[Br:1][C:2]1[C:3]([NH2:10])=[C:4]([NH2:9])[C:5]([Br:8])=[CH:6][CH:7]=1.C(O)(=O)C.[C:15]1([C:21]([C:23]([C:25]2[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=2)=O)=O)[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1.C(=O)(O)[O-].[Na+]>O>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([Br:8])=[C:4]2[C:3]=1[N:10]=[C:21]([C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1)[C:23]([C:25]1[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=1)=[N:9]2Preparation procedure: 3,6-dibromo-o-phenylene diamine (1.0 g, 3.7 mmol) is added to an acetic acid (20 mL) solution of benzil (0.39 g, 1.84 mmol) at 120° C. The resulting solution is mixed homogeneously and reflux for 12 hours. The reaction solution is poured into water, neutralized with sodium bicarbonate, extracted with chloroform, washed with saturated brine water, and dried over anhydrous sodium sulfate. The solvents are removed using a rotary evaporator. The crude product is subjected to column chromatography to give a white solid, which is then recrystallized in chloroform/n-hexane to afford a white solid powder (yield 86%), MALDI-TOF-MS (m/z): 440.1 (M+).
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