Synthesis And Properties Of Rare Earth Europium Complexes Based On 1,10-o-phenanthrene Derivatives Ligands

Rare earth complexes were widely applied in the fields of fluorescent probes,cell imaging,fluorescent sensors,hybrid materials,ion exchange,molecular recognition,and clinical medicine,bearing unique luminescence properties due to the 4f electronic structure,transition form and biological activity of rare earth ions.Among the various ligands,1,10-o-phenanthrene has become the preferred ligand for many researchers because of its unique structure and special coordination ability.1,10-o-Phenanthrene is composed of three rigid planar six-member rings,and there are two nitrogen atoms with lone pair electrons in the sag,which can coordinate with metal ions to form a relatively stable chelating ring structure.1,10-o-Phenanthrene derivatives have delocalized electron-conjugated systems,bearing different characteristics by introducing different functional groups.In this paper,four new rare earth europium complexes based on 1,10-o-phenanthrene derivatives were designed and synthesized,and their absorption spectra,emission spectra,cell imaging,ion recognition and applications in water samples were systematically tested.The main research contents of this paper are described below:In the first chapter,the research background,luminescence mechanism,fluorescence properties,evaluation parameters and the applications in various aspects of rare earth complexes were introduced.Then the main research contents were put forward based on these results.In the second chapter,the rare earth europium complexes 1a and 1b were designed and synthesized by introducing the electron-donating group?methoxyl?and electron-absorbing group?nitro?to modify 1,10-o-phenanthrene,and the single crystals of 1a and 1b were obtained.The fluorescence intensities,fluorescence lifetimes and fluorescence quantum yields of 1b were all higher than these of 1a through comparative study.In addition,complexes 1a and 1b can be used in cell imaging to achieve fluorescence emission in Hela living cells.In the third chapter,the rare earth europium complex 2a based on 1,10-o-phenanthrene derivative ligand was synthesized.The fluorescence performance of complex 2a in methanol solvent was studied.It can selectively identify Al³⁺and Zn²⁺and it can be used as a fluorescence sensor to recognize Al³⁺and Zn²⁺.In the process of detecting Al³⁺and Zn²⁺,not only did the emission peak shift,but also the color of the solution changed obviously,which could be recognized by"naked eye".In the fourth chapter,a multi-response sensor 3a was designed and synthesized.The fluorescence response to Sn²⁺and Cu²⁺of the complex 3a in deionized water:the fluorescence color of the solution changed from red to bright ivory when Sn²⁺was added,and the fluorescence color of the solution faded when Cu²⁺was added.In addition,the complex 3a was used to detect Sn²⁺and Cu²⁺in real samples.