Photo-dissociation dynamics of bis(p-dimethylaminophenyl) disulfide in ionic liquids studied by ultrafast transient absorption spectroscopy

► Photo-dissociation reaction of bis(p-dimethylaminophenyl) disulfide in ionic liquids was investigated. ► Significant cage effect for the geminate recombination was found in ionic liquids. ► A large solvation dynamics was found for the radical just after the photo-dissociation in ionic liquids.