The thermal decomposition of ammonium chloride tetrachlorozincate and the formation of tetrachlorozincate complexes of alkali metal by means of solid reactions with alkali chlorides.

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概要

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• Ammonium chloride tetrachlorozincate, (NH<SUB>4</SUB>)<SUB>3</SUB>Cl[ZnCl<SUB>4</SUB>], decomposes to ZnCl<SUB>2</SUB> in two stages through an intermediate phase (NH<SUB>4</SUB>)<SUB>2</SUB>[ZnCl<SUB>4</SUB>]. In the first stage, 1 mol of NH<SUB>4</SUB>Cl is lost by one-dimensional diffusion mechanisms with the activation energy of 138 kJ mol<SUP>−1</SUP>, and in the second stage the release of two moles of NH<SUB>4</SUB>Cl is controlled by a random nucleation reaction with the activation energy of 126 kJ mol<SUP>−1</SUP>, corresponding to the bondbreaking. Anhydrous alkali metal tetrachlorozincate complexes, M<SUB>2</SUB>[ZnCl<SUB>4</SUB>](M=Na, K, Rb, Cs), are obtained by solid reactions with alkali chlorides when (NH<SUB>4</SUB>)<SUB>3</SUB>Cl[ZnCl<SUB>4</SUB>] decomposes. A dry chemical method using (NH<SUB>4</SUB>)<SUB>3</SUB>Cl[ZnCl<SUB>4</SUB>] as a starting material is proposed for the preparation of the anhydrous chlorozincate complexes, which have thus far been difficult to synthesize.

• 公益社団法人 日本化学会の論文

著者

• Oshima Satoshi

  Department Of Medicine The Japan Self Defense Forces Central Hospital

• TANAKA Haruhiko

  Faculty of School Education, Hiroshima University

• Tanaka Haruhiko

  Faculty Of School Education Hiroshima University

• Negita Hisao

  Department Of Chemistry Faculty Of Science Hiroshima University

• Ichiba Sumio

  Department of Chemistry, Faculty of Science, Hiroshima University

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