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Dang LX, Schenter GK, Glezakou VA, Fulton JL. Molecular Simulation Analysis and X-ray Absorption Measurement of Ca2+, K+and Cl-Ions in Solution. J Phys Chem B 2006; 110:23644-54. [PMID: 17125322 DOI: 10.1021/jp064661f] [Citation(s) in RCA: 104] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This paper presents recent advances in the use of molecular simulations and extended X-ray absorption fine structure (EXAFS) spectroscopy, which enable us to understand solvated ions in solution. We report and discuss the EXAFS spectra and related properties governing solvation processes of different ions in water and methanol. Molecular dynamics (MD) trajectories are coupled to electron scattering simulations to generate the MD-EXAFS spectra, which are found to be in very good agreement with the corresponding experimental measurements. From these simulated spectra, the ion-oxygen distances for the first hydration shell are in agreement with experiment within 0.05-0.1 A. The ionic species studied range from monovalent to divalent, positive and negative: K+, Ca2+, and Cl-. This work demonstrates that the combination of MD-EXAFS and the corresponding experimental measurement provides a powerful tool in the analysis of the solvation structure of aqueous ionic solutions. We also investigate the value of electronic structure analysis of small aqueous clusters as a benchmark to the empirical potentials. In a novel computational approach, we determine the Debye-Waller factors for Ca2+, K+, and Cl- in water by combining the harmonic analysis of data obtained from electronic structure calculations on finite ion-water clusters, providing excellent agreement with the experimental values, and discuss how they compare with results from a harmonic classical statistical mechanical analysis of an empirical potential.
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Affiliation(s)
- Liem X Dang
- Chemical Sciences Division, Pacific Northwest National Laboratory, Richland, Washington 99352, USA
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Abstract
The structure of the hydrated and the dimethyl sulfoxide solvated rubidium ions in solution has been determined by means of large-angle X-ray scattering (LAXS) and extended X-ray absorption fine structure (EXAFS) studies. The models of the hydrated and dimethyl sulfoxide solvated rubidium ions fitting the experimental data best are square antiprisms with Rb-O bond distances of 2.98(2) and 2.98(3) A, respectively. The EXAFS data show a significant asymmetry in the Rb-O bond distance distribution with C(3) values of 0.0076 and 0.015 A(3), respectively. No second hydration sphere is observed around the hydrated rubidium ion. The dimethyl sulfoxide solvated rubidium ion displays a Rb-O-S bond angle of ca. 130 degrees, which is typical for a medium hard electron acceptor such as rubidium.
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Affiliation(s)
- Paola D'Angelo
- Dipartimento di Chimica, Università di Roma La Sapienza, Piazzale Aldo Moro 5, I-00185 Rome, Italy
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Affiliation(s)
- Paola D'Angelo
- Dipartimento di Chimica, Università di Roma “La Sapienza”, P.O. Box 34 - Roma 62, Pzz.le A. Moro 5, I-00185 Roma, Italy, INFM UdF Camerino, Italy, and ESRF, BP 220, F-38043 Grenoble Cedex, France
| | - Pierre-Emmanuel Petit
- Dipartimento di Chimica, Università di Roma “La Sapienza”, P.O. Box 34 - Roma 62, Pzz.le A. Moro 5, I-00185 Roma, Italy, INFM UdF Camerino, Italy, and ESRF, BP 220, F-38043 Grenoble Cedex, France
| | - Nicolae Viorel Pavel
- Dipartimento di Chimica, Università di Roma “La Sapienza”, P.O. Box 34 - Roma 62, Pzz.le A. Moro 5, I-00185 Roma, Italy, INFM UdF Camerino, Italy, and ESRF, BP 220, F-38043 Grenoble Cedex, France
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Díaz-Moreno S, Martínez JM, Muñoz-Páez A, Sakane H, Watanabe I. Molecular Structure Determination by EXAFS of [Y(NCS)6]3- Units in Solid State and in Solution. A Comparison with Density Functional Theory Calculations. J Phys Chem A 1998. [DOI: 10.1021/jp982125k] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sofía Díaz-Moreno
- Instituto de Ciencia de Materiales, C.S.I.C-Universidad de Sevilla, c/Americo Vespucio, s/n 41092 Sevilla, Spain, Departamento de Química Física, Universidad de Sevilla, 41012 Sevilla, Spain, Department of Applied Chemistry, Faculty of Engineering, Yamanashi University, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan, and Department of Chemistry, Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, Japan
| | - José M. Martínez
- Instituto de Ciencia de Materiales, C.S.I.C-Universidad de Sevilla, c/Americo Vespucio, s/n 41092 Sevilla, Spain, Departamento de Química Física, Universidad de Sevilla, 41012 Sevilla, Spain, Department of Applied Chemistry, Faculty of Engineering, Yamanashi University, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan, and Department of Chemistry, Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, Japan
| | - Adela Muñoz-Páez
- Instituto de Ciencia de Materiales, C.S.I.C-Universidad de Sevilla, c/Americo Vespucio, s/n 41092 Sevilla, Spain, Departamento de Química Física, Universidad de Sevilla, 41012 Sevilla, Spain, Department of Applied Chemistry, Faculty of Engineering, Yamanashi University, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan, and Department of Chemistry, Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, Japan
| | - Hideto Sakane
- Instituto de Ciencia de Materiales, C.S.I.C-Universidad de Sevilla, c/Americo Vespucio, s/n 41092 Sevilla, Spain, Departamento de Química Física, Universidad de Sevilla, 41012 Sevilla, Spain, Department of Applied Chemistry, Faculty of Engineering, Yamanashi University, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan, and Department of Chemistry, Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, Japan
| | - Iwao Watanabe
- Instituto de Ciencia de Materiales, C.S.I.C-Universidad de Sevilla, c/Americo Vespucio, s/n 41092 Sevilla, Spain, Departamento de Química Física, Universidad de Sevilla, 41012 Sevilla, Spain, Department of Applied Chemistry, Faculty of Engineering, Yamanashi University, 4-3-11 Takeda, Kofu, Yamanashi 400-8511, Japan, and Department of Chemistry, Graduate School of Science, Osaka University, Machikaneyama 1-1, Toyonaka, Osaka 560-0043, Japan
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