of 3EY*.
Limitations
Oxygen tolerance is demonstrated for this aqueous OEOMA system; hydrophobic monomers in DMSO are only briefly extended. Protein/DNA hybrids are claimed but cytocompatibility is comparative, not a full toxicology study.
How this study connects
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