Photochemistry of "Super" Photoacids. 2. Excited-State Proton Transfer in Methanol/Water Mixtures

  • Solntsev K
  • Huppert D
  • Agmon N
 et al. 
  • 26


    Mendeley users who have this article in their library.
  • 119


    Citations of this article.


Excited-state proton transfer to solvent (PTTS) of 5-cyano-2-naphthol was investigated in methanol/water mixtures. We have found that the time-resolved fluorescence data fit the solution of the Debye?Smoluchowski equation for the reversible geminate recombination of ions over the whole range of methanol/water concentration ratios. The rate constants of the elementary protolytic photochemical processes and their isotope effects were determined by a simultaneous analysis of the time-resolved fluorescence of the photoacid and its conjugated anion. The competition between adiabatic protonation and quenching of the excited naphtholate anion by the geminate proton was observed to diminish sharply near pure methanol. The dissociation rate coefficient near pure methanol depends on a power of the water concentration, which appears to decrease from 2 (for ?ordinary? photoacids) to below 1 for ?super? photoacids.

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document


  • Kyril M. Solntsev

  • Dan Huppert

  • Noam Agmon

  • Laren M. Tolbert

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free