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Glyphosate complexation to aluminium(III). An equilibrium and structural study in solution using potentiometry, multinuclear NMR, ATR-FTIR, ESI-MS and DFT calculations

Journal article
Authors M. Purgel
Z. Takacs
Caroline Jonsson
L. Nagy
I. Andersson
I. Banyai
I. Papai
P. Persson
S. Sjoberg
I. Toth
Published in Journal of Inorganic Biochemistry
Volume 103
Issue 11
Pages 1426-1438
ISSN 0162-0134
Publication year 2009
Published at Department of Chemistry
Pages 1426-1438
Language en
Keywords Al(III), PMG, Glyphosate, Speciation, Equilibria, Multinuclear NMR, DFT, ESI-MS, ATR-FTIR, NUCLEAR-MAGNETIC-RESONANCE, AQUEOUS-SOLUTION, ELECTROSPRAY-IONIZATION, MICROBIAL-DEGRADATION, COPPER(II) COMPLEXES, PHOSPHATE COMPLEXES, ADSORPTION, LIGANDS, ALUMINUM(III), SPECTROSCOPY scigloo.
Subject categories Spectroscopy, Coordination chemistry, Solution chemistry

Abstract

The stoichiometries and stability constants of a series of Al3+-N-phosponomethyl glycine (PMG/H3L) complexes have been determined in acidic aqueous solution using a combination of precise potentiometric titration data, quantitative Al-27 and P-31 NMR spectra, ATR-FTIR spectrum and ESI-MS measurements (0.6 M NaCl, 25 degrees C). Besides the mononuclear AlH2L2+, Al(H2L)(HL), Al(HL)(2)(-) and Al(HL)L2-, dimeric Al-2(HL)L+ and trinuclear Al3H5L42+ complexes have been postulated. H-1 and P-31 NMR data show that different isomers co-exist in solution and the isomerization reactions are slow on the P-31 NMR time scale. The geometries of monomeric and dimeric complexes likely double hydroxo bridged and double phosphonate bridged isomers have been optimized using DFT ab initio calculations starting from rational structural proposals. Energy calculations using the PCM solvation method also support the co-existence of isomers in solutions. (C) 2009 Elsevier Inc. All rights reserved.

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