Density functional complexation study of metal ions with (amino) polycarboxylic acid ligands

Atte J. Sillanpää, Reijo Aksela, Kari Laasonen*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

37 Citations (Scopus)

Abstract

We have studied metal complexation with (amino)polycarboxylic acid ligands using density functional methods. Geometry optimisations, continuum-solvation model (COSMO), mixed cluster-continuum model, and Car-Parrinello molecular dynamics simulations have been carried out. The metal solvation energies for Mg2+, Ca2+, Mn2+, Fe3+, and Zn 2+, and their complexation energies with seven (amino)polycarboxylic acid-ligands (total charges between -6 and -4) have been calculated. The solvation energies are not very accurate. The complexation energies with ligands are overestimated, but the trends are reproduced correctly. An effective parametrisation is introduced to correct for omitted contributions to energies. Explicit calculation of these corrections is discussed. The effective parametrisation results in an easy to use and fast procedure to estimate the metal ion complexation constant with different ligands.

Original languageEnglish
Pages (from-to)3382-3393
Number of pages12
JournalPhysical Chemistry Chemical Physics
Volume5
Issue number16
DOIs
Publication statusPublished - 15 Aug 2003
MoE publication typeA1 Journal article-refereed

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