Studies On Synthesis,Characterization Of The Complexes Of Rare Earth Elements With Open-chain Amide Ligands

Recently lanthanide complexes with open-chain amide ligand have attracted much attention mainly because the ligands have the unusual molecular structures: changeable chain, inflexibly terminal group and high selectivity and coordination to lanthanide ions.In this dissertation, two series of open-chain amide ligands and their lanthanide complexes have been synthesized and characterized in details with elemental analyses, molar conductance, spectral (infrared, ¹H NMR, MS) and thermal studies. The luminescence properties of the complexes have also been investigated. This dissertation includes mainly the following four aspects:1. A brief view of the research progress for both the rare earth complexes with rare earth supramolecular complexes study and application.2. Synthesis and characterization of the ligands L¹ and L² and their rare earth complexes, L¹ and L2 represent:2,2'-(1,2-phenylenebis-(oxy))bis(N-plenylacetamide) 2,2'-(1,3-phenylenebis(oxy))bis(N-phenylacetamide)On the basis of element analysis, mass spectra, ¹H NMR, IR spectra, molar conductance, fluorescence and TG-DTA, their composition and properties were determined. The structure of the complexes of L¹ were :[RE L¹ (NO₃)₃]·H₂O (RE= La³⁺,Eu³⁺,Gd³⁺,Tb³⁺) The structure of the complexes of L²were:[RE₂L₂²(NO₃)₅·3H₂O] NO₃ (RE=La³⁺,Eu³⁺,Gd³⁺,Tb³⁺)3. Synthesis and characterization of the ligands L³ and their rare earth complexes, L³ represent: 1,4-bis(oxoacetyl-2-aminopyridine- N-Oxide)benzeneOn the basis of element analysis, mass spectra, ¹H NMR, IR spectra, molar conductance, fluorescence and TG-DTA, their composition and properties were determined. Their structure of their complexes were :[RE L⁶ (NO₃)₂]NO₃·H₂O (RE= La³⁺,Eu³⁺,Gd³⁺,Tb³⁺) 4. Synthesis and characterization of the ligands L⁴,L⁵and L⁶, L⁴,L⁵and L⁶ represent: 1,4-bis(oxoacetyl-2-aminopyridine)benzene 1,2-bis(oxoacetyl-2-aminopyridine)benzene 1,3-bis(oxoacetyl-2-aminopyridine)benzenOn the basis of element analysis, mass spectra, ¹H NMR, IR spectra, molar conductance, fluorescence and TG-DTA, their composition and properties were determined. In the synthesing process of their rare earth complexes, we can not obtain pure complexes. Maybe the complexation between the ligand and the lanthanide nitrates is poor.