Synthesis And Properties Of Rare Earth (Eu,Tb) Octanoyl Amino Acid Compounds

Amino acids are basic structural units of proteins,enzymes,etc.,and are a kind of biological ligands that are non-toxic and polluting-free in the body.Since the rare earth elements were discovered in Sweden in 1788,they have been widely used in fluorescent materials,electric light source materials,permanent magnet materials,hydrogen storage materials,catalytic materials,magnetostrictive materials,and magnetic refrigeration materials and other aspects.The electronic structure and bonding characteristics of rare earth ions(Eu³⁺,Tb³⁺,etc.)make them have the advantages of high coordination number and changeable combination.Therefore,rare earth ions with low luminous efficiency can show the Antenna effect after combining with the organic ligands of amino acids with high light absorption coefficient to form rare earth complexes.It shows that the Antenna effect can change the biological effects and long-term effects of rare earth ions and amino acids in body,and can also significantly enhance the optical,electrical,and magnetic properties of rare earth complexes.In recent years,the study of rare earth and transition metal amino acid complexes has always been paid attention to,especially in the past ten years.Taking rare earth amino acid complexes as an example,there are currently 13 kinds of amino acids such as glycine,alanine,serine,threonine,aspartic acid,glutamic acid and proline,which can combine with rare earth ions to form a variety of rare earth amino acid complexes.Rare earth amino acid complexes have attracted much attention in many research fields and are widely used.Therefore,on the basis of these studies,a series of new octanoyl amino acid ligands and rare earth octanoyl amino acid complexes are taken as the main research objects in this paper,and the functional characteristics of different types of ligands are explored,and it is further clarified that rare earth octanoyl amino acid complexes show different functional characteristics due to different functional groups.This article is mainly divided into four chapters.?1?The first chapter is mainly a review of literature reports about amino acid series rare earth complexes.?2?In the second chapter,based on previous functional oriented design concepts,octanoylalanine?H?oct-ala??,octanoylphenylalanine?H?oct-phe??,and octanoylserine?H?oct-ser??were prepared by a chemical reaction method in solution.The effects of different functional groups on the structure and functional properties of the compounds were investigated by using nuclear magnetic resonance,infrared spectrometer,XRD,DSC,scanning electron microscope,polarizing microscope and other instruments.It is found that octanoylphenylalanine is a kind of compound with good solubility and liquid crystal properties,and the other two compounds have better crystallization properties.Amino acid compounds with good solubility can be used in various fields such as food,medicine,cosmetics series and so on.?3?In the third chapter,the method of chemical reaction in solution prepared Terbium?III?octanoylphenylalanine complex?Tb?oct-phe?₃·H₂O?and Europium?III?octanoylphenylalanine complex?Eu?oct-phe?₃·H₂O?.Through elemental analysis,FT-IR spectrum,UV-Vis absorption spectrum,emission spectrum and ultraviolet light observation,the effects of different rare earth ions on the structure and properties of the complexes were systematically investigated,and the luminescent mechanism of rare earth amino acid complexes is discussed.Preliminary studies have found that rare earth?Eu,Tb?octanoylphenylalanine complexes have good luminescence properties.?4?In the fourth chapter,summarize the paper and looks forward to the development of the best amino acid series rare earth complexes from the experimental,theoretical and functional perspectives.