The title compounds were prepared and their solubility in water at 295 K (10(-2) -10(-1) mol/dm sześc.) the IR spectra and X-ray diffractograms complexes were recorded, and their thermal decomposition in air was investigated. During heating the hydrated complexes (Co, Ni, Cd) lose crystalization water molecules in one step and the anhydrous compounds decompose to oxides (Co, Ni, Zn: 5 and 10 K/min and Cu: 5 K/min heating rate) or to gaseouns products (Cu: 10 K/min, Cd: 5 and 10 K/min heating rate).