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Rashid MH, Borca CN, Xto JM, Huthwelker T. X-Ray absorption spectroscopy on airborne aerosols. ENVIRONMENTAL SCIENCE: ATMOSPHERES 2022; 2:1338-1350. [PMID: 36561554 PMCID: PMC9648630 DOI: 10.1039/d2ea00016d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Accepted: 09/26/2022] [Indexed: 11/07/2022]
Abstract
Here we demonstrate a method for performing X-ray absorption spectroscopy (XAS) on airborne aerosols. XAS provides unique insight into elemental composition, chemical and phase state, local coordination and electronic structure of both crystalline and amorphous matter. The aerosol is generated from different salt solutions using a commercial atomizer and dried using a diffusion drier. Embedded in a carrier gas, the aerosol is guided into the experimental chamber for XAS analysis. Typical particle sizes range from some 10 to a few 100 nm. Inside the chamber the aerosol bearing gas is then confined into a region of about 1-2 cm3 in size, by a pure flow of helium, generating a stable free-flowing stream of aerosol. It is hit by a monochromatic X-ray beam, and the emitted fluorescent light is used for spectroscopic analysis. Using an aerosol generated from CaCl2, KCl, and (NH4)2SO4 salt solutions, we demonstrate the functionality of the system in studying environmentally relevant systems. In addition, we show that the detection limits are sufficient to also observe subtle spectroscopic signatures in XAS spectra with integration times of about 1-2 hours using a bright undulator beamline. This novel setup opens new research opportunities for studying the nucleation of new phases in multicomponent aerosol systems in situ, and for investigating (photo-) chemical reactions on airborne matter, as relevant to both atmospheric science and also for general chemical application.
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Affiliation(s)
- Muhammad H. Rashid
- Paul Scherrer Institute, Swiss Light Source, Laboratory for FemtochemistryForschungsstrasse 111Villigen PSISwitzerland
| | - Camelia N. Borca
- Paul Scherrer Institute, Swiss Light Source, Laboratory for FemtochemistryForschungsstrasse 111Villigen PSISwitzerland
| | - Jacinta M. Xto
- Paul Scherrer Institute, Swiss Light Source, Laboratory for FemtochemistryForschungsstrasse 111Villigen PSISwitzerland
| | - Thomas Huthwelker
- Paul Scherrer Institute, Swiss Light Source, Laboratory for FemtochemistryForschungsstrasse 111Villigen PSISwitzerland
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2
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Alkali metal chlorides in DMSO–methanol binary mixtures: insights into the structural properties through molecular dynamics simulations. Theor Chem Acc 2021. [DOI: 10.1007/s00214-021-02856-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Yamaguchi T, Nishino M, Yoshida K, Takumi M, Nagata K, Hattori T. Ion Hydration and Association in an Aqueous Calcium Chloride Solution in the GPa Range. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900016] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Toshio Yamaguchi
- Department of Chemistry Faculty of Science Fukuoka University Jonan Fukuoka 814‐0180 Japan
| | - Masaaki Nishino
- Department of Chemistry Faculty of Science Fukuoka University Jonan Fukuoka 814‐0180 Japan
| | - Koji Yoshida
- Department of Chemistry Faculty of Science Fukuoka University Jonan Fukuoka 814‐0180 Japan
| | - Masaharu Takumi
- Department of Applied Physics Faculty of Science Fukuoka University Jonan Fukuoka 814‐0180 Japan
| | - Kiyofumi Nagata
- Department of Applied Physics Faculty of Science Fukuoka University Jonan Fukuoka 814‐0180 Japan
| | - Takanori Hattori
- J‐PARC Center Faculty of Science Japan Atomic Energy Agency Tokai Ibaragi 319‐1195 Japan
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5
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Molecular dynamics simulation study on distinctive hydration characteristics of highly coordinated calcium chloride complexes. J Mol Liq 2019. [DOI: 10.1016/j.molliq.2018.10.136] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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6
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Zhu L, Han Y. Influence of alternating electric fields and impurity Mg2+ on CaCl2 aqueous solution: A study by molecular dynamics simulation. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.09.033] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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7
