TY - JOUR
T1 - Salt effect on transient proton transfer to solvent and microscopic proton mobility
AU - Agmon, Noam
AU - Goldberg, Sinay Y.
AU - Huppert, Dan
N1 - Funding Information:
Acknowledgements. We thank C. A. Chatzidimitriou-Dreismann, G. Markovich and E. Pines for discussions and comments. The research in Jerusalem was supported in part by The Israel Science Foundation (grant 139/94) administered by The Israel Academy of Science and Humanities. D.H. wishes to thank the German-Israeli James Franck Program for Laser-Matter Interactions.
PY - 1995/8
Y1 - 1995/8
N2 - The effect of an inert salt on the time-resolved fluorescence from excited hydroxypyrene-trisulfonate is measured and compared quantitatively to the solution of the transient Smoluchowski equation for proton diffusion-reversible recombination in the excited-state. The data in water can be explained by the screening and mobility-diminishing effects of the added salt. In methanol-water mixtures we observe additionally an enhancement of proton dissociation. The microscopic mechanism for proton mobility in water and methanolic mixtures is discussed. Since the rate-limiting step for proton mobility is a hydrogen-bond cleavage, percolation properties of the hydrogen-bond network might lead to a discontinuous drop in proton mobility, possibly reflected in our data.
AB - The effect of an inert salt on the time-resolved fluorescence from excited hydroxypyrene-trisulfonate is measured and compared quantitatively to the solution of the transient Smoluchowski equation for proton diffusion-reversible recombination in the excited-state. The data in water can be explained by the screening and mobility-diminishing effects of the added salt. In methanol-water mixtures we observe additionally an enhancement of proton dissociation. The microscopic mechanism for proton mobility in water and methanolic mixtures is discussed. Since the rate-limiting step for proton mobility is a hydrogen-bond cleavage, percolation properties of the hydrogen-bond network might lead to a discontinuous drop in proton mobility, possibly reflected in our data.
UR - http://www.scopus.com/inward/record.url?scp=0000571666&partnerID=8YFLogxK
U2 - 10.1016/0167-7322(95)92828-Y
DO - 10.1016/0167-7322(95)92828-Y
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AN - SCOPUS:0000571666
SN - 0167-7322
VL - 64
SP - 161
EP - 195
JO - Journal of Molecular Liquids
JF - Journal of Molecular Liquids
IS - 1-2
ER -