Indication of a very large proton diffusion in ice I(h). III. Fluorescence quenching of 1-naphthol derivatives.
The effects of excess protons on the fluorescence quenching process of 1-naphthol-4-sulfonate (1N4S) and 1-naphthol-3-sulfonate (1N3S) in methanol-doped ice samples were studied by employing a time-resolved emission technique. We found that the fluorescence quenching of the deprotonated form RO(-)* of both photoacids by protonation is very efficient in ice, whereas in liquid water the proton fluorescence quenching is rather small. Using the Smoluchowski diffusion-assisted binary collision model under certain assumptions and approximations, we found that the calculated proton diffusion constant in ice in the temperature range of 240-260 K was 10 times greater than that of water at 295 K.
Uritski
Anna
A
Raymond and Beverly Sackler Faculty of Exact Sciences, School of Chemistry, Tel Aviv University, Tel Aviv 69978, Israel.
Presiado
Itay
I
Huppert
Dan
D
D004058:Diffusion; D005415:Flavins / Q000737:chemistry; D005453:Fluorescence; D006851:Hydrochloric Acid / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007053:Ice; D000432:Methanol / Q000737:chemistry; D009281:Naphthalenes / Q000737:chemistry*; D010782:Photolysis; D011522:Protons; D013451:Sulfonic Acids / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors
C504546:1-naphthol-4-sulfonate; D005415:Flavins; D007053:Ice; D009281:Naphthalenes; D011522:Protons; D013451:Sulfonic Acids; D006851:Hydrochloric Acid; D000432:Methanol