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Nair AS, Kumar S, Acharya S, Bagchi B. Rotation of small diatomics in water–ethanol mixture: Multiple breakdowns of hydrodynamic predictions. J Chem Phys 2020; 153:014504. [DOI: 10.1063/5.0005160] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Anjali S. Nair
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
| | - Shubham Kumar
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
| | - Subhajit Acharya
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
| | - Biman Bagchi
- Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560012, India
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2
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Banerjee P, Mondal D, Ghosh M, Mukherjee D, Nandi PK, Maiti TK, Sarkar N. Selective Self-Assembly of 5-Fluorouracil through Nonlinear Solvent Response Modulates Membrane Dynamics. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:2707-2719. [PMID: 32097563 DOI: 10.1021/acs.langmuir.9b03544] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Controllable self-assembly and understanding of the interaction between single metabolite fibrils and live-cell membranes have paramount importance in providing minimal treatment in several neurodegenerative disorders. Here, utilizing the nonlinear nature and peculiar hydrogen bonding behavior of the dimethyl sulfoxide (DMSO)-water mixture, the selective self-assembly of a single metabolite 5-fluorouracil (5-FU) is achieved. A direct correlation between water availability and selective self-assembly of 5-FU is ratified from the excited-state dynamics. The specific fibrillar structures of 5-FU exhibit a great potential to modulate live cell membrane fluidity and model membrane lipid distribution. After 5-FU fibril addition, a disorder of H-bonded water molecules arises several layers beyond the first hydration shell of the polar headgroups, which essentially modifies interfacial water structure and dynamics. Overall, our results shed light on the role of solvent to govern specific self-assembly and also lay the foundation accounting for the earlier stage of several diseases and multidrug resistance.
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Affiliation(s)
- Pavel Banerjee
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, West Bengal, India
| | - Dipankar Mondal
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, West Bengal, India
| | - Meghna Ghosh
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, West Bengal, India
| | - Devdeep Mukherjee
- Department of Biotechnology, Indian Institute of Technology Kharagpur, Kharagpur 721302, West Bengal, India
| | - Pratyush Kiran Nandi
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, West Bengal, India
| | - Tapas Kumar Maiti
- Department of Biotechnology, Indian Institute of Technology Kharagpur, Kharagpur 721302, West Bengal, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, West Bengal, India
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3
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Engelbrecht L, Mocci F, Laaksonen A, Koch KR. 195Pt NMR and Molecular Dynamics Simulation Study of the Solvation of [PtCl 6] 2- in Water-Methanol and Water-Dimethoxyethane Binary Mixtures. Inorg Chem 2018; 57:12025-12037. [PMID: 30215514 DOI: 10.1021/acs.inorgchem.8b01554] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The experimental 195Pt NMR chemical shift, δ(195Pt), of the [PtCl6]2- anion dissolved in binary mixtures of water and a fully miscible organic solvent is extremely sensitive to the composition of the mixture at room temperature. Significantly nonlinear δ(195Pt) trends as a function of solvent composition are observed in mixtures of water-methanol, or ethylene glycol, 2-methoxyethanol, and 1,2-dimethoxyethane (DME). The extent of the deviation from linearity of the δ(195Pt) trend depends strongly on the nature of the organic component in these solutions, which broadly suggests preferential solvation of the [PtCl6]2- anion by the organic molecule. This simplistic interpretation is based on an accepted view pertaining to monovalent cations in similar binary solvent mixtures. To elucidate these phenomena in detail, classical molecular dynamics computer simulations were performed for [PtCl6]2- in water-methanol and water-DME mixtures using the anionic charge scaling approach to account for the effect of electronic dielectric screening. Our simulations suggest that the simplistic model of preferential solvation of [PtCl6]2- by the organic component as inferred from nonlinear δ(195Pt) trends is not entirely accurate, particularly for water-DME mixtures. The δ(195Pt) trend in these mixtures levels off for high DME mole fractions, which results from apparent preferential location of [PtCl6]2- anions at the borders of water-rich regions or clusters within these inherently micro-heterogeneous mixtures. By contrast in water-methanol mixtures, apparently less pronounced mixed solvent micro-heterogeneity is found, suggesting the experimental δ(195Pt) trend is consistent with a more moderate preferential solvation of [PtCl6]2- anions. This finding underlines the important role of solvent-solvent interactions and micro-heterogeneity in determining the solvation environment of [PtCl6]2- anions in binary solvent mixtures, probed by highly sensitive 195Pt NMR. The notion that preferential solvation of [PtCl6]2- results primarily from competing ion-solvent interactions as generally assumed for monatomic ions, may not be appropriate in general.
