A blue chemiluminescence in the reaction of umbelliferone with hypochlorite
Copyright policy )A blue chemiluminescence in the reaction of umbelliferone with hypochlorite
AbstractA strongly fluorescing 7‐hydroxycoumarin (umbelliferone, U) oxidized in dilute (10 μmol/L‐0, 1 mol/L) aqueous solution with CIO− or CIO− + H2O2 (but not with H2O2 alone) produces a strong chemiluminescence (CL). Light emission kinetics depends on the pH of solution (4.0–10.5) and the reaction has a low activation energy Ea = 31 ± 2 kJ/mol (285–310 K). The spectrum covers the fluorescence of umbelliferone (400–550 nm, λmax 460nm). No red emission typical of 1Δg, 1Σ+g (O2)2 is observed either in the umbelliferone +CIO− or the umbelliferone +CIO− + H2O2 solution. The possible mechanism of CL and concomitant degradative oxidation of umbelliferone is discussed.
Kinetics, Luminescent Measurements, Thermodynamics, Umbelliferones, Hydrogen-Ion Concentration, Plants, Oxidation-Reduction, Hypochlorous Acid
Kinetics, Luminescent Measurements, Thermodynamics, Umbelliferones, Hydrogen-Ion Concentration, Plants, Oxidation-Reduction, Hypochlorous Acid
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