Photo-Oxidation of Pyrrhole


FRESHLY redistilled pyrrole dissolved in water, alcohol or acetone and mixed with 0.5 × 10-1 M methylene blue rapidly takes up oxygen in the light but not in the dark. Pyrrole alone is not oxidized. The rate of oxygen uptake is a linear function of light intensity. Eosin, but not fluorescein, can be used instead of methyleno blue. Tests with standard optical filters showed the effective wave-lengths to be within, the range of 5200–5800 A. On the basis of 5500 A., the energy necessary to institute the reactionis 3.4 × 10-12 ergs/molecule.

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BERNHEIM, F., MORGAN, J. Photo-Oxidation of Pyrrhole. Nature 144, 290 (1939).

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