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Keshri S, Tembe BL. Structural and Dynamical Properties of Alkaline Earth Metal Halides in Supercritical Water: Effect of Ion Size and Concentration. J Phys Chem B 2017; 121:10543-10555. [DOI: 10.1021/acs.jpcb.7b07690] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sonanki Keshri
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - B. L. Tembe
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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Ohkubo T, Kusudo T, Kuroda Y. Asymmetric hydration structure around calcium ion restricted in micropores fabricated in activated carbons. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2016; 28:464003. [PMID: 27624154 DOI: 10.1088/0953-8984/28/46/464003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The adsorbed phase and hydration structure of an aqueous solution of Ca(NO3)2 restricted in micropores fabricated in activated carbons (ACs) having different average pore widths (0.63 and 1.1 nm) were investigated with the analysis of adsorption isotherms and x-ray absorption fine structure (XAFS) spectra on Ca K-edge. The adsorbed density of Ca(2+) per unit micropore volume in the narrower pore was higher than in the wider pore, while the adsorbed amount per unit mass of carbon with the narrower pore was half of the amount of ACs with the larger pore. On the other hand, variations in the bands assigned to double-electron (KM I) and 1s → 3d excitations in XAFS spectra demonstrate the formation of a distorted hydration cluster around Ca(2+) in the micropore, although the structural parameters of hydrated Ca(2+) in the micropores were almost consistent with the bulk aqueous solution, as revealed by the analysis of extended XAFS (EXAFS) spectra. In contrast to the hydration structure of monovalent ions such as Rb(+), which generally presents a dehydrated structure in smaller than 1 nm micropores in ACs, the present study clearly explains that the non-spherically-symmetric structure of hydrated Ca(2+) restricted in carbon micropores whose sizes are around 1 nm is experimentally revealed where any dehydration phenomena from the first hydration shell around Ca(2+) could not be observed.
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Affiliation(s)
- Takahiro Ohkubo
- Department of Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Kita-ku, Okayama 700-8530, Japan
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Yoo J, Wilson J, Aksimentiev A. Improved model of hydrated calcium ion for molecular dynamics simulations using classical biomolecular force fields. Biopolymers 2016; 105:752-63. [PMID: 27144470 PMCID: PMC4958550 DOI: 10.1002/bip.22868] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 04/26/2016] [Accepted: 04/28/2016] [Indexed: 12/16/2022]
Abstract
Calcium ions (Ca(2+) ) play key roles in various fundamental biological processes such as cell signaling and brain function. Molecular dynamics (MD) simulations have been used to study such interactions, however, the accuracy of the Ca(2+) models provided by the standard MD force fields has not been rigorously tested. Here, we assess the performance of the Ca(2+) models from the most popular classical force fields AMBER and CHARMM by computing the osmotic pressure of model compounds and the free energy of DNA-DNA interactions. In the simulations performed using the two standard models, Ca(2+) ions are seen to form artificial clusters with chloride, acetate, and phosphate species; the osmotic pressure of CaAc2 and CaCl2 solutions is a small fraction of the experimental values for both force fields. Using the standard parameterization of Ca(2+) ions in the simulations of Ca(2+) -mediated DNA-DNA interactions leads to qualitatively wrong outcomes: both AMBER and CHARMM simulations suggest strong inter-DNA attraction whereas, in experiment, DNA molecules repel one another. The artificial attraction of Ca(2+) to DNA phosphate is strong enough to affect the direction of the electric field-driven translocation of DNA through a solid-state nanopore. To address these shortcomings of the standard Ca(2+) model, we introduce a custom model of a hydrated Ca(2+) ion and show that using our model brings the results of the above MD simulations in quantitative agreement with experiment. Our improved model of Ca(2+) can be readily applied to MD simulations of various biomolecular systems, including nucleic acids, proteins and lipid bilayer membranes. © 2016 Wiley Periodicals, Inc. Biopolymers 105: 752-763, 2016.
