Abstract: The binary and ternary complexes of rare earth La and Eu with 1,10-phenanthroline and L-glutamic acid are synthesized. Their compositions confirmed by elemental analysis are Ln(phen)(Glu)₃·7H₂O(Ln=La, Eu) and Eu(Glu)₃·12H₂O.
The coordination fashion of ligands and metal ions is studied by NMR and IR. The influence on NMR spectra by screening effect and paramagnetic character of rare earth ions are also discussed in this paper.
The NMR studies show that La and Eu complexes have similar symmetric construction and irregular changes of chemical shifts. Glu and phen are simple dentate and bidentate ligand respectively. The coordination numbers of lanthanum and europium are five and three in ternary complex and in binary complex each. (Not including ligand of H₂O in each complexes).

Key words: La, Eu, Glu, Phen, NMR, IR