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Hou GL, Liu CW, Li RZ, Xu HG, Gao YQ, Zheng WJ. Emergence of Solvent-Separated Na +-Cl - Ion Pair in Salt Water: Photoelectron Spectroscopy and Theoretical Calculations. J Phys Chem Lett 2017; 8:13-20. [PMID: 27935718 DOI: 10.1021/acs.jpclett.6b02670] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
Solvation of salts in water is a fundamental physical chemical process, but the underlying mechanism remains unclear. We investigated the contact ion pair (CIP) to solvent-separated ion pair (SSIP) transition in NaCl(H2O)n clusters with anion photoelectron spectroscopy and ab initio calculations. It is found that the SSIP type of structures show up at n = 2 for NaCl-(H2O)n anions. For neutral NaCl(H2O)n, the CIP structures are dominant at n < 9. At n = 9-12, the CIP structures and SSIP structures of NaCl(H2O)n are nearly degenerate in energy, coincident to the H2O:NaCl molar ratio of NaCl saturated solution and implying that the CIP and SSIP structures can coexist in concentrated solutions. These results are useful for understanding the solvation of salts at the molecular level.
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Affiliation(s)
- Gao-Lei Hou
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China
| | - Cheng-Wen Liu
- Beijing National Laboratory for Molecular Sciences, Institute of Theoretical and Computational Chemistry, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China
| | - Ren-Zhong Li
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China
| | - Hong-Guang Xu
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China
- University of Chinese Academy of Sciences , Beijing 100049, China
| | - Yi Qin Gao
- Beijing National Laboratory for Molecular Sciences, Institute of Theoretical and Computational Chemistry, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China
| | - Wei-Jun Zheng
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences , Beijing 100190, China
- University of Chinese Academy of Sciences , Beijing 100049, China
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2
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Affiliation(s)
- A. Subha Mahadevi
- Centre for Molecular Modelling, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad, India 500607
| | - G. Narahari Sastry
- Centre for Molecular Modelling, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad, India 500607
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3
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Kumbhar S, Jana S, Anoop A, Waller MP. Cooperativity in bimetallic glutathione complexes. J Mol Graph Model 2015; 62:1-10. [DOI: 10.1016/j.jmgm.2015.05.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 04/30/2015] [Accepted: 05/05/2015] [Indexed: 01/03/2023]
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4
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Nakayama Y, Andelman D. Differential capacitance of the electric double layer: The interplay between ion finite size and dielectric decrement. J Chem Phys 2015; 142:044706. [DOI: 10.1063/1.4906319] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Affiliation(s)
- Yasuya Nakayama
- Department of Chemical Engineering, Kyushu University, Nishi-ku, Fukuoka 819-0395, Japan
| | - David Andelman
- Raymond and Beverly Sackler School of Physics and Astronomy, Tel Aviv University, Ramat Aviv, Tel Aviv 69978, Israel
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5
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Shen H, Cheng W, Zhang FS. Structural conservation of the short α-helix in modified higher and lower polarity water solutions. RSC Adv 2015. [DOI: 10.1039/c4ra14739a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Which conformation is preferred when the polarity of water molecules is scaled byEP=ELJ+S2EC?
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Affiliation(s)
- Hao Shen
- The Key Laboratory of Beam Technology and Material Modification of the Ministry of Education
- College of Nuclear Science and Technology
- Beijing Normal University
- Beijing 100875
- China
| | - Wei Cheng
- The Key Laboratory of Beam Technology and Material Modification of the Ministry of Education
- College of Nuclear Science and Technology
- Beijing Normal University
- Beijing 100875
- China
| | - Feng-Shou Zhang
- The Key Laboratory of Beam Technology and Material Modification of the Ministry of Education
- College of Nuclear Science and Technology
- Beijing Normal University
- Beijing 100875
- China
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6
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Liu CW, Hou GL, Zheng WJ, Gao YQ. Adsorption of water molecules on sodium chloride trimer. Theor Chem Acc 2014. [DOI: 10.1007/s00214-014-1550-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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7
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Zhang Q, Zhang R, Zhao Y, Li H, Gao YQ, Zhuang W. Pairing preferences of the model mono-valence mono-atomic ions investigated by molecular simulation. J Chem Phys 2014; 140:184504. [DOI: 10.1063/1.4874255] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
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8
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Zhang R, Zhuang W. Cation effect in the ionic solution optical Kerr effect measurements: A simulation study. J Chem Phys 2014; 140:054507. [PMID: 24511952 DOI: 10.1063/1.4863696] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Ruiting Zhang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, People's Republic of China
| | - Wei Zhuang
- State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, People's Republic of China
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9
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Shen H, Cheng W, Zhang FS. Mixed-salt effects on the conformation of a short salt-bridge-forming α helix: a simulation study. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2014; 89:022717. [PMID: 25353518 DOI: 10.1103/physreve.89.022717] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2013] [Indexed: 06/04/2023]
Abstract
The structure of a single alanine-based ACE-AEAAAKEAAAKA-NH2 peptide in explicit aqueous solutions with mixed inorganic salts (NaCl and KCl) is investigated by using molecular simulations. The concentration of Na(+), c(Na(+)), varies from 0.0M to 1.0M, whereas the concentration of K(+) is 1-c(Na(+)). The simulated peptide is very sensitive to the change of concentration ratio between Na(+) and K(+). When the concentration ratio between Na^{+} and K^{+} is changed from 0.5/0.5, the structure of the peptide becomes loose or disordered. This specific phenomenon is confirmed via checking the changes of helix parameters and mapping the free energy along different coordinates. The higher normalized probability of forming direct and indirect salt bridges between residues Glu7(+) and Lys11(+) and the smallest probability of forming ringlike structures should be responsible for the stabilized helix structure in the 0.5 Na(+)/0.5 K(+) solution. Furthermore, a noticeable conformational transition from an extended helix to an α helix is found in the 0.5 Na(+)/0.5 K(+) solution, where a local ion cloud shows that some Na(+) ions in the inner shells are still directly binding with the peptide, while K(+) in the outer shells are moving into the inner shells, keeping the peptide in the collapsed state.
