The dependence of quinine fluorescence quenching on ionic strength

✍ Scribed by Bruce Verity; Stephen W. Bigger

• Publisher: John Wiley and Sons
• Year: 1996
• Tongue: English
• Weight: 386 KB
• Volume: 28
• Category: Article
• ISSN: 0538-8066
• DOI: 10.1002/(sici)1097-4601(1996)28:12<919::aid-kin9>3.0.co;2-q

✦ Synopsis

The Stern-Volmer constant for the quenching of quinine fluorescence by chloride ions has been found to be markedly dependent on acid concentration Steady-state and time-resolved fluorescence measurements under different acid and salt concentrations have Further shown that the decrease in quenching arises from the influence of increasing ionic strength on the diffusion-controlled rate constant For the bimolecular quenching process nhro possible mechanisms for this dependence are discussed a decrease in the intrinsic rate constant for the reaction due to the kinetic salt effect, and a decrease in the effective encounter distance due to screening of the charges on the reactants 0 1996 john