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Kutus B, Dudás C, Orbán E, Lupan A, Attia AAA, Pálinkó I, Sipos P, Peintler G. Magnesium(II) d-Gluconate Complexes Relevant to Radioactive Waste Disposals: Metal-Ion-Induced Ligand Deprotonation or Ligand-Promoted Metal-Ion Hydrolysis? Inorg Chem 2019; 58:6832-6844. [PMID: 31066555 PMCID: PMC6750863 DOI: 10.1021/acs.inorgchem.9b00289] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Indexed: 11/28/2022]
Abstract
The complexation equilibria between Mg2+ and d-gluconate (Gluc-) ions are of particular importance in modeling the chemical speciation in low- and intermediate-level radioactive waste repositories. NMR measurements and potentiometric titrations conducted at 25 °C and 4 M ionic strength revealed the formation of the MgGluc+, MgGlucOH0, MgGluc(OH)2-, and Mg3Gluc2(OH)40 complexes. The trinuclear species provides indirect evidence for the existence of multinuclear magnesium(II) hydroxido complexes, whose formation was proposed earlier but has not been confirmed yet. Additionally, speciation calculations demonstrated that MgCl2 can markedly decrease the solubility of thorium(IV) at low ligand concentrations. Regarding the structure of MgGluc+, both IR spectra and density functional theory (DFT) calculations indicate the monodentate coordination of Gluc-. By the potentiometric data, the acidity of the water molecules is higher in the MgGluc+ and MgGlucOH0 species than in the Mg(H2O)62+ aqua ion. On the basis of DFT calculations, this ligand-promoted hydrolysis is caused by strong hydrogen bonds forming between Gluc- and Mg(H2O)62+. Conversely, metal-ion-induced ligand deprotonation takes place in the case of calcium(II) complexes, giving rise to salient variations on the NMR spectra in a strongly alkaline medium.
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Affiliation(s)
- Bence Kutus
- Department of Molecular Spectroscopy, Max
Planck Institute for Polymer Research, D-55128 Mainz, Germany
- Institute of Chemistry, University
of Szeged, H-6720 Szeged, Hungary
| | - Csilla Dudás
- Institute of Chemistry, University
of Szeged, H-6720 Szeged, Hungary
| | - Eszter Orbán
- Institute of Chemistry, University
of Szeged, H-6720 Szeged, Hungary
| | - Alexandru Lupan
- Department of Chemistry, Babeş-Bolyai
University, RO-400028 Cluj-Napoca, Romania
| | - Amr A. A. Attia
- Department of Chemistry, Babeş-Bolyai
University, RO-400028 Cluj-Napoca, Romania
| | - István Pálinkó
- Institute of Chemistry, University
of Szeged, H-6720 Szeged, Hungary
| | - Pál Sipos
- Institute of Chemistry, University
of Szeged, H-6720 Szeged, Hungary
| | - Gábor Peintler
- Institute of Chemistry, University
of Szeged, H-6720 Szeged, Hungary
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Zhang Z, Helms G, Clark SB, Tian G, Zanonato P, Rao L. Complexation of Uranium(VI) by Gluconate in Acidic Solutions: a Thermodynamic Study with Structural Analysis. Inorg Chem 2009; 48:3814-24. [DOI: 10.1021/ic8018925] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhicheng Zhang
- Chemistry Department and Center for NMR Spectroscopy, Washington State University, Pullman, Washington 99164, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and Dipartimento di Scienze Chimiche, Università di Padova, via Marzolo 1, 35131, Padova, Italy
| | - Gregory Helms
- Chemistry Department and Center for NMR Spectroscopy, Washington State University, Pullman, Washington 99164, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and Dipartimento di Scienze Chimiche, Università di Padova, via Marzolo 1, 35131, Padova, Italy
| | - Sue B. Clark
- Chemistry Department and Center for NMR Spectroscopy, Washington State University, Pullman, Washington 99164, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and Dipartimento di Scienze Chimiche, Università di Padova, via Marzolo 1, 35131, Padova, Italy
| | - Guoxin Tian
- Chemistry Department and Center for NMR Spectroscopy, Washington State University, Pullman, Washington 99164, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and Dipartimento di Scienze Chimiche, Università di Padova, via Marzolo 1, 35131, Padova, Italy
| | - PierLuigi Zanonato
- Chemistry Department and Center for NMR Spectroscopy, Washington State University, Pullman, Washington 99164, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and Dipartimento di Scienze Chimiche, Università di Padova, via Marzolo 1, 35131, Padova, Italy
| | - Linfeng Rao
- Chemistry Department and Center for NMR Spectroscopy, Washington State University, Pullman, Washington 99164, Lawrence Berkeley National Laboratory, Berkeley, California 94720, and Dipartimento di Scienze Chimiche, Università di Padova, via Marzolo 1, 35131, Padova, Italy
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Zhang Z, Gibson P, Clark SB, Tian G, Zanonato PL, Rao L. Lactonization and Protonation of Gluconic Acid: A Thermodynamic and Kinetic Study by Potentiometry, NMR and ESI-MS. J SOLUTION CHEM 2007. [DOI: 10.1007/s10953-007-9182-x] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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