Supramolecular Gel Based On Functionalized Benzimidazole Derivatives

This paper includes five chapters:Chapter One:The developments and applications of supramolecular gels in recent years have been introduced in this chapter, which include two aspects: supramolecular organogels and supramolecular metallogels. Through which, the issue of the present study is also put forward.Chapter Two:A gelator C11 has been designed and synthesized based on benzimidazole derivative. We also studied its formation process of supramolecular gel. It was found that C11 can form an organogel C11-OG and metallogels. In this chapter, we mainly introduced two metallogels, Ag-MG and Pb-MG. Besides, both of the organogel (C11-OG) and metallogel (M-MG) both have dramatic aggregation-induced fluorescence emission enhancement (AIEE). Organogel (C11-OG) and metallogel (M-MG) can be found in several mixed solvents like ethanol-water, methanol-water, interestingly the concentrations of metallogel Pb-MG is as low as 0.3wt%. It suggests that these gels have good gelation abilities. We also look into the mechanism of gelation. The result proves that Ag-MG and Pb-MG showed a good stimuli-responsive to Na2S and EDTA. Therefore, these metallogels can be used as a kind of new supramolecular soft material.Chapter Three:A low molecular weight gelator XJ was synthesized and we also delected its formation process of supramolecular gel. The organic gel's forming performance in various solvents and the ability to coordinate with metals to form metallogels, especially with Fe3+, and the microstructures of organogel and metallogels. Fluorescence properties of Fe3+ -contained metallogel were also tested. It is found that the organogel may be used as a soft material in the detection and identification of Fe3+ in state of gel. While the detection and identification of Fe3+ was measured. It is found that the detection limit reaches the 1×10-5M.Chapter Four:A novel organic gelator XZ has been synthesized via a simple and quick way. The gelator XZ can form organogel only when using glycol as solvent. The experiment proves that the organogel has a yellow aggregation-induced fluorescence. When adding some common ions into the organogel, different fluorescence changes appear. These results show that the organogel fluorescence quenched when adding Fe3+. Furthermore, the quenched fluorescence caused by Fe3+ could be reset upon the addtiong of H2PO4-. Therefore, the oraganogel can be used as a kind of material to identify different ions continually.Chapter Five:The expectation of our works.