Zinc nitrate hexahydrate (6.48 g, 6.1 mmol) and 1,4-benzenedicarboxylic acid (1.188 g, 2.0 mmol) were dissolved in 180 mL of N,N-dimethylformamide (DMF) in a 250 mL Schott bottle and stirred for 30 minutes. The reaction mixture was then heated in a convection oven at 120 °C for 24 hours. After heating, the mixture was allowed to cool to room temperature. The DMF was decanted, and 200 mL of fresh DMF was added to the solid. The bottle was stored in a fume hood for 24 hours and then filtered using No. 5 filter paper. Subsequently, 200 mL of chloroform was added to the bottle, and the mixture was stored for another 24 hours and again filtered. The resulting solid was dried in a vacuum oven at 60°C for 12 hours.