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Affiliation(s)
- Jejoong Yoo
- Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801
- Center for the Physics of Living Cells
| | - James Wilson
- Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801
| | - Aleksei Aksimentiev
- Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, Illinois 61801
- Center for the Physics of Living Cells
- Beckman Institute for Advanced Science and Technology
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10
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Molecular dynamics simulations of Ca2+Cl− ion pair in polar mixtures of acetone and water: Solvation and dynamical studies. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.09.061] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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11
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Keshri S, Mandal R, Tembe B. Solvation structures and dynamics of alkaline earth metal halides in supercritical water: A molecular dynamics study. Chem Phys 2016. [DOI: 10.1016/j.chemphys.2016.08.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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12
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Antalek M, Pace E, Hedman B, Hodgson KO, Chillemi G, Benfatto M, Sarangi R, Frank P. Solvation structure of the halides from x-ray absorption spectroscopy. J Chem Phys 2016; 145:044318. [PMID: 27475372 PMCID: PMC4967075 DOI: 10.1063/1.4959589] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2016] [Accepted: 07/11/2016] [Indexed: 11/14/2022] Open
Abstract
Three-dimensional models for the aqueous solvation structures of chloride, bromide, and iodide are reported. K-edge extended X-ray absorption fine structure (EXAFS) and Minuit X-ray absorption near edge (MXAN) analyses found well-defined single shell solvation spheres for bromide and iodide. However, dissolved chloride proved structurally distinct, with two solvation shells needed to explain its strikingly different X-ray absorption near edge structure (XANES) spectrum. Final solvation models were as follows: iodide, 8 water molecules at 3.60 ± 0.13 Å and bromide, 8 water molecules at 3.40 ± 0.14 Å, while chloride solvation included 7 water molecules at 3.15 ± 0.10 Å, and a second shell of 7 water molecules at 4.14 ± 0.30 Å. Each of the three derived solvation shells is approximately uniformly disposed about the halides, with no global asymmetry. Time-dependent density functional theory calculations simulating the chloride XANES spectra following from alternative solvation spheres revealed surprising sensitivity of the electronic state to 6-, 7-, or 8-coordination, implying a strongly bounded phase space for the correct structure during an MXAN fit. MXAN analysis further showed that the asymmetric solvation predicted from molecular dynamics simulations using halide polarization can play no significant part in bulk solvation. Classical molecular dynamics used to explore chloride solvation found a 7-water solvation shell at 3.12 (-0.04/+0.3) Å, supporting the experimental result. These experiments provide the first fully three-dimensional structures presenting to atomic resolution the aqueous solvation spheres of the larger halide ions.
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Affiliation(s)
- Matthew Antalek
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, USA
| | - Elisabetta Pace
- Laboratori Nazionali di Frascati-INFN, P.O. Box 13, 00044 Frascati, Italy
| | - Britt Hedman
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, USA
| | - Keith O Hodgson
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
| | - Giovanni Chillemi
- CINECA, SCAI-SuperComputing Applications and Innovation Department, Via dei Tizii 6, 00185 Roma, Italy
| | - Maurizio Benfatto
- Laboratori Nazionali di Frascati-INFN, P.O. Box 13, 00044 Frascati, Italy
| | - Ritimukta Sarangi
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, USA
| | - Patrick Frank
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, Menlo Park, California 94025, USA
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13
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Han Y, Zhu L, Zhang Y. Molecular dynamics simulation for the impact of external electric fields on CaCl2 aqueous solution. Chem Res Chin Univ 2016. [DOI: 10.1007/s40242-016-6106-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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14
