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- W2894880217 abstract "In aqueous media, negative photochromism can occur from cationic, protonated merocyanines (MCH+) to spiropyrans (SP) upon exposure to visible light. Herein, we demonstrate the uniquely simple manner in which polymers can tune the key properties of these photochromes through copolymer preparation. Nine water-soluble, SP-containing polymers yield wide ranges of key properties for negative photochromism—accessible MCH+ pKa values spanning 5 pH units, quantum yields of photochemical ring closure up to 0.2, and rates of thermal equilibration ranging 2 orders of magnitude. In buffered solutions, many of these polymers showed photostationary states with greater than 80% conversion to SP and no detectable photochromic fatigue over 15 cycles. These results demonstrate the potential for tuning key properties of the MCH+ photochrome through both the spiropyran pendants themselves and the water-solubilizing comonomers. The dependence of MCH+ pKa on comonomer structure enabled tunable range of pH for reversible photoa..." @default.
- W2894880217 created "2018-10-12" @default.
- W2894880217 creator A5052109478 @default.
- W2894880217 creator A5072462432 @default.
- W2894880217 date "2018-10-03" @default.
- W2894880217 modified "2023-09-24" @default.
- W2894880217 title "Tuning the Negative Photochromism of Water-Soluble Spiropyran Polymers" @default.
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- W2894880217 doi "https://doi.org/10.1021/acs.macromol.8b01915" @default.
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