S. Ichiba, S. Oshima, H. Negita
Dec 1, 1980
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0
Influential Citations
1
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Journal
Bulletin of the Chemical Society of Japan
Abstract
Ammonium chloride tetrachlorozincate, (NH4)3Cl[ZnCl4], decomposes to ZnCl2 in two stages through an intermediate phase (NH4)2[ZnCl4]. In the first stage, 1 mol of NH4Cl is lost by one-dimensional diffusion mechanisms with the activation energy of 138 kJ mol−1, and in the second stage the release of two moles of NH4Cl is controlled by a random nucleation reaction with the activation energy of 126 kJ mol−1, corresponding to the bondbreaking. Anhydrous alkali metal tetrachlorozincate complexes, M2[ZnCl4](M=Na, K, Rb, Cs), are obtained by solid reactions with alkali chlorides when (NH4)3Cl[ZnCl4] decomposes. A dry chemical method using (NH4)3Cl[ZnCl4] as a starting material is proposed for the preparation of the anhydrous chlorozincate complexes, which have thus far been difficult to synthesize.