Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
Original Papers
X-Ray Crystallographic Approach to the Design of Phenolic Schiff Base Reagents for the Mutual Separation of Lanthanoids
Koji KUBONONaoki HIRAYAMAHisao KOKUSENKunihiko YOKOI
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2001 Volume 17 Issue 1 Pages 193-197

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Abstract

A novel mutual selectivity of lanthanoids in the N,N′-bis(5-nitrosalicylidene)ethylenediamine (H2Nsalen)-KCl and N,N′-bis(5-nitrosalicylidene)-o-phenylenediamine (H2Nsaloph)-KCl extraction systems was evaluated by the X-ray analysis of similar model complexes for extracted species. Cerium(IV) complexes with N,N′-bis(5-chlorosalicylidene)-ethylenediamine (H2Clsalen), N,N′-bis(salicylidene)-o-phenylenediamine (H2saloph) and N,N′-bis(3,5-dibromosalicylidene)-o-phenylenediamine (H2Br2saloph) were selected as the models. The result of the X-ray analysis suggested that [Ln(III)(Nsalen)2]- and [Ln(III)(Nsaloph)2]- are meridional type (two ligands are oriented perpendicular to each other) and sandwich type (two ligands are oriented parallel to each other), respectively. It was suggested that the selectivity of the meridional structure is superior to that of the sandwich structure in these extraction systems.

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© 2001 by The Japan Society for Analytical Chemistry
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