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Persson I. Structure and size of complete hydration shells of metal ions and inorganic anions in aqueous solution. Dalton Trans 2024; 53:15517-15538. [PMID: 39211949 DOI: 10.1039/d4dt01449a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/04/2024]
Abstract
The structures of nine hydrated metal ions in aqueous solution have been redetermined by large angle X-ray scattering to obtain experimental data of better quality than those reported 40-50 years ago. Accurate M-OI and M-(OI-H)⋯OII distances and M-OI(H)⋯OII bond angles are reported for the hydrated magnesium(II), aluminium(III), manganese(II), iron(II), iron(III), cobalt(II), nickel(II), copper(II) and zinc(II) ions; the subscripts I and II denote oxygen atoms in the first and second hydration sphere, respectively. Reported structures of hydrated metal ions in aqueous solution are summarized and evaluated with emphasis on a possible relationship between M-OI-OII bond angles and bonding character. Metal ions with high charge density have M-OI-OII bond angles close to 120°, indicative of a mainly electrostatic interaction with the oxygen atom in the water molecule in the first hydration shell. Metal ions forming bonds with a significant covalent contribution, as e.g. mercury(II) and tin(II), have M-OI-OII bond angles close to 109.5°. This implies that they bind to one of the free electron pairs in the water molecule. Comparison of M-O bond distances of hydrated metal ions in the solid state with one hydration shell, and in aqueous solution with in most cases at least two hydration shells, shows no significant differences. On the other hand, the X-O bond distance in hydrated oxoanions increases by ca. 0.02 Å in aqueous solution in comparison with the corresponding X-O distance in the solid state. A linear correlation is observed between volume, calculated from the van der Waals radius of the hydrated ion, and the ionic diffusion coefficient in aqueous solution. This correlation strongly indicates that monovalent metal ions, except lithium and silver(I), and singly-charged monovalent oxoanions have a single hydration shell. Divalent metal ions, bismuth(III) and the lanthanoid(III) and actinoid(III) ions have two hydration shells. Trivalent transition and tetravalent metal ions have two full hydration shells and portion of a third one. Doubly charged oxoanions have one well-defined hydration shell and an ill-defined second one.
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Affiliation(s)
- Ingmar Persson
- Department of Molecular Sciences, Swedish University of Agricultural Sciences, P.O. Box 7015, SE-750 07 Uppsala, Sweden.
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Raymond O, Bühl M, Lane JR, Henderson W, Brothers PJ, Plieger PG. Ab Initio Molecular Dynamics Investigation of Beryllium Complexes. Inorg Chem 2020; 59:2413-2425. [PMID: 32017540 DOI: 10.1021/acs.inorgchem.9b03309] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Structures of aqueous [Be(H2O)4]2+, its outer-sphere and inner-sphere complexes with F-, Cl-, and SO42-, and dinuclear complexes with a [Be2(κ-OH)(κ-SO4)]+ core have been studied through Car-Parrinello molecular dynamics (CPMD) simulations with the BLYP functional. According to constrained CPMD/BLYP simulations and pointwise thermodynamic integration, the free energy of deprotonation of [Be(H2O)4]2+ and its binding free energy with F- are 9.6 and -6.2 kcal/mol, respectively, in good accord with available experimental data. The computed activation barriers for replacing a water ligand in [Be(H2O)4]2+ with F- and SO42-, 10.9 and 13.6 kcal/mol, respectively, are also in good qualitative agreement with available experimental data. These ligand-substitution reactions are indicated to follow associative interchange mechanisms with backside (SN2-like) attack of the anion relative to the aquo ligand it is displacing. Outperforming static density functional theory computations of the salient kinetic and thermodynamic quantities involving simple polarizable continuum solvent models, CPMD simulations are validated as a promising tool for studying the structures and speciation of beryllium complexes in aqueous solution.
