Synthesis Of BODIPY-derived Photosensitizer And Its Photocatalytic Performance

This paper belongs to the area of photochemistry and aims at designing and synthesizing a series of BODIPY-based photosensitizers,meanwhile getting rid of noble metals and decreasing the cost.The designed BODIPY-derived photosensitizers have tunable redox potentials,strong absorption in visible region and can be used under low light density effectively.Furthermore,efficient and clean photocatalytic removement of organic pollutant can be achieved in aqueous solutions.The results show that extending 2,6-diiodo-styryl-BODIPY at C-3,5 or C-8 can finely tune its photochemical and photophysical properties,redshifting its UV absorption,making strong absorption in long wave length region?600⁷00 nm?.The 2,6-diiodo-cyanstyrylBODIPY can remarkably sensitize ¹O₂ even in aqueous solution DMF/H₂O?5:1,v/v?,and the yield of ¹O₂ in aqueous solution is as high as 0.21.Consequently,the photooxidation of 1,5-Dihydroxynaphthalene?1,5-DHN?catalyzed by 2,6-diiodo-cyanstyryl-BODIPY can be conducted efficiently in aqueous solution.This paper will lay a solid theoretical foundation for photocatalytic application of BODIPY-derived photosensitizers,which makes the photo reaction more economically and environmentally friendly.In another aspect,the C-3,5 sites of BODIPY can significantly influence the grabing and releasing electron abilities of BODIPY.Conjugating electron donor at C-3 can enhance its Photoinduced Electron Transfer?PET?process,but conjugating electron accepter at C-8 simultaneously can contrarily weaken the enhanced PET process.This paper extended 2,6-diiodo-styryl-BODIPY at C-3 with diethylamino,and realizes the efficient photocatalytic conversion of 1,4-Dihydropyridine?1,4-DHP?based on the mechanism of O₂^·-in low light density and air atmosphere,meanwhile puts forwards ideas of ecofriendly and low-cost photocatalyzation.The reaction rate is obviously increased compared with previous studies,and the conversion rate is as high as 98% at 28 min.