Abstract
Raman spectra, X-ray diffraction diagrams and differential scanning calorimetry show the existence of two structural phase transitions in crystalline (C 8H 17NH 3) 2 CdCl 4. The solid stable at low temperature is ordered, the alkylammonium chains are in extended configuration with probably a gauche bond in the proximity of the NH 3 group. The intermediate phase is characterized by a confonnational disorder and a modification of the crystalline structure. The number of internal rotations increases in the high temperature form; however the total transition entropy is lower than the value expected for a total “melting” of the chains.
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