Abstract
THE chemical action of light of different wavelengths on a thermal oxidation-reduction equilibrium of the following type: A + BH2 AH2 + B may, under certain conditions, in the absence of oxygen, lead to displacements in opposite directions. Suppose that the hydrogen acceptors A and B have each an absorption band in different parts of the visible spectral region, A absorbing mainly the longer waves ( 700-500 m) and B the shorter ones ( 500-400 m). Then light of longer waves may drive the equilibrium to the right and that of the shorter waves to the left. A good example of such an equilibrium in a liquid system is constituted of the two oxidation reduction systems: methylene blue (A)—leucomethylene blue (AH2) and phenylhydra-zine-sulphonate (BH2)—benzenediazosulphonate (B) in diluted acid solutions1.
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Holst, G., Z. phys. Chem., A, 169, 1–19 (1934); 175, 99–126 (1935).
Weiss, J., NATURE, 136, 794 (1935). Weiss, J., and Fischgold, H., NATURE, 137, 71 (1936) ; Z. phys. Chem., B, 32, 135 (1936).
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HOLST, G. A Photochemical Antagonism of Radiations. Nature 139, 285 (1937). https://doi.org/10.1038/139285a0
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DOI: https://doi.org/10.1038/139285a0
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