可見光激發之釕聯吡啶錯合物催化鹵素離子之氧化

This research aimed to use the photoexcited ruthenium trisbipyridine type of complexes as catalysts. The key part for solar energy conversion is to create electron separated until ready to use. Photooxidation reaction is designed to use flash-quench reaction scheme. Ruthenium complexes with high oxidation potentials such as [Ru(bpy)2(deeb)]2+, Ru(deeb)2(dmbpy)]2+, [Ru(deeb)2(bpy)]2+, and [Ru(deeb)3]2+ as well as [Ru(bpy) 3]2+ were incorporated. Photo-generated Ru3+ catalysis halide oxidation reactions. Photreduction products may interfere with the oxidation products. Fast separation of the products is crucial. Though the original plan of using micelle to separate products didn’t work, simple phase extraction worked for iodide oxidation product. Photoreduction stores electrons in benzoquinone similar to photosynthetic system. The photoexcited ruthenium trisbipyridine complex react with persulfate and produce sulfate anion radical, SO4─ which acted as initiator for hydrogel precursor cross-link. Transient absorption technique allowed detail reaction mechanism investigation. We found that Photo-generated Ru3+ may initiate the cross link reaction. Reactive radial may be eliminated from the reaction scheme and reduce the cell damage.