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The Quenching of Singlet Oxygen (<sup>1</sup>Δ<sub>g</sub>) by Transition Metal Chelates
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1974
Year
Chemical KineticsEngineeringInorganic PhotochemistryChemistryElectronic Excited StateChemical EngineeringSinglet OxygenPhotophysical PropertyO 2Inorganic ChemistryPhysicsPhotochemistryLiquid PhaseChemisorptionPhysical ChemistryQuantum ChemistryExcited State PropertyNatural SciencesChemical ThermodynamicsRate Constants
Various transition metal chelates were found to quench 1 O 2 in the liquid phase. 1 O 2 was generated either photochemically, from an ozonide, or with a microwave source and reacted with rubrene or 3-methyl-2-pentene. Rate constants for 1 O 2 quenching by the chelates were measured in various solvents using the three 1 O 2 sources, and compared with the constants of previously known 1 O 2 quenchers. The most efficient chelates quenched 1 O 2 at close to the diffusion controlled rate, as did β-carotene. Some quenchers of 1 O 2 in the liquid phase were qualitatively shown to quench in the solid state. The possible 1 O 2 quenching mechanisms of the chelates are discussed.