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Abstract
The influenoe of cation substitution (A = N(CH3)+ 4, NH(CH3)+ 3, NH2(CH3)+ 2) on phase transitions in A2CuCl4 crystals have been studied using Raman spectroscopy and optioal methods. Suoh a substitution leads to the considerable shift of the lattice vibration bands due to the change of oation mass. The hydrogen bonds oocuring in [NH2(CH3)2]2CuCl4 and [NH(CH3)3] 2 CuCl4 manifest themselves in the distortion of CuCl2 4 322 complexes. Two modifications of latter crystals, in particular, are distinguished by different symmetry of the anion.