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Affiliation(s)
- Onyekachi Raymond
- Chemistry, School of Science , University of Waikato , Private Bag 3105 , Hamilton 3240 , New Zealand.,Institute of Environmental Science and Research (ESR) , P.O. Box 50348 , Porirua 5240 , New Zealand.,EaStCHEM School of Chemistry, North Haugh , University of St Andrews , St Andrews , Fife KY16 9ST , U.K
| | - Michael Bühl
- EaStCHEM School of Chemistry, North Haugh , University of St Andrews , St Andrews , Fife KY16 9ST , U.K
| | - Joseph R Lane
- Chemistry, School of Science , University of Waikato , Private Bag 3105 , Hamilton 3240 , New Zealand
| | - William Henderson
- Chemistry, School of Science , University of Waikato , Private Bag 3105 , Hamilton 3240 , New Zealand
| | - Penelope J Brothers
- School of Chemical Sciences , University of Auckland , Private Bag 92019 , Auckland 1142 , New Zealand
| | - Paul G Plieger
- School of Fundamental Sciences , Massey University , Private Bag 11222 , Palmerston North 4410 , New Zealand
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Raymond O, Henderson W, Lane JR, Brothers PJ, Plieger PG. An electrospray ionization mass spectrometric study of beryllium chloride solutions and complexes with crown ether and cryptand macrocyclic ligands. J COORD CHEM 2020. [DOI: 10.1080/00958972.2020.1718664] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Onyekachi Raymond
- Department of Chemistry, School of Science, University of Waikato, Hamilton, New Zealand
- Current Address: Institute of Environmental Science and Research (ESR), Wellington, New Zealand
| | - William Henderson
- Department of Chemistry, School of Science, University of Waikato, Hamilton, New Zealand
| | - Joseph R. Lane
- Department of Chemistry, School of Science, University of Waikato, Hamilton, New Zealand
| | - Penelope J. Brothers
- School of Chemical Sciences, University of Auckland, Auckland, New Zealand. Current Address: Research School of Chemistry, Australian National University, Canberra, ACT, Australia
| | - Paul G. Plieger
- School of Fundamental Sciences, Massey University, Palmerston North, New Zealand
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Abstract
AbstractThe strong, long-range electrostatic forces described by Coulomb's law disappear for ions in water, and the behavior of these ions is instead controlled by their water affinity – a weak, short-range force which arises from their charge density. This was established experimentally in the mid-1980s by size-exclusion chromatography on carefully calibrated Sephadex®G-10 (which measures the effective volume and thus the water affinity of an ion) and by neutron diffraction with isotopic substitution (which measures the density and orientation of water molecules near the diffracting ion and thus its water affinity). These conclusions have been confirmed more recently by molecular dynamics simulations, which explicitly model each individual water molecule. This surprising change in force regime occurs because the oppositely charged ions in aqueous salt solutions exist functionally as ion pairs (separated by 0, 1 or 2 water molecules) as has now been shown by dielectric relaxation spectroscopy; this cancels out the strong long-range electrostatic forces and allows the weak, short-range water affinity effects to come to the fore. This microscopic structure of aqueous salt solutions is not captured by models utilizing a macroscopic dielectric constant. Additionally, the Law of Matching Water Affinity, first described in 1997 and 2004, establishes that contact ion pair formation is controlled by water affinity and is a major determinant of the solubility of charged species since only a net neutral species can change phases.
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Winter ND. Many-Body Potentials for Aqueous Be 2+ Derived from ab Initio Calculations. J Phys Chem B 2016; 120:12371-12378. [PMID: 27934227 DOI: 10.1021/acs.jpcb.6b08419] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An effective three-body potential for the aqueous Be2+ ion has been constructed from a large number of high-level ab initio cluster calculations. The new potential was validated in subsequent molecular dynamics simulations of both gas phase ion-water clusters and bulk liquid. The structures of the first and second solvation shells were studied using radial distribution functions and angular distribution functions. The vibrational spectrum of Be2+ and first shell waters was examined by computing power spectra from the molecular dynamics simulations. The observed bands showed reasonable agreement with experimental spectroscopic frequencies. The potential of mean force for water exchange between the first and second solvation shells was calculated and the energy barrier for exchange was found to have improved agreement with experiment relative to two-body force fields. Examination of the solvation structure near the transition state yielded results consistent with an associative mechanism.