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High-resolution Measurement of Contact Ion-pair Structures in Aqueous RbCl Solutions from the Simultaneous Corefinement of their Rb and Cl K-edge XAFS and XRD Spectra. J SOLUTION CHEM 2016. [DOI: 10.1007/s10953-016-0487-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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15
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Baer MD, Mundy CJ. Local Aqueous Solvation Structure Around Ca2+ During Ca2+···Cl– Pair Formation. J Phys Chem B 2016; 120:1885-93. [DOI: 10.1021/acs.jpcb.5b09579] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marcel D. Baer
- Physical Science Division, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
| | - Christopher J. Mundy
- Physical Science Division, Pacific Northwest National Laboratory, Richland, Washington 99354, United States
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16
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Affiliation(s)
| | - Ryota MORINAGA
- Graduate School of Science and Technology, Saitama University
| | - Shingo SAITO
- Graduate School of Science and Technology, Saitama University
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Reimer J, Steele-MacInnis M, Wambach JM, Vogel F. Ion Association in Hydrothermal Sodium Sulfate Solutions Studied by Modulated FT-IR-Raman Spectroscopy and Molecular Dynamics. J Phys Chem B 2015; 119:9847-57. [DOI: 10.1021/acs.jpcb.5b03192] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Joachim Reimer
- Laboratory
for Bioenergy and Catalysis, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Matthew Steele-MacInnis
- Institut
für Geochemie und Petrologie, ETH Zürich NW F 82.4, Clausiusstrasse 25, 8092 Zürich, Switzerland
| | - Jörg M. Wambach
- Laboratory
for Bioenergy and Catalysis, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Frédéric Vogel
- Laboratory
for Bioenergy and Catalysis, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
- Institut für Biomasse und Ressourceneffizienz Fachhochschule Nordwestschweiz 5210 Windisch, Switzerland
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18
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Jackson VE, Felmy AR, Dixon DA. Prediction of the pKa's of aqueous metal ion +2 complexes. J Phys Chem A 2015; 119:2926-39. [PMID: 25721568 DOI: 10.1021/jp5118272] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Aqueous metal ions play an important role in many areas of chemistry. The acidities of [Be(H2O)4](2+), [M(H2O)6](2+), M = Mg(2+), Mn(2+), Fe(2+), Co(2+), Ni(2+), Cu(2+), Zn(2+), Cd(2+), and Hg(2+), and [M(H2O)n](2+), M = Ca(2+) and Sr(2+), n = 7 and 8, complexes have been predicted using density functional theory, second-order Møller-Plesset perturbation theory (MP2), and coupled cluster CCSD(T) theory in the gas phase. pKa's in aqueous solution were predicted by using self-consistent reaction field (SCRF) calculations with different solvation models. The most common binding motif of the majority of the metal +2 complexes is coordination number (CN) 6, with each hexaaquo cluster having reasonably high symmetry for the best arrangement of the water molecules in the first solvation shell. Be(2+) is tetracoordinated, but a second solvation shell of 8 waters is needed to predict the pKa. The Ca(2+) and Sr(2+) aquo clusters have a coordination number of 7 or 8 as found in terms of the energy of the reaction M(H2O)7(2+) + H2O → M(H2O)8(2+) and the pKa values. The calculated geometries are in reasonable agreement with experiment. The SCRF calculations with the conductor-like screening model (COSMO), and the conductor polarized continuum model (CPCM) using COSMO-RS radii, consistently agree best with experiment at the MP2/aug-cc-pVDZ and CCSD(T)/aug-cc-pVDZ levels of theory. The CCSD(T) level provides the most accurate pKa's, and the MP2 level also provides reliable predictions. Our predictions were used to elucidate the properties of metal +2 ion complexes. The pKa predictions provide confirmation of the size of the first solvation shell sizes. The calculations show that it is still difficult to predict pKa's using this cluster/implicit solvent approach to better than 1 pKa unit.