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Affiliation(s)
- Leon Engelbrecht
- Department of Chemistry and Polymer Science , Stellenbosch University , Private Bag X1 , Matieland 7602 , South Africa.,Department of Chemical and Geological Sciences , University of Cagliari , I-09042 Monserrato , Italy.,Division of Physical Chemistry, Department of Materials and Environmental Chemistry, Arrhenius Laboratory , Stockholm University , 10691 Stockholm , Sweden
| | - Francesca Mocci
- Department of Chemical and Geological Sciences , University of Cagliari , I-09042 Monserrato , Italy
| | - Aatto Laaksonen
- Division of Physical Chemistry, Department of Materials and Environmental Chemistry, Arrhenius Laboratory , Stockholm University , 10691 Stockholm , Sweden.,Department of Chemistry-Ångström Laboratory , Uppsala University , Box 538, SE-75121 Uppsala , Sweden
| | - Klaus R Koch
- Department of Chemistry and Polymer Science , Stellenbosch University , Private Bag X1 , Matieland 7602 , South Africa
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4
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Krishnamoorthy AN, Zeman J, Holm C, Smiatek J. Preferential solvation and ion association properties in aqueous dimethyl sulfoxide solutions. Phys Chem Chem Phys 2018; 18:31312-31322. [PMID: 27824183 DOI: 10.1039/c6cp05909k] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
We study the solvation and the association properties of ion pairs in aqueous dimethyl sulfoxide (DMSO) solution by atomistic molecular dynamics (MD) simulations. The ion pair is composed of two lithium and a single sulfonated diphenyl sulfone ion whose properties are studied under the influence of different DMSO concentrations. For increasing mole fractions of DMSO, we observe a non-ideal behavior of the solution as indicated by the derivatives of the chemical activity. Our findings are complemented by dielectric spectra, which also verify a complex DMSO-water mixing behavior. In agreement with these results, further simulation outcomes reveal an aqueous homoselective solvation of the ion species which fosters the occurrence of pronounced ion association constants at higher DMSO mole fractions. The consequences of this finding are demonstrated by lower ionic conductivities for increasing concentrations of DMSO.
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Affiliation(s)
| | - Johannes Zeman
- Institute for Computational Physics, University of Stuttgart, D-70569 Stuttgart, Germany.
| | - Christian Holm
- Institute for Computational Physics, University of Stuttgart, D-70569 Stuttgart, Germany.
| | - Jens Smiatek
- Institute for Computational Physics, University of Stuttgart, D-70569 Stuttgart, Germany.
