[Synthesis of ternary complexes of rare earth perchlorate with L-alanine and imidazale and the infrared spectral study].

The title complexes RE(Ala)4(Im)(ClO4)3.2H2O (RE = Sm, Pr or Nd) were synthesized by the reaction of rare earth perchlorates with alanine and imidazale in aqueous solution. The infrared spectra of the complexes were measured and their principal IR bands were assigned. The results show that alanine molecules are zwitterions in the complexes and coordinate with rare earth ions through carboxyl groups, and with the atomic weight of rare earth increasing, the ionization of the coordinate band decreases, while the convalence increases. Imidazale was found to coordinate with rare earth by nitrogen atom.