ISSN:
1572-8927
Keywords:
Neodymium Complexation
;
glutamic acid complex
;
aspartic acid complex
;
phenanthroline ternary complexes
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract Complexation of neodymium(III)–glutamate(glu)–phenanthroline(phen), neodymium(III)–aspartate(asp)–phenamhroline(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 parameters Fks and the Lande parameter ξ 4f 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1023/A:1024493230082
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