Journal of Solution Chemistry

, Volume 26, Issue 1, pp 105–112 | Cite as

Complexation and electronic spectra of neodymium(III)-amino acid-1,10-phenanthroline systems in aqueous solution

  • Wu Yang
  • Jinzhang Gao
  • Jingwan Kang
  • Weidong Yang


Complexation of neodymium(III)-glutamate(glu)-phenanthroline(phen), neodymium(III)-aspartate(asp)-phenanthroline(phen) ternary systems and the corresponding binary systems in aqueous solution are discussed at various values of pH. Based on change regularity of hypersensitive transition intensities, the neodymium(III)-aspartate-phenanthroline ternary complex has a general formula of Nd(asp)3phen, but the composition of the complex of Nd(III) with glutamate and phenanthroline is complicated and has not been determined. The electronic spectra of these complexes were studied, Slater-Condon parametersF k s and the Lande parameter ξ4f were obtained. The rms deviation between calculated and observed energy levels is less than 43 cm−1. Bonding in these complexes are also investigated and bonding parameters calculated. The results show that Nd(III) and amino acids form complexes by ionic linkage with carboxylic oxygens, but with some weak covalency. Besides, the degrees of covalency in ternary complexes are larger than those in binary complexes.

Key Words

Neodymium complexation glutamic acid complex aspartic acid complex phenanthroline ternary complexes 


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Copyright information

© Plenum Publishing Corporation 1997

Authors and Affiliations

  • Wu Yang
    • 1
  • Jinzhang Gao
    • 1
  • Jingwan Kang
    • 1
  • Weidong Yang
    • 2
  1. 1.Department of ChemistryNorthwest Normal UniversityLanzhouChina
  2. 2.Lanzhou Medical CollegeLanzhouChina

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