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 CuCl 4 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.
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