*Method 1: Di*ff*usion*

To a solution of CuCl2·2H2O (0.25 mmol) in CH3CN (10 mL) in a test-tube was slowly added a solution of ligand (0.25 mmol) in CH3CN (10 mL). Blue single crystals of **1** mixed with some colorless crystals of ligand were obtained after two days. Yield: 84%.
