Quinoline Photobasicity: Investigation within Water-Soluble Light-Responsive Copolymers

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Weinheim : Wiley-VCH

Quinoline photobases exhibit a distinctly higher pKa in their electronically excited state than in the ground state, thereby enabling light-controlled proton transfer reactions, for example, in molecular catalysis. The absorption of UV light translates to a pKa jump of approximately 10 units, as established for small-molecule photobases. This contribution presents the first synthesis of quinoline-based polymeric photobases prepared by reversible addition-fragmentation chain-transfer (RAFT) polymerization. The integration of quinolines as photobase chromophores within copolymers offers new possibilities for light-triggered proton transfer in nanostructured materials, that is, in nanoparticles, at surfaces, membranes and interfaces. To exploit the light-triggered reactivity of photobases within such materials, we first investigated how the ground- and excited-state properties of the quinoline unit changes upon polymer integration. To address this matter, we combined absorption and emission spectroscopy with time-resolved transient-absorption studies to reveal photoinduced proton-transfer dynamics in various solvents. The results yield important insights into the thermodynamic and kinetic properties of these polymeric quinoline photobases. © 2020 The Authors. Chemistry - A European Journal published by Wiley-VCH GmbH

light-responsive polymers, photoswitch photobasicity, quinoline, transient absorption spectroscopy
Sittig, M., Tom, J. C., Elter, J. K., Schacher, F. H., & Dietzek, B. (2021). Quinoline Photobasicity: Investigation within Water-Soluble Light-Responsive Copolymers (Version publishedVersion, Vol. 27). Version publishedVersion, Vol. 27. Weinheim : Wiley-VCH. https://doi.org//10.1002/chem.202003815