Letter | Published:

Colour of Solutions of Iodine in Oleum

Naturevolume 193page678 (1962) | Download Citation



THE blue colour which appears when iodine reacts with oleum has been discussed in terms of the formation of the iodine cation, I+ (refs. 1, 2). Recently3, evidence purporting to show that iodine cations are not formed by oxidation in this medium and that the blue colour is due to an ‘inclusion’ compound of molecular iodine and ‘polysulphuric’ acid has been put forward. We wish to reconsider this conclusion.

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  1. 1

    Symons, J. Chem. Soc., 387, 2186 (1957).

  2. 2

    Arotsky, Mishra and Symons, J. Chem. Soc., 12 (1961).

  3. 3

    Mokhnach, Andreev, Stroganov, Komarov and Zhdanov, Dok. Akad. Nauk, SSSR., 130, 768 (1960); see also abstract in Angew. Chem. (sample English ed.), 87 (May 1961).

  4. 4

    Brand, J. Chem. Soc., 585 (1946).

  5. 5

    Walrafen and Young, Trans. Farad. Soc., 56, 1419 (1960).

  6. 6

    Symons, J. Chem. Soc., 2440 (1957).

  7. 7

    Arotsky and Symons, Trans. Farad. Soc., 56, 1426 (1960).

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  1. The Harris College, Preston

    • J. AROTSKY
  2. Department of Chemistry, The University, Leicester

    • M. C. R. SYMONS


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