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5
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Dixit MK, Hajari T, Tembe BL. Solvation structures of sodium halides in dimethyl sulfoxide (DMSO)–methanol (MeOH) mixtures. MOLECULAR SIMULATION 2016. [DOI: 10.1080/08927022.2016.1241396] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- M. K. Dixit
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, India
| | - Timir Hajari
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, India
| | - B. L. Tembe
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, India
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Lam RK, Smith JW, Saykally RJ. Communication: Hydrogen bonding interactions in water-alcohol mixtures from X-ray absorption spectroscopy. J Chem Phys 2016; 144:191103. [DOI: 10.1063/1.4951010] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Royce K. Lam
- Department of Chemistry, University of California, Berkeley, California 94720, USA and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Jacob W. Smith
- Department of Chemistry, University of California, Berkeley, California 94720, USA and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - Richard J. Saykally
- Department of Chemistry, University of California, Berkeley, California 94720, USA and Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
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7
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Kelley MP, Yang P, Clark SB, Clark AE. Structural and Thermodynamic Properties of the CmIII Ion Solvated by Water and Methanol. Inorg Chem 2016; 55:4992-9. [DOI: 10.1021/acs.inorgchem.6b00477] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Morgan P. Kelley
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States
- Theoretical
Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, United States
| | - Ping Yang
- Theoretical
Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87544, United States
| | - Sue B. Clark
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States
| | - Aurora E. Clark
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States
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8
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Kelley M, Donley A, Clark S, Clark A. Structure and Dynamics of NaCl Ion Pairing in Solutions of Water and Methanol. J Phys Chem B 2015; 119:15652-61. [DOI: 10.1021/acs.jpcb.5b07492] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Morgan Kelley
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States
| | - Amber Donley
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States
| | - Sue Clark
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States
| | - Aurora Clark
- Department of Chemistry, Washington State University, Pullman, Washington 99164, United States
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9
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Zhuang B, Wang ZG. A molecularly based theory for electron transfer reorganization energy. J Chem Phys 2015; 143:224502. [PMID: 26671385 DOI: 10.1063/1.4936586] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Using field-theoretic techniques, we develop a molecularly based dipolar self-consistent-field theory (DSCFT) for charge solvation in pure solvents under equilibrium and nonequilibrium conditions and apply it to the reorganization energy of electron transfer reactions. The DSCFT uses a set of molecular parameters, such as the solvent molecule's permanent dipole moment and polarizability, thus avoiding approximations that are inherent in treating the solvent as a linear dielectric medium. A simple, analytical expression for the free energy is obtained in terms of the equilibrium and nonequilibrium electrostatic potential profiles and electric susceptibilities, which are obtained by solving a set of self-consistent equations. With no adjustable parameters, the DSCFT predicts activation energies and reorganization energies in good agreement with previous experiments and calculations for the electron transfer between metallic ions. Because the DSCFT is able to describe the properties of the solvent in the immediate vicinity of the charges, it is unnecessary to distinguish between the inner-sphere and outer-sphere solvent molecules in the calculation of the reorganization energy as in previous work. Furthermore, examining the nonequilibrium free energy surfaces of electron transfer, we find that the nonequilibrium free energy is well approximated by a double parabola for self-exchange reactions, but the curvature of the nonequilibrium free energy surface depends on the charges of the electron-transferring species, contrary to the prediction by the linear dielectric theory.