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Affiliation(s)
- Nicolas D Winter
- Physical Sciences Department, Dominican University , River Forest, Illinois 60305, United States
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Mason PE, Ansell S, Neilson GW, Rempe SB. Neutron Scattering Studies of the Hydration Structure of Li+. J Phys Chem B 2015; 119:2003-9. [DOI: 10.1021/jp511508n] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- P. E. Mason
- Institute
of Organic Chemistry
and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo
nám. 2, 16610 Prague 6, Czech Republic
| | - S. Ansell
- Rutherford Appleton Laboratories, Chilton, Oxfordshire OX11 0QX, United Kingdom
| | - G. W. Neilson
- Department Physics, University of Bristol, Tyndall Ave., Bristol BS8 1TL, United Kingdom
| | - S. B. Rempe
- Center for Biological and
Materials Sciences, Sandia National Laboratories, Albuquerque, New Mexico 87185-1315, United States
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Nguyen TN, Duvail M, Villard A, Molina JJ, Guilbaud P, Dufrêche JF. Multi-scale modelling of uranyl chloride solutions. J Chem Phys 2015; 142:024501. [DOI: 10.1063/1.4905008] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Affiliation(s)
- Thanh-Nghi Nguyen
- Institut de Chimie Séparative de Marcoule (ICSM), UMR 5257, CEA-CNRS-Université Montpellier 2-ENSCM, Site de Marcoule, Bâtiment 426, BP 17171, F-30207 Bagnols-sur-Cèze Cedex, France
| | - Magali Duvail
- Institut de Chimie Séparative de Marcoule (ICSM), UMR 5257, CEA-CNRS-Université Montpellier 2-ENSCM, Site de Marcoule, Bâtiment 426, BP 17171, F-30207 Bagnols-sur-Cèze Cedex, France
| | - Arnaud Villard
- Institut de Chimie Séparative de Marcoule (ICSM), UMR 5257, CEA-CNRS-Université Montpellier 2-ENSCM, Site de Marcoule, Bâtiment 426, BP 17171, F-30207 Bagnols-sur-Cèze Cedex, France
| | - John Jairo Molina
- Fukui Institute for Fundamental Chemistry, Kyoto University, Takano-Nishihiraki-cho 34-4, Sakyo-ku, Kyoto 606-8103, Japan
| | - Philippe Guilbaud
- CEA/DEN/DRCP/SMCS/LILA, Marcoule, F-30207 Bagnols-sur-Cèze Cedex, France
| | - Jean-François Dufrêche
- Institut de Chimie Séparative de Marcoule (ICSM), UMR 5257, CEA-CNRS-Université Montpellier 2-ENSCM, Site de Marcoule, Bâtiment 426, BP 17171, F-30207 Bagnols-sur-Cèze Cedex, France
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Collins KD. Why continuum electrostatics theories cannot explain biological structure, polyelectrolytes or ionic strength effects in ion–protein interactions. Biophys Chem 2012; 167:43-59. [DOI: 10.1016/j.bpc.2012.04.002] [Citation(s) in RCA: 169] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Revised: 04/10/2012] [Accepted: 04/10/2012] [Indexed: 01/13/2023]
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Duvail M, Ruas A, Venault L, Moisy P, Guilbaud P. Molecular Dynamics Studies of Concentrated Binary Aqueous Solutions of Lanthanide Salts: Structures and Exchange Dynamics. Inorg Chem 2009; 49:519-30. [DOI: 10.1021/ic9017085] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Magali Duvail
- CEA, Nuclear Energy Division, RadioChemistry & Processes Department, F-30207 Bagnols sur Cèze, France
| | - Alexandre Ruas
- CEA, Nuclear Energy Division, RadioChemistry & Processes Department, F-30207 Bagnols sur Cèze, France
| | - Laurent Venault
- CEA, Nuclear Energy Division, RadioChemistry & Processes Department, F-30207 Bagnols sur Cèze, France
| | - Philippe Moisy
- CEA, Nuclear Energy Division, RadioChemistry & Processes Department, F-30207 Bagnols sur Cèze, France
| | - Philippe Guilbaud
- CEA, Nuclear Energy Division, RadioChemistry & Processes Department, F-30207 Bagnols sur Cèze, France
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Azam SS, Hofer TS, Bhattacharjee A, Lim LHV, Pribil AB, Randolf BR, Rode BM. Beryllium(II): The Strongest Structure-Forming Ion in Water? A QMCF MD Simulation Study. J Phys Chem B 2009; 113:9289-95. [DOI: 10.1021/jp903536k] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- S. Sikander Azam
- Theoretical Chemistry, Division, Institute of General, Inorganic and Theoretical Chemistry University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
| | - Thomas S. Hofer
- Theoretical Chemistry, Division, Institute of General, Inorganic and Theoretical Chemistry University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
| | - Anirban Bhattacharjee
- Theoretical Chemistry, Division, Institute of General, Inorganic and Theoretical Chemistry University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
| | - Len Herald V. Lim
- Theoretical Chemistry, Division, Institute of General, Inorganic and Theoretical Chemistry University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
| | - Andreas B. Pribil
- Theoretical Chemistry, Division, Institute of General, Inorganic and Theoretical Chemistry University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
| | - Bernhard R. Randolf
- Theoretical Chemistry, Division, Institute of General, Inorganic and Theoretical Chemistry University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
| | - Bernd M. Rode
- Theoretical Chemistry, Division, Institute of General, Inorganic and Theoretical Chemistry University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
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