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Affiliation(s)
- Hao Shen
- The Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China and Beijing Radiation Center, Beijing 100875, China
| | - Wei Cheng
- The Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China and Beijing Radiation Center, Beijing 100875, China
| | - Feng-Shou Zhang
- The Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China and Beijing Radiation Center, Beijing 100875, China and Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, China
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10
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Liu CW, Wang F, Yang L, Li XZ, Zheng WJ, Gao YQ. Stable Salt–Water Cluster Structures Reflect the Delicate Competition between Ion–Water and Water–Water Interactions. J Phys Chem B 2014; 118:743-51. [DOI: 10.1021/jp408439j] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Cheng-Wen Liu
- Institute
of Theoretical and Computational Chemistry, College of Chemistry and
Molecular Engineering, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing 100871, China
| | - Feng Wang
- Department
of Chemistry and Biochemistry, University of Arkansas, Fayetteville, Arkansas 72701, United States
| | - Lijiang Yang
- Institute
of Theoretical and Computational Chemistry, College of Chemistry and
Molecular Engineering, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing 100871, China
| | - Xin-Zheng Li
- School
of Physics, Peking University, Beijing 100871, China
| | - Wei-Jun Zheng
- Beijing
National Laboratory for Molecular Sciences, State Key Laboratory of
Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Yi Qin Gao
- Institute
of Theoretical and Computational Chemistry, College of Chemistry and
Molecular Engineering, Beijing National Laboratory for Molecular Sciences, Peking University, Beijing 100871, China
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11
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Abstract
In cells, biological molecules function in an aqueous solution. Electrolytes and other small molecules play important roles in keeping the osmotic pressure of the cellular environment as well as the structure formation and function of biomolecules. The observed empirical rules such as Hofmeister series are still waiting for molecular interpretations. In this Perspective, we will discuss a simple and self-consistent theory that takes into account the cooperative effects of cations and anions in affecting water/air surface tension, water activity, and the solubility of model compounds including polypeptides. Molecular dynamics simulations used to test these theoretical models will also be discussed.
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Affiliation(s)
- Wen Jun Xie
- Institute of Theoretical and Computational Chemistry, College of Chemistry and Molecular Engineering, Peking National Laboratory for Molecular Sciences, Peking University, Beijing 100871, China
| | - Yi Qin Gao
- Institute of Theoretical and Computational Chemistry, College of Chemistry and Molecular Engineering, Peking National Laboratory for Molecular Sciences, Peking University, Beijing 100871, China
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12
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Xie W, Liu C, Yang L, Gao Y. On the molecular mechanism of ion specific Hofmeister series. Sci China Chem 2013. [DOI: 10.1007/s11426-013-5019-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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13
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Zhang R, Zhuang W. Effect of Ion Pairing on the Solution Dynamics Investigated by the Simulations of the Optical Kerr Effect and the Dielectric Relaxation Spectra. J Phys Chem B 2013; 117:15395-406. [DOI: 10.1021/jp404923y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Ruiting Zhang
- State Key
Lab of Molecular Reaction Dynamics, Dalian
Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
| | - Wei Zhuang
- State Key
Lab of Molecular Reaction Dynamics, Dalian
Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China
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14
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Li RZ, Liu CW, Gao YQ, Jiang H, Xu HG, Zheng WJ. Microsolvation of LiI and CsI in Water: Anion Photoelectron Spectroscopy and ab initio Calculations. J Am Chem Soc 2013; 135:5190-9. [PMID: 23432353 DOI: 10.1021/ja4006942] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ren-Zhong Li
- Beijing National Laboratory
for Molecular Sciences, State Key Laboratory of Molecular Reaction
Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Cheng-Wen Liu
- Beijing National Laboratory
for Molecular Sciences, Institute of Theoretical and Computational
Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yi Qin Gao
- Beijing National Laboratory
for Molecular Sciences, Institute of Theoretical and Computational
Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Hong Jiang
- Beijing National Laboratory
for Molecular Sciences, Institute of Theoretical and Computational
Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Hong-Guang Xu
- Beijing National Laboratory
for Molecular Sciences, State Key Laboratory of Molecular Reaction
Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
| | - Wei-Jun Zheng
- Beijing National Laboratory
for Molecular Sciences, State Key Laboratory of Molecular Reaction
Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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15
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Xie WJ, Gao YQ. Ion cooperativity and the effect of salts on polypeptide structure – a molecular dynamics study of BBA5 in salt solutions. Faraday Discuss 2013; 160:191-206; discussion 207-24. [DOI: 10.1039/c2fd20065a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Affiliation(s)
- Yi Qin Gao
- Institute of Theoretical
and Computational Chemistry,
College of Chemistry and Molecular Engineering, Peking National Laboratory
for Molecular Sciences, Peking University, Beijing, China, 100871
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