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Potentiometric Study of Lanthanide Salicylaldimine Schiff Base Complexes

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Abstract

Formation of complexes between the lanthanide ions and N,N′-bis(salicylidene)-4-methyl-1,3-phenylenediamine ligand was studied in solution by pH potentiometry. The potentiometric titration was performed at 25.00 °C in 0.1 mol·dm−3 NaClO4 ionic strength and in DMSO:water (30:70 v:v) solvent mixture. N,N′-bis(salicylidene)-4-methyl-1,3-phenylenediamine ligand (H2L) occurs in three forms: fully or partially deprotonated and unionized. Computer analysis of potentiometric data indicated that in solution the lanthanide (Ln) complexes exist as LnL2, Ln(HL)2 and Ln(H2L)2 species. This observation appears to be in contrast to the solid-state behavior of these complexes prepared in a self-assembly process and structurally defined. Stability constants for La3+, Eu3+, Gd3+, Tb3+, Ho3+ and Lu3+ (Ln3+) complexes were determined. The order of stabilities of LnL2 species in terms of metal ions is La3+ > Eu3+ ≈ Gd3+ = Tb3+ < Ho3+ < Lu3+ with a prominent “gadolinium break”.

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Acknowledgments

This work was partially supported by the Polish Ministry of Science and Higher Education (Grant N N204 127 039).

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  1. Faculty of Chemistry, Adam Mickiewicz University, Grunwaldzka 6, 60-780, Poznań, Poland

    Małgorzata T. Kaczmarek, Renata Jastrząb & Wanda Radecka-Paryzek

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  1. Małgorzata T. Kaczmarek
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Correspondence to Małgorzata T. Kaczmarek.

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Kaczmarek, M.T., Jastrząb, R. & Radecka-Paryzek, W. Potentiometric Study of Lanthanide Salicylaldimine Schiff Base Complexes. J Solution Chem 42, 18–26 (2013). https://doi.org/10.1007/s10953-012-9946-9

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