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Iridium complexes incorporating coumarin moiety as catalyst photoinitiators: Towards household green LED bulb and halogen lamp irradiation |
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| Authors: | Mohamad-Ali Tehfe Jacques Lalevée Sofia Telitel Jifu Sun Jianzhang Zhao Bernadette Graff Fabrice Morlet-Savary Jean-Pierre Fouassier |
| Affiliation: | 1. Institut de Science des Matériaux de Mulhouse IS2M, LRC CNRS 7228, ENSCMu-UHA, 15, rue Jean Starcky, 68057 Mulhouse Cedex, France;2. State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, E-208 West Campus, 2 Linggong Rd., Dalian 116024, China;3. UHA-ENSCMu, 3 rue Alfred Werner, 68093 Mulhouse, France |
| Abstract: | Household LED bulbs and halogen lamps are used to promote the ring-opening photopolymerization of epoxides in the presence of a new series of iridium(III) complexes (IrCs) exhibiting enhanced visible light absorption properties through the introduction of a coumarin moiety. These latter complexes are used as catalyst photoinitiators in an oxidative cycle in combination with a silane and an iodonium salt. Remarkably, even under the selected very soft irradiations (e.g. light intensity lower than 2 mW/cm2), excellent polymerization profiles are obtained (conversions > 80%). The mechanisms are investigated by ESR and luminescence experiments. |
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