Abstract
Mixed crystals of composition ( n-C m H 2 m+1 NH 3) 2 x m ( n-C n H 2 n+1 · NH 3) 2−2 x m ZnCl 4 ( m= 12; n=14, 16, 18) are formed upon annealing mechanical mixtures of layer compounds ( n-C n H 2 n+1 NH 3) 2ZnCl 4, through solid state diffusion of the n-alkylammonium cations. From a common high temperature monophasic modification, in which the polymethylenic chains are conformationally molten, different modifications are obtained on cooling [depending on the ( n − m) value] in which chain crystallinity is developed. The structure of such modifications is speculated on the grounds of DSC and preliminary X-ray diffractometric and IR data, and compared with that of similar previously characterized systems.
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