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Structural Effects in the Iridium Complex Series: Photoredox Catalysis and Photoinitiation of Polymerization Reactions under Visible Lights

Abstract : A series of 18 iridium complexes (Ir) have been prepared and studied. Their abilities to initiate both a ring-opening cationic polymerization (CP) using an Ir/iodonium salt couple and a free radical polymerization (FRP) in the presence of an Ir/amine/alkyl halide system under very soft irradiation (i.e., halogen lamp) or upon exposure to laser diodes @457 nm and @532 nm are investigated. Interestingly, these photoinitiating systems operate through an oxidative or a reductive photoredox catalytic cycle, respectively. Excellent polymerization profiles are obtained (reactive function conversions \\textgreater70% for the CP of an epoxide and \\textgreater60% for the FRP of low viscosity triacrylate). The photochemical mechanisms are studied by fluorescence, steady state photolysis, cyclic voltammetry, and electron spin resonance spin trapping experiments.
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https://hal-amu.archives-ouvertes.fr/hal-01774175
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Submitted on : Friday, May 4, 2018 - 11:05:07 AM
Last modification on : Wednesday, October 14, 2020 - 4:21:55 AM

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Mohamad-Ali Tehfe, Marc Lepeltier, Frederic Dumur, Didier Gigmes, Jean-Pierre Fouassier, et al.. Structural Effects in the Iridium Complex Series: Photoredox Catalysis and Photoinitiation of Polymerization Reactions under Visible Lights. Macromolecular Chemistry and Physics, Wiley-VCH Verlag, 2017, 218 (18), pp.1700192. ⟨10.1002/macp.201700192⟩. ⟨hal-01774175⟩

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