Efficient synthesis of 1-R₁-2-R-4,5-di(furan-2-yl)-1H-imidazoles and their luminescence properties

In this study, a series of 1-R₁-2-R-4,5-di(furan-2-yl)-1H- imidazole derivatives were synthesized in better yield 59.0%∼89.8% by the treatment of purified imidazole compounds with benzyl chloride or allyl chloride in the presence of sodium hydride, and were characterized by FT-IR, HRMS, ¹H NMR and ¹³C NMR spectroscopy. Furthermore, the luminescence properties of the synthesized products were investigated. It was found that N-substituted groups of imidazole have little influence on the absorption bands in a 0.1 N H₂SO₄ aqueous solution containing 0.5 mL of dissolved CH₃OH. However, the emission of some compounds in solution was sensitive to the polarity of the solvents.