Letter | Published:

A Photochemical Antagonism of Radiations

Nature volume 139, page 285 (13 February 1937) | Download Citation



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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  1. 1.

    , Z. phys. Chem., A, 169, 1–19 (1934); 175, 99–126 (1935).

  2. 2.

    , NATURE, 136, 794 (1935). , and , NATURE, 137, 71 (1936) ; Z. phys. Chem., B, 32, 135 (1936).

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  1. Chemical Institute, University, Lund.

    • G. HOLST


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