Three types of copper derivatives formed by CuCl<sub>2</sub>·2H<sub>2</sub>O interaction with (<i>Z</i>)-3-aryl-2-(methylthio)-5-(pyridine-2-ylmethylene)-3,5-dihydro-4<i>H</i>-imidazol-4-ones
presence of a reducing solvent (alcohol or dimethylformamide (DMF)) produce three types of Cu-containing compounds: two Cu complexes with a composition of CuII(3)Cl2 (4) and CuI(3)Cl (5) as well as a salt (3 + H)+CuICl2− (6) in a 4 : 5 : 6 ratio depending on the substituent at the N(3) nitrogen atom of the ligand moiety. In non-reducing solvents (dimethylsulfoxide (DMSO) and CHCl3/acetone), only complexes