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Affiliation(s)
- Bilin Zhuang
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA
| | - Zhen-Gang Wang
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, USA
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10
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Keshri S, Sarkar A, Tembe BL. Molecular Dynamics Simulation of Na+–Cl– Ion-Pair in Water–Methanol Mixtures under Supercritical and Ambient Conditions. J Phys Chem B 2015; 119:15471-84. [DOI: 10.1021/acs.jpcb.5b05401] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sonanki Keshri
- Department
of Chemistry, Indian Institute of Technology, Bombay, Powai, Mumbai, 400076, India
| | - Atanu Sarkar
- 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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11
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Curotto E. Ion-Stockmayer clusters: Minima, classical thermodynamics, and variational ground state estimates of Li+(CH3NO2)n(n= 1–20). J Chem Phys 2015; 143:214301. [DOI: 10.1063/1.4936587] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- E. Curotto
- Department of Chemistry and Physics, Arcadia University, Glenside, Pennsylvania 19038-3295, USA
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12
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Virk AS, Codling DJ, Stait-Gardner T, Price WS. Non-Ideal Behaviour and Solution Interactions in Binary DMSO Solutions. Chemphyschem 2015; 16:3814-23. [DOI: 10.1002/cphc.201500670] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Indexed: 01/24/2023]
Affiliation(s)
- Amninder S. Virk
- Nanoscale Organisation and Dynamics Group; School of Science and Health; University of Western Sydney; Locked Bag 1797 Penrith NSW 2751 Australia
| | - Dale J. Codling
- Nanoscale Organisation and Dynamics Group; School of Science and Health; University of Western Sydney; Locked Bag 1797 Penrith NSW 2751 Australia
| | - Timothy Stait-Gardner
- Nanoscale Organisation and Dynamics Group; School of Science and Health; University of Western Sydney; Locked Bag 1797 Penrith NSW 2751 Australia
| | - William S. Price
- Nanoscale Organisation and Dynamics Group; School of Science and Health; University of Western Sydney; Locked Bag 1797 Penrith NSW 2751 Australia
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13
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Banik D, Kundu N, Kuchlyan J, Roy A, Banerjee C, Ghosh S, Sarkar N. Picosecond solvation dynamics—A potential viewer of DMSO—Water binary mixtures. J Chem Phys 2015; 142:054505. [DOI: 10.1063/1.4906541] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Debasis Banik
- Department of Chemistry, Indian Institute of Technology, Kharagpur, WB 721302, India
| | - Niloy Kundu
- Department of Chemistry, Indian Institute of Technology, Kharagpur, WB 721302, India
| | - Jagannath Kuchlyan
- Department of Chemistry, Indian Institute of Technology, Kharagpur, WB 721302, India
| | - Arpita Roy
- Department of Chemistry, Indian Institute of Technology, Kharagpur, WB 721302, India
| | - Chiranjib Banerjee
- Department of Chemistry, Indian Institute of Technology, Kharagpur, WB 721302, India
| | - Surajit Ghosh
- Department of Chemistry, Indian Institute of Technology, Kharagpur, WB 721302, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur, WB 721302, India
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14
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Kuchlyan J, Banik D, Roy A, Kundu N, Sarkar N. Excited-State Proton Transfer Dynamics of Firefly’s Chromophore D-Luciferin in DMSO–Water Binary Mixture. J Phys Chem B 2014; 118:13946-53. [PMID: 25415652 DOI: 10.1021/jp510389d] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Jagannath Kuchlyan
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Debasis Banik
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Arpita Roy
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Niloy Kundu
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
| | - Nilmoni Sarkar
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, West Bengal, India
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15
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Effects of methanol on the hydrogen bonding structure and dynamics in aqueous N-methylacetamide solution. J Mol Liq 2014. [DOI: 10.1016/j.molliq.2014.01.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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16
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Roy S, Bagchi B. Solvation dynamics of tryptophan in water-dimethyl sulfoxide binary mixture: In search of molecular origin of composition dependent multiple anomalies. J Chem Phys 2013; 139:034308. [DOI: 10.1063/1.4813417] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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17
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Long Y, Wang T, Liu L, Liu G, Zhang G. Ion specificity at a low salt concentration in water-methanol mixtures exemplified by a growth of polyelectrolyte multilayer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:3645-3653. [PMID: 23425248 DOI: 10.1021/la400035e] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
By use of a quartz crystal microbalance with dissipation (QCM-D), we have investigated the specific ion effect on the growth of poly(sodium 2-acrylamido-2-methylpropanesulfonate)/poly(diallyldimethylammonium chloride) multilayer at a salt concentration as low as 2.0 mM in water-methanol mixtures. QCM-D results demonstrate that specific ion effect can be observed in methanol and water-methanol mixtures though it is negligible in water. Moreover, the specific ion effect is amplified as the molar fraction of methanol (xM) increases from 0% to 75% but is weakened again with the further increase of xM from 75% to 100%. Nuclear magnetic resonance measurements reveal that the counterion-polyelectrolyte segment interactions may not account for the observed ion specificity. By extending the Collins' concept of matching water affinities to methanol and water-methanol mixtures, we suggest that the ion-solvent interactions and the resulted counterion-charged group interactions are responsible for the occurrence of the specific ion effect. The conductivity measurements indicate that water and methanol molecules may form complexes, and the change of relative proportion of complexes with the xM causes the amplification or weakening of the specific ion effect.
