Production
Various methods for the production of singlet oxygen exists. A photochemical chemical method involves the irradiation of normal oxygen gas in the presence of an organic dye as a sensitizer, such as rose bengal, methylene blue or porphyrins. Singlet oxygen can also be produced chemically. One of the chemical methods is by the decomposition of hydrogen trioxide, or to react hydrogen peroxide with sodium hypochlorite, which is convenient in school laboratories for demonstrative purposes:
- H2O2 + NaOCl → O2(1Δg) + NaCl + H2O
Another method is via phosphite ozonides, which in turn is generated in situ. The phosphite ozonide is then catalytically decomposed by pyridine at low temperature to give singlet oxygen:
The advantage of this method is that the reaction can be cyclic, which the resulting phosphate ester is reduced to the phosphite ester for further production of singlet oxygen.
Read more about this topic: Singlet Oxygen
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