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Affiliation(s)
- Virgil E Jackson
- †Department of Chemistry, The University of Alabama, Shelby Hall, Tuscaloosa, Alabama 35487-0336, United States
| | - Andrew R Felmy
- ‡Fundamental Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - David A Dixon
- †Department of Chemistry, The University of Alabama, Shelby Hall, Tuscaloosa, Alabama 35487-0336, United States
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Bogatko S, Cauët E, Bylaska E, Schenter G, Fulton J, Weare J. The aqueous Ca2+ system, in comparison with Zn2+, Fe3+, and Al3+: an ab initio molecular dynamics study. Chemistry 2013; 19:3047-60. [PMID: 23315704 DOI: 10.1002/chem.201202821] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Indexed: 11/08/2022]
Abstract
Herein, we report on the structure and dynamics of the aqueous Ca(2+) system studied by using ab initio molecular dynamics (AIMD) simulations. Our detailed study revealed the formation of well-formed hydration shells with characteristics that were significantly different to those of bulk water. To facilitate a robust comparison with state-of-the-art X-ray absorption fine structure (XAFS) data, we employ a 1st principles MD-XAFS procedure and directly compare simulated and experimental XAFS spectra. A comparison of the data for the aqueous Ca(2+) system with those of the recently reported Zn(2+), Fe(3+), and Al(3+) species showed that many of their structural characteristics correlated well with charge density on the cation. Some very important exceptions were found, which indicated a strong sensitivity of the solvent structure towards the cation's valence electronic structure. Average dipole moments for the 2nd shell of all cations were suppressed relative to bulk water.
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Affiliation(s)
- Stuart Bogatko
- Chemistry and Biochemistry Department, University of California, San Diego, 9500 Gilman Dr., La Jolla, CA 92093, USA.
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20
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Fulton JL, Balasubramanian M, Pham VT, Deverman GS. A variable ultra-short-pathlength solution cell for XAFS transmission spectroscopy of light elements. JOURNAL OF SYNCHROTRON RADIATION 2012; 19:949-953. [PMID: 23093754 DOI: 10.1107/s090904951203806x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2012] [Accepted: 09/04/2012] [Indexed: 06/01/2023]
Abstract
An X-ray absorption fine-structure spectroscopy (XAFS) cell that is suitable for solution-phase studies of the light elements in the series from Na(+) and Ca(2+) is described. This cell has an ultra-short pathlength that can be remotely adjusted using a miniature stepper-motor drive and thereby readily provides transmission pathlengths in the range from submicrometer to several hundred micrometers. The flexibility to vary the pathlength enables acquisition of high-quality XAFS spectra and also allows one to check for potential distortions in the spectra from thickness effects. The primary components are mostly commercially available optical parts. The performance of this device is demonstrated at the Cl K-edge (2.8 keV) for several different aqueous Cl(-) solutions.
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Affiliation(s)
- John L Fulton
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99354, USA.
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21
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Shibukawa M, Harada M, Okada T, Ogiyama Y, Shimasaki T, Kondo Y, Inoue A, Saito S. X-Ray absorption fine structure spectroscopy studies of thermal effects on ion-exchange equilibria. RSC Adv 2012. [DOI: 10.1039/c2ra21278a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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van Sijl J, Allan NL, Davies GR, van Westrenen W. Solvation of Ti(iv) in aqueous solution under ambient and supercritical conditions. Phys Chem Chem Phys 2011; 13:7371-7. [DOI: 10.1039/c0cp01637c] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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23
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Li G, Camaioni DM, Amonette JE, Zhang ZC, Johnson TJ, Fulton JL. [CuCln]2−n Ion-Pair Species in 1-Ethyl-3-methylimidazolium Chloride Ionic Liquid−Water Mixtures: Ultraviolet−Visible, X-ray Absorption Fine Structure, and Density Functional Theory Characterization. J Phys Chem B 2010; 114:12614-22. [DOI: 10.1021/jp106762b] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Guosheng Li
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, 99354
| | - Donald M. Camaioni
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, 99354
| | - James E. Amonette
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, 99354
| | - Z. Conrad Zhang
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, 99354
| | - Timothy J. Johnson
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, 99354
| | - John L. Fulton
