Abstract :
In this article, results based on the research of
optical properties of A2MX4 type crystals (A—organic
cation, M—metal, X—halogen) composed of different
chemical elements are presented. These crystals were
grown by the evaporation method from water solutions of
AX and MX2 compounds in an appropriate molar ratio.
The conducted X-ray investigations show a different
crystal structures, ranging from tetragonal to triclinic ones.
Also, the structure of the ion complex for Cu2+ crystals
varied. The investigation showed both CuCl4
2– tetrahedral
and CuCl4 2H2O2– octahedral deformed complexes in
investigated crystals. Additionally, the optical spectra of
the samples were measured in the range of 250–850 nm.
Based on the crystal field theory, it was shown that the
shape of absorption spectra and colour of the crystals
depend on the distortion of these complexes.
