5-Nitro-1,10-phenanthroline

66-71-7

4199-88-6

General procedure for the synthesis of 5-nitro-1,10-o-phenanthroline from 1,10-phenanthroline: 1,10-phenanthroline (10 g, 55.49 mmol) was slowly added to fuming nitric acid (10 ml), which was subsequently dissolved in concentrated sulfuric acid (20 ml). The reaction was stirred at 160°C for 3 hours. After completion of the reaction, the reaction mixture was diluted with ice water and the pH was adjusted with saturated aqueous sodium hydroxide solution to 3. The resulting yellow solid was collected by filtration, washed with water and finally concentrated under reduced pressure to give 5-nitro-1,10-phenanthroline (6.2 g, 99% yield).