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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—George Bluestone, U.S. educator, critic. “The Limits of the Novel and the Limits of the Film,” Novels Into Film, Johns Hopkins Press (1957)
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—Albert Camus (1913–1960)
“It is part of the educator’s responsibility to see equally to two things: First, that the problem grows out of the conditions of the experience being had in the present, and that it is within the range of the capacity of students; and, secondly, that it is such that it arouses in the learner an active quest for information and for production of new ideas. The new facts and new ideas thus obtained become the ground for further experiences in which new problems are presented.”
—John Dewey (1859–1952)