The solid-solid phase transitions of [C11H23NH3]2ZnCl4 complex were studied by Raman spectroscopy. The occurrence of the structural phase transitions are mainly related to the change of packing structure and mol. conformation of chains. The phase at Tcl = 25?is due to the change of packing state and conformation of chains from order to partial disorder. In the intermediate temperature phase, the chains contain partial gauche isomers. The phase transition at Tc2 = 87?arises from formation of total disorder of the alkyl chains. The high temperature phase leads to a "chain melting".

Key words: ZINC COMPLEX, CRYSTAL STRUCTURE, PHASE TRANSFORMATION, CONFORMATION, RAMAN SPECTROMETRY