15-crown-5 ether; Co catalysts; Crown-ethers; Free ions; Ion pairs; Lactides; On demands; Photo-switchable; Potassium acetate; UV-light; Catalysis
Abstract :
[en] An azobenzene-bridged 15-crown-5 ether (1) was successfully used as a photoswitchable cocatalyst for modulating the catalytic activity of potassium acetate (KOAc) in the ring-opening polymerization (ROP) ofl-lactide (l-LA) when initiated from an exogenous alcohol. By alternating exposure to daylight and UV light,1transforms the K+−OAc ion pair-like in free ions “on-demand”, resulting in an effective form of the catalytic complex. This allows the modulation of thel-LA ROP speed, switching the process from a slow to a fast state.
Disciplines :
Chemistry
Author, co-author :
De Roover, Quentin; Laboratory of Polymeric and Composite Materials, Center of Innovation and Research in Materials and Polymers (CIRMAP), University of Mons, Mons, Belgium ; Organic Synthesis and Mass Spectrometry Laboratory (S2MOs), Materials Institute, Mons, Belgium
Vucko, Timothé; Unité de Chimie Organique, Université de Namur ASBL, Namur, Belgium
{"lastName":"Vincent", "firstNames":"Stéphane P.","affiliations":["Unité de Chimie Organique, Université de Namur ASBL, Namur, Belgium"],"ids":["SC:7202465314""OR:0000-0001-6258-9058"]}
Research Institute for Materials Science and Engineering
Funders :
Fonds De La Recherche Scientifique - FNRS H2020 Marie Skłodowska-Curie Actions
Funding text :
This work was support by the Research and Innovation Staff Exchange (RISE) BIODEST H2020-MSCA-RISE-2017-778092 project. O. C. is Senior Research Associate for the F.R.S.-FNRS. T. V. is grateful to the FNRS for PDR T.0102.18 financement.
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