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• W2072382194 abstract "The paper describes a new method for the optical measurement of pH based on time-resolved luminescence. The intense line emission of a europium terpyridine chelate is strongly quenched by bromothymol blue (BTB). Since only the blue base form acts as a quencher, the decay time of the luminescence directly reflects the protonation state of BTB and, hence, the pH of the solution. The experimental results are in good agreement with a theoretical model that accommodates both the Henderson−Hasselbalch equation and the Stern−Volmer law. Decay time-based response curves have the same sigmoidal shape as conventional titration curves, but their apparent pKa is shifted to lower pH, depending on the total concentration of BTB used. All luminescence decay curves featured single-exponential decay. With 8 μmol/L BTB, decay times decreased from 1172 μs at pH 2.60 to 120 μs at pH 8.94, and the apparent pKa shifted from 7.0 to 6.1. A Stern−Volmer quenching constant of 9.55 × 105 was obtained for the base form of BTB. The method appears particularly useful as a transduction scheme for optical chemical sensors, since it makes conventional indicator dyes available to decay time-based sensing." @default.
• W2072382194 created "2016-06-24" @default.
• W2072382194 creator A5002202035 @default.
• W2072382194 date "1999-03-19" @default.
• W2072382194 modified "2023-09-27" @default.
• W2072382194 title "Probing the Dissociation State of Acid−Base Indicators by Time-Resolved Lanthanide Luminescence: A Convenient Transduction Scheme for Optical Chemical Sensors" @default.
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• W2072382194 doi "https://doi.org/10.1021/ac971313o" @default.
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