Design,Synthesis And Properties Of Novel Iridium Complexes Containing 1,10-phenanthroline-5,6 Dione Derivatives

Nowdays,photoluminescent cyclometalated iridium?III?complexes are a recognized class of organometallic compounds with potential applications in biology and life sciences.In addition,luminescent probes of iridium complexes have been widely used for real-time detection and tracking of the concentration and distribution of inorganic ions in living bodies.And iridium complexes have a range of good properties.First,iridium complexes could be easily synthesized under milder reaction conditions than organic fluorophores.Second,through changing the metal and the ligand,the photophysical properties of the metal complex can be easily adjusted.Third,the large Stokes shift performance of metal complexes can effectively reduce the occurrence of self-quenching.Based on these advantages,it has played an important role in the broader field of life sciences such as imaging,sensing and therapy.1,10-phenanthroline-5,6-dione is a classic chelating bidentate ligand.For transition metal ions,it plays an important role in the development of coordination chemistry,and universal materials for supramolecular chemistry.1,10-phenanthroline-5,6-dione is a rigid,planar,hydrophobic,electron-deficient heterogeneous system,and its nitrogen atoms are beautifully placed in a cation bond to act synergistically.These structural characteristics determine its coordination ability to metal ions,and it still has considerable prospects for complexes.Based on the above viewpoints,a series of novel complexes containing1,10-phenanthroline-5,6-dione derivatives were synthesized in this paper.The main research contents are as follows:The first chapter summarizes the application of 1,10-phenanthroline-5,6-dione in the direction of complexes and the research progress of iridium complexes in the direction of metal probes.The second chapter designed and synthesized the thiourea-modified1,10-phenanthroline-5,6-dione ring metal iridium?III?complex luminescent probe Ir-1,and characterized Ir-1.Fluorescence spectroscopy of Ir-1 found that HCO₃^-and CO₃^2-could be detected in THF,and the detection mechanism was verified.The third chapter design and synthesis of a 2-aldehyde thiophene-modified1,10-phenanthroline-5,6-dione ring iridium?III?complex luminescent probe Ir-2.Through studying its emission spectrum,which found after addition the H₂PO₄^-to the THF solution of Ir-2,the luminescence significantly enhanced,indicating that H₂PO₄^-could be specifically detected in the THF solution of Ir-2.The fourth chapter design and synthesis two different iridium?III?complexes Ir-3,Ir-4.The change of the conjugate property of the complex ligand was used to study the luminescent properties of the complex.