Photostabilizing effects of singlet oxygen quenchers on long chain cyanine dyes

The total rate constants of the reaction of six antioxidants with singlet oxygen were measuredby fluorospectroscopy,and the effects of these antioxidants on the photostability of the dyes were alsoinvestigated kinetically.The results reveal that the six antioxidants are the effective quenchers of singlet oxygen（1O2）and can increase the photostability of the dyes.The power of metal chelates to quench 1O2 is thestrongest,and the chelates show the most effects on the photostability of the dyes.The photostability of thedyes has something to do with the relative amount of the antioxidant used.