Fluorescence quenching by the stable free radical di-t-butylnitroxide
- 1 April 1973
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 58 (7) , 2690-2695
- https://doi.org/10.1063/1.1679569
Abstract
Bimolecular rate constants (kQ) were measured for the fluorescence quenching of a series of aromatic hydrocarbons by di‐t‐butylnitroxide (DTBN). In methylcyclohexane, measured values of kQ were close to the diffusion limit with only a 6.5‐fold variation through the hydrocarbon series. A study of the viscosity dependence of the quenching reaction, in the Smoluchowski manner, suggests an interaction distance of 4–6 Å. A comparison is made of the efficiency of the DTBN and O2 fluorescence quenching reactions. Possible mechanisms are discussed.Keywords
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