Cyclooctatetraene(COT)attachment to fluorophores(“self-healing”dyes)is known for quenching reac-tive triplet states via triplet-state energy transfer(TET),enhancing photostability.However,COT’s impact on singlet st...Cyclooctatetraene(COT)attachment to fluorophores(“self-healing”dyes)is known for quenching reac-tive triplet states via triplet-state energy transfer(TET),enhancing photostability.However,COT’s impact on singlet states remains unclear.Quantum calculations reveal that COT induces energy transfer to dark states in deep blue dyes while promoting photoinduced electron transfer(PET)and intersystem crossing(ISC)in visible dyes,potentially compromising brightness and/or photostability.To address this,we pro-pose the use of △E descriptor to optimize COT’s effects.Our findings uncover COT’s multifaceted impact.These insights will guide the development of superior triplet state quenchers and photostable dyes.展开更多
The total rate constants of the reaction of six antioxidants with singlet oxygen were measured by fluorospectroscopy,and the effects of these antioxidants on the photostability of the dyes were also investigated kinet...The total rate constants of the reaction of six antioxidants with singlet oxygen were measured by fluorospectroscopy,and the effects of these antioxidants on the photostability of the dyes were also investigated kinetically.The results reveal that the six antioxidants are the effective quenchers of singlet oxygen (~1O_2)and can increase the photostability of the dyes.The power of metal chelates to quench ~1O_2 is the strongest,and the chelates show the most effects on the photostability of the dyes.The photostability of the dyes has something to do with the relative amount of the antioxidant used.展开更多
基金the support from the Ministry of EducationSingapore (MOE,No.MOET2EP10120-0007)+4 种基金A^(*)STAR under its Advanced Manufacturing and Engineering Program (No.A2083c0051)the SUTD Kickstarter Initiative (No.SKI 2021_01_01)supported by QMUL Research-IT for computational resources,and the ARCHER UK National Supercomputing Service (No.EP/X035859/1) via the Materials Chemistry Consortiumthe Molecular Modelling Hub for computational resources,MMM Hub,which is partially funded by EPSRC (No.EP/T022213/1)Leverhulme Trust (No.RPG-2019-122) for funding
文摘Cyclooctatetraene(COT)attachment to fluorophores(“self-healing”dyes)is known for quenching reac-tive triplet states via triplet-state energy transfer(TET),enhancing photostability.However,COT’s impact on singlet states remains unclear.Quantum calculations reveal that COT induces energy transfer to dark states in deep blue dyes while promoting photoinduced electron transfer(PET)and intersystem crossing(ISC)in visible dyes,potentially compromising brightness and/or photostability.To address this,we pro-pose the use of △E descriptor to optimize COT’s effects.Our findings uncover COT’s multifaceted impact.These insights will guide the development of superior triplet state quenchers and photostable dyes.
基金the National Natural Science Foundation of China
文摘The total rate constants of the reaction of six antioxidants with singlet oxygen were measured by fluorospectroscopy,and the effects of these antioxidants on the photostability of the dyes were also investigated kinetically.The results reveal that the six antioxidants are the effective quenchers of singlet oxygen (~1O_2)and can increase the photostability of the dyes.The power of metal chelates to quench ~1O_2 is the strongest,and the chelates show the most effects on the photostability of the dyes.The photostability of the dyes has something to do with the relative amount of the antioxidant used.
