Source of material 3,5-Dibromosalicylaldehyde (560 mg,2m mol) and isopropylamine (118 mg, 2m mol) were dissolved in methanol (25 mL). The mixture was stirred at room temperature for 2htogive aclear yellow solution, which was added to amethanol solution (10 mL) of Zn(NO 3 ) 2 × 6H 2 O(595 mg, 2mmol
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