Synthesis And Aggregation Behavior Of Large Conjugated Groups Of Pyene

The fluorescence quantum yield of pyrene is high,and excimer's fluorescence bands are different from monomer,and its excitation spectrum is very sensitive to microenvironment changes.We decided to synthesize a series of hydrazine derivatives starting from pyrene,such as 1,3,6,8-tetraethynylpyrene,1-ethynylpyrene,1-vinylpyrene,and then the synthesized materials are characterized by 1HNMR,13CNMR,ESI-MS,etc.to strictly ensure the accuracy of the structure of the synthesized substance,and then optical properties of the composition in the research,the aggregation behavior of 1,3,6,8-tetraethynylpyrene in solution was studied by means of UV absorption spectroscopy and fluorescence spectroscopy.The multi-directional and multi-level exploration was carried out to demonstrate its aggregation behavior.The aggregation behavior in different solvents was studied.The effects of different ratios of two different solvents on their aggregation behavior were studied.The change of aggregation behavior with concentration was studied.The change of aggregation behavior with concentration was studied.Because the molecules are microscopic,it is difficult for the naked eye to directly observe what happens to the aggregation behavior,we use fluorescence emission spectroscopy,DLS,SEM and 1HNMR to achieve the purpose of the research.The photochemical reaction of 1-ethynylpyrene under the irradiation of light of specific wavelength was also studied.In order to study the photochemical reaction,the 1-ethynylpyrene solution and the 1-ethynylpyrene solid phase were tested for fluorescence before and after illumination.Fluorescence changes to speculate whether it has reacted and how it reacted.In order to verify our hypothesis,we not only performed 1HNMR,ESI-MS and other structural characterizations of 1-ethynylpyrene before and after the reaction,but also synthesized a model compound based on 1-ethynylpyrene's structure.The crystals grown by the model compound was characterized,and the most intuitive and powerful means to verify the photochemical reaction we studied.We also synthesized silver-NHC complexes widely used in molecular recognition,catalysis,drug delivery and sensing,and verified the structural accuracy by means of 1HNMR,13CNMR and ESI-MS.