10.1016/j.tetlet.2010.02.027
The research explores the synthesis and photo-physical properties of new methoxy-substituted p-conjugated 2,20-bipyridines, which are nitrogen-containing organo-materials with applications in materials chemistry. The purpose of this study is to develop highly emissive materials in the visible region at room temperature, which could be potential ligands for metal coordination and have applications in light-emitting devices. The researchers used the Horner–Wordsworth–Emmons reaction to synthesize three new highly conjugated 2,20-bipyridines (3a–c). Key chemicals involved in the synthesis include 4,4-bis-chloromethyl-2,2-bipyridine (1a), lithium diisopropylamide (LDA), chlorotrimethylsilane, hexachloroethane, cesium fluoride, tetraethyl-2,2-bipyridine-4,4-diylbis(methylene)diphosphonate (2), and various methoxy-substituted benzaldehydes (6a–c). The synthesized compounds (3a–c) were characterized by NMR spectroscopy, elemental analysis, and LC–MS. The study found that these compounds exhibit strong emission in the visible region with quantum yields of 0.59, 0.70, and 0.73 for 3a, 3b, and 3c, respectively. The research concludes that the synthesized bipyridines show excellent emissive properties and potential for use in light-emitting devices, with further investigations ongoing in the laboratory.