Three coordination compounds with urea ligands, namely , , and were investigated. In the temperature range of 130-320 K only the first two aforementioned complexes undergo one solid phase transition at: = 298.4 K and = 255.4 K (on heating), respectively. X-ray single crystal diffraction at 293 K demonstrates that crystallises in the trigonal crystal system (R-3c space group) and is isostructural with the other two title compounds. Both the anions and ligands are in the high temperature phase dynamically disordered. , and are thermally stable up to 500, 470 and 440 K, respectively, in argon atmosphere. decompose explosively at ca. 550 K. decomposes in three main stages with creation of as a final product of decomposition at 1250 K. Whereas decomposes in two main stages. The mixture of Cr, and ClCrNH is created at 1270 K as a product of decomposition.