REINVESTIGATION OF SOLVENT CATALYZED GROUND-STATE REVERSE PROTON-TRANSFER IN 7-HYDROXYQUINOLINE

The dynamics of the ground-state reverse proton transfer of 7-hydroxyq uinoline have been reinvestigated in various alcohol solvents by pulse pump-cw probe transient absorption in combination with two-step laser -induced fluorescence measurements. The results show a nearly temperat ure-independent kinetic isotope effect for the reverse proton transfer in the ground state, consistent with the previous study. The overall proton transfer dynamics can be rationalized based on a kinetic deriva tion incorporating solvent reorganization forming a specific cyclic so lvent/solute complex, and then the dissociation and actual proton tran sfer of this hydrogen bonded complex.