Synthesis And Characterizations Of Metal Complexes Of1,10-phenanthroline Ligand

1,10-phenanthroline with nitrogen six-membered heterocyclic ring structure,possesses excellent ability of accepting π electrons, and is easy to form a stablecoordination compound with a variety of metal ions, so it has excellent opticalproperties. Using1,10-phenanthroline as the starting material, we designed andsynthesized the ligand:₂-Phenyl-imidazo[4,5-f]l,10-Phenanthroline （PIP）, as well astwo polymeric complexes:[Zn（PIP）₂（NO₃）₂]·₂H₂O and [Cu（PIP）₂Cl]·₂H₂O. Themolecular compositions and stuctures of these complexes were studied, theirluminescent properties were investigated by means of fluorescence. Main works are asfollow:In this dissertation,1,10-phenanthroline–5,6-dione was synthesized as precursorafter methanol recrystallization with7₂.4%production rate. Then the₂–phenyl–imidazo[4,5–f] l,10-phenanthroline （PIP） ligand was prepared. The structure and fluorescentproperties of the ligand were investigated by means of the H-NMR，FTIR，UV andFluorescence Detection. It was recorded at biggest excitation wavelength λex=₃95nmand emission wavelength λem=47₂nm.Base on the PIP ligant,[Zn（PIP）₂（NO₃）₂]·₂H₂O and [Cu（PIP）₂Cl]·₂H₂O were alsosynthesized. The UV spectra and Fluorescence Spectra were used to characterize thestructures of the two samples. The results showed that,1) Metal ions were coordinatedwith the ligand.₂) The biggest excitation wavelength and emission wavelength of[Zn（PIP）₂（NO_<sub>3）₂]·₂H₂O were λ_ex=4₃₂nm and λ_em=47₂nm which indicated that it hadexcellent fluorescent properties; and the coordination polymer [Cu（PIP）₂Cl]·₂H₂Oprensents fluoreseence at λ_em=5₃9nm under the excitation wavelength λex=457nm.As the electron clouded on the ligand moving to the empty orbital on the metal ions,the red shift phenomenon of the emission wavelengths of two complexes werehappened. The fluorescence intensity of the two complexes and imidazole medicamentligands were determined and compared at the concentration of1.0×10-5mol/L. Theresults showed that the fluorescence intensity of [Zn（PIP）₂（NO₃）₂]·₂H₂O was obviouslyenhanced, the fluorescence quantum yields could reach0.17, which had good luminousefficiency; and the fluorescence quantum yields of [Cu（PIP）₂Cl]·₂H₂O was0.15, whichhad low luminous efficiency.