Source of materialAll reagents and solvents were used as obtained without further purification. Copper(II) dichloride (134.5 mg, 1m mol), 3,5-dibromo-2-hydroxybenzaldehyde (559.8 mg, 2mmol) and N,Ndimethylethane-1,2-diamine were dissolved in methanol (15 mL) and mixed together. The mixture was refluxd for 8hand filtered after cooling to room temperature. The filtrate was kept still in air for one week. Large block-shaped crystals were precipitated. They were filtered and washed with ethanol and dried in avacuum desiccator using anhydrous CaCl 2 (yield 71 %). Experimental detailsH2A and H4A atoms bound to nitrogen atoms were found in the difference Fourier map and refined. The other hydrogen atoms were positioned geometrically with d(C-H) =0.93 -0.97 Å,and treated as riding with U iso (H) =1.2 or 1.5 U eq (C), respectively.

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