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Original Articles

Lanthanide Metal Chelates with a Bidentate Schiff Base

, , , &
Pages 863-874 | Received 15 Apr 1991, Accepted 02 Mar 1992, Published online: 23 Sep 2006
 

Abstract

Lanthanide(III) ion chelates with a Schiff base derived from sulphapyridine and salicylaldehyde have been characterised by molar conductance, magnetic moment and spectral data. Coordination of the lanthanide ions occurs through both the phenolic oxygen and the azomethine nitrogen of the Schiff base and two water molecules.

The stability constants of the metal chelates were determined potentiometrically and followed the order La < Ce < Pr = Nd < Dy < Er. A plot of log K versus e 2/r shows an approximately linear relationship.

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