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Thermolysis of disubstituted lithium and sodium orthoperiodates

  • Synthesis and Properties of Inorganic Compounds
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Abstract

Na2H3IO6 decomposes with water and oxygen evolution in the range of 180–250°C under the atmospheric pressure or in a dynamic vacuum. The solid residue is an equimolar mixture of NaIO3 and Na3IO5. Na3IO5 likely occurs in the form of the dimer Na6I2O10. An intermediate thermolysis stage is the elimination of a water molecule from the salt molecule with simultaneous disproportionation of the salt to trisubstituted orthoperiodate and metaperiodate: Na2H3IO6 = 0.5Na3H2IO6 + 0.5NaIO4 + H2O. Li2H3IO6 thermolysis under the atmospheric pressure proceeds in the same way; however in vacuum, the thermolysis yields LiIO3 and Li5IO6 in the ratio of 3: 1 (mol/mol). The reason for the different thermolysis routes lies in the different stability of the intermediates M3H2IO6 and MIO4.

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Authors and Affiliations

  1. Institute of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432, Russia

    N. I. Nikitina & Z. K. Nikitina

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  1. N. I. Nikitina
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  2. Z. K. Nikitina
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Original Russian Text © N.I. Nikitina, Z.K. Nikitina, 2007, published in Zhurnal Neorganicheskoi Khimii, 2007, Vol. 52, No. 4, pp. 535–541.

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Nikitina, N.I., Nikitina, Z.K. Thermolysis of disubstituted lithium and sodium orthoperiodates. Russ. J. Inorg. Chem. 52, 479–485 (2007). https://doi.org/10.1134/S0036023607040031

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  • DOI: https://doi.org/10.1134/S0036023607040031

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