The Synthesis Of Benzimidazole Complexes And The Application On Fluorescent Fiber And Catalytic Polymerization

Benzimidazole and its derivatives have attracted a great attention in recent years due not only to their biological activities, but also their strong coordination abilities as multidentate ligands and their metal complexes having a broad scope of properties. By varying the substituents on the benzimidazole rings, their structures, photophysical and photochemical properties can be tuned. Due to their wide range of pharmacological activity, industrial and synthetic applications, a number of methods have been reported for the synthesis of benzimidazoles. They are also used as ?uorescent ligands and as components in organic light-emitting diodes (OLED) and in organic ?eld effect transistors (FET). Some of these compounds also display interesting photophysical and ?uorescent properties. However, as a class of compounds their spectroscopic properties have remained largely unexplored perhaps as a consequence of the lack of general synthetic methods to this class of heterocycle from easily accessible precursors.In view of this fact, our earlier work was concerned with the synthesis of new benzimidazole derivatives. Previously, we reported a novel and ef?cient tandem reaction for the synthesis of new benzimidazole derivatives. As far as we know, there were few published works regarding the optical properties of 8-(1-R2-~1H-benzo[d]imidazol-2-yl)-R1-q- uinoline. And, these ligands exhibiting fluorescent emission have rarely reported up to date. In addition, benzodimidazole and its derivatives were seldom studied. This prompted us to study the photophysical properties of this kind of compounds in detail. These ligands are characterized using different physico-chemical techniques such as elemental analyses (C, H, N, S and metal content), FT-IR, H NMR, crystal structure and spectroscopic properties. Our work makes readers conveniently understand the structure–property correlation of this molecule. A study on synthesis, characterization, and catalytic application of a zinc (Ⅱ) complex bearing a quinoline-based benzimidazole ligand also has been done.This paper mainly researched about the synthesis of fluorescent fiber and the catalyst of biodegradable polyesters. The PLA fluorescenct nanofibers which added compounds 8-(1-R~2-~1H-benzo[d]imidazol-2-yl)-R~1-quinoline were synthesized by electrostatic spinning. And the PP fluorescent fibers which added zinc (Ⅱ) complex were synthesized by melting spinning. In addition, the zinc (Ⅱ) complex was used as the catalyst in the polymerization of acrylic acid and styrene. These compounds are characterized using different physico-chemical techniques such as FS, SEM, DSC, TG, GPC and fluorescent electronic microscope and so on.