Photochemical reaction, a chemical reaction initiated by the absorption of energy in the form of light. The consequence of molecules absorbing light is the creation of transient excited states whose physical and chemical differ greatly from the original molecules.
A photo oxygenation is a light-induced oxidation reaction in which molecular oxygen is incorporated into the product(s). Initial research interest in photo oxygenation reactions arose from Oscar Raabs observations in 1900 that the combination of light, oxygen and photosensitizers is highly toxic to cells. Early studies of photo oxygenation focused on oxidative damage to DNA and amino acids, but recent research has led to the application of photo oxygenation in organic synthesis and photodynamic therapy.
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