*The quenching of tryptophan fluorescence by dissolved O 2 gas was monitored by

Question

*The quenching of tryptophan fluorescence by dissolved O2 gas was monitored by measuring emission lifetimes at 348 nm in aqueous solution. Determine the quenching rate constant for this process from the following data.

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When benzophenone is illuminated with ultraviolet light, it is excited into a singlet state. This singlet changes rapidly into a triplet, which phosphoresces. Triethylamine acts as a quencher for the triplet. In an experiment in methanol as solvent, the     phosphoresces intensity varied with amine concentration as shown below. A time-resolved laser spectroscopy experiment had also shown that the half-life of the fluorescence in the absence of quencher is 29s. What is the value of KQ?

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