Synthesis And Photocatalytic Hydrogen Production Of Perylene Derivatives And Polypyridyl Ruthenium Complexes

To slove the environmental problems and develope the new energy，artificialphotosynthesis is always an attractive approach for chemists. Perylene derivativesespecially perylenediimide have a high fluorescence quantum yield, good lightstability and wide absorption bands,it is a good choice if it was used as aphotosensitizer in photocatalytic system. The research of photocatalytic CO2reducedto CO started late. If we use bipyridine ruthenium complexes which we have a betterunderstanding to resreach photocatalytic reduction of CO2, it will help us have afurther understanding in the process of photocatalytic reduction about CO2.We have designed and synthesized peryleneimides(P2，P3，P4) with differentsubstituents and ruthenium complexes R1in this paper. We characterized theirUV-visible absorption, fluorescence emission spectra, electrochemical properties,andhad a preliminary exploration about their photocatalytic properties.P4not only has the strongest absorption and emission and chemically robust,but also exhibits a higher hydrogen production capacity compared with several otherperylene derivatives when we used colloidal Pt as the catalyst, TEOA as thesacrificial agent in photocatalytic system. When we used FeCl3, CoCl2, NiCl2as acatalyst respectively for the photolysis system about hydrogen production, wereceived only a little H2. Different sacrificial agent has different effects for thehydrogen production capacity of P4. The presence of TEA promotes decompositionof P4, but TEOA has a stabilizing effect on the system.R2and R1have a good absorption in the visible region. R2with more electrondonor groups has a better visible-light absorption capacity, but has a lowerfluorescence emission capability than R1. Otherwise, Cyclic voltammetry diagramshows that the complex R1and R2have stable photo-electrochemical properties. R1,R2was used as photosensitizer respectively in the photocatalytic system to theresearch of H2and CO2reduction, which was organized by FeCl3as catalyst andTEOA as catalyst. Water was used as reaction solvent in the system of hydrogenproduction and DMF in the system of CO2reduction. The results show, R2has a higher hydrogen yield, but has a lower capability on CO2reduced to CO than R1. Thesame components R1, R2photocatalytic system, in the case of using a mixed solventof water and DMF, H+was restored preferentially, and only trace amounts of CO wasproduced. We believe that the ability to get electronic of H+is better than CO2.