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington, 99354
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Fulton JL, Balasubramanian M. Structure of Hydronium (H3O+)/Chloride (Cl−) Contact Ion Pairs in Aqueous Hydrochloric Acid Solution: A Zundel-like Local Configuration. J Am Chem Soc 2010; 132:12597-604. [DOI: 10.1021/ja1014458] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- John L. Fulton
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99354, and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
| | - Mahalingam Balasubramanian
- Chemical and Materials Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99354, and Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439
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Yamaguchi T, Ohzono H, Yamagami M, Yamanaka K, Yoshida K, Wakita H. Ion hydration in aqueous solutions of lithium chloride, nickel chloride, and caesium chloride in ambient to supercritical water. J Mol Liq 2010. [DOI: 10.1016/j.molliq.2009.10.012] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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26
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Tongraar A, T-Thienprasert J, Rujirawat S, Limpijumnong S. Structure of the hydrated Ca2+ and Cl−: Combined X-ray absorption measurements and QM/MM MD simulations study. Phys Chem Chem Phys 2010; 12:10876-87. [DOI: 10.1039/c0cp00136h] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Da Silva C, Proux O, Hazemann JL, James-Smith J, Testemale D, Yamaguchi T. X-ray absorption spectroscopy study of solvation and ion-pairing in aqueous gallium bromide solutions at supercritical conditions. J Mol Liq 2009. [DOI: 10.1016/j.molliq.2008.06.022] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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28
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Mason PE, Ansell S, Neilson GW, Brady JW. Be2+ Hydration in Concentrated Aqueous Solutions of BeCl2. J Phys Chem B 2008; 112:1935-9. [DOI: 10.1021/jp710180v] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Philip E. Mason
- Department of Food Science, Stocking Hall, Cornell University, Ithaca, New York 14853, ISIS Department, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, U.K., and H.H.Wills Physics Laboratory, University of Bristol, BS8 1TL, U.K
| | - Stuart Ansell
- Department of Food Science, Stocking Hall, Cornell University, Ithaca, New York 14853, ISIS Department, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, U.K., and H.H.Wills Physics Laboratory, University of Bristol, BS8 1TL, U.K
| | - George W. Neilson
- Department of Food Science, Stocking Hall, Cornell University, Ithaca, New York 14853, ISIS Department, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, U.K., and H.H.Wills Physics Laboratory, University of Bristol, BS8 1TL, U.K
| | - John W. Brady
- Department of Food Science, Stocking Hall, Cornell University, Ithaca, New York 14853, ISIS Department, Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, U.K., and H.H.Wills Physics Laboratory, University of Bristol, BS8 1TL, U.K
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Harada M, Satou H, Okada T. Hydration Structures of Bromides on Cationic Micelles. J Phys Chem B 2007; 111:12136-40. [PMID: 17910492 DOI: 10.1021/jp0732662] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The peripheral structures of bromides on dodecyltrimethylammonium bromide (DTAB) and hexadecyltrimethylammonium bromide (HTAB) micelles have been studied by X-ray absorption fine structure (XAFS) at the Br-K edge. The XAFS spectra indicate that water is a dominant scattering group for Br- even in these micellar solutions. However, the oscillation intensity decreases with increasing micellar concentration, suggesting that the bromides are dehydrated to some extent when they are bound to the micelles. A XAFS analysis routine gives unusually short Br-O (water) distances and is inapplicable to the present systems. This comes from the structure of the first coordination shell, in which two or more scattering paths are involved. The second scattering group is obviously the head group of the surfactants forming the micelles. The detailed analysis has allowed us to estimate the hydration number of the bromides bound on the DTAB and HTAB micelles (N = ca. 4.2). The assumption that all of the bromides form direct ion-associates with the head groups causes the contradiction to the results of the XAFS analyses. This strongly implies that some of the bromides partitioned into the micelle are completely hydrated as far as their first coordination shell is concerned. Assuming that the maximum hydration number of the bromides bound to the head groups of the micelle is three, 40% of the bromides partitioned into the micelle are completely hydrated.
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Affiliation(s)
- Makoto Harada
- Department of Chemistry, Tokyo Institute of Technology, Tokyo 152-8551, Japan
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