ハロゲン化アルキルアンモニウムの変態

概要

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Transition behavior of alkylammonium halides was investigated by means of DTA, IR spectrum, X-ray diffraction, dielectric constant and microscopic observation. Dodecylammonium chloride (DAC) had three transition points A (45°C), B (58°C) and C (69°C). B and C were reversible, but A was not found on the first heating step.<BR>DAC seems to have the thermal behavior as follows. At the first transition point A, DAC dissociated into dodecylamine (DA) and free hydrochloride, and the complex is produced between DA and DAC at B. The crystal structure of this complex, which is monoclinic, changes into other structure at C.<BR>On the first heating step, the dissociation seems to be occurred at B. In the case of dodecyl-ammonium bromide and dodecylammonium iodide, A was already found on the first heating step.