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Affiliation(s)
- Yunchao Long
- Department of Chemical Physics, Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, PR China 230026
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GUPTA RINI, CHANDRA AMALENDU. SINGLE-PARTICLE AND PAIR DYNAMICAL PROPERTIES OF ACETONE–METHANOL MIXTURES CONTAINING CHARGED AND NEUTRAL SOLUTES: A MOLECULAR DYNAMICS STUDY. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2012. [DOI: 10.1142/s0219633611006438] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The dynamical properties of acetone–methanol mixtures containing either an ionic or a neutral hydrophobic solute are investigated by means of a series of molecular dynamics simulations. The primary goal has been to study how the solute and solvent dynamical properties change with variation of composition of the mixture ranging from pure acetone to pure methanol. The variations of structure and energetics of the mixture with composition are also calculated. The diffusion coefficients of both ionic and neutral solutes are found to show nonlinear variation with composition of the mixture, although the extent of nonlinearity in the diffusion of the neutral solute is much weaker. Calculations of appropriate solute-solvent distribution functions reveal the extent and nature of selective solvation of these solute species which play a role in determining the nonideal dynamical characteristics of these solutes. The free energies of solvation of the ionic solutes are also calculated and the results are discussed in the context of their dynamical behavior. The hydrogen bond statistics and dynamics of these mixtures are also calculated over their entire composition range. The energies and lifetimes of hydrogen bonds between an acetone and a methanol molecule or between two methanol molecules are found to increase with increase of acetone mole fraction of the mixture. Residence times of methanol molecules in solvation shells of acetone and methanol are also found to follow the same trend as relaxation times. However, these pair dynamical properties show essentially linear dependence on composition, thus behave almost ideally with respect to changes in composition of the mixture.
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Affiliation(s)
- RINI GUPTA
- Department of Chemistry, Indian Institute of Technology, Kanpur, India 208016, India
| | - AMALENDU CHANDRA
- Department of Chemistry, Indian Institute of Technology, Kanpur, India 208016, India
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Wang T, Liu G, Zhang G, Craig VSJ. Insights into ion specificity in water-methanol mixtures via the reentrant behavior of polymer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:1893-1899. [PMID: 22185337 DOI: 10.1021/la203979d] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
In the present work, we have for the first time systematically investigated the ion specific reentrant behavior of poly(N-isopropylacryamide) (PNIPAM) in water-methanol mixtures. Turbidity measurements demonstrate that SCN(-) and ClO(4)(-) depress the reentrant transition, whereas other anions enhance the transition. As the anion changes from chaotropic to kosmotropic, the minimum critical phase transition temperature (T(min)) decreases and the corresponding volume fraction of methanol (X(M)) shifts to a larger value. Our results demonstrate that anion specificity is due to the anionic structure making/breaking effect on water/methanol complexes. Cations are found to have a lesser but still significant effect on the reentrant transition, and as T(min) decreases the corresponding X(M) also shifts to larger values as with the anions. Our studies show that cation specificity is induced by specific interactions between cations and PNIPAM chains. Furthermore, both anion and cation specificities are amplified as X(M) is increased due to the formation of additional water/methanol complexes. Calorimetry measurements demonstrate that the ion specificity is dominated by changes in entropy.
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Affiliation(s)
- Tao Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei, PR China 230026
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20
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Chakraborty D, Chandra A. Voids and necks in liquid ammonia and their roles in diffusion of ions of varying size. J Comput Chem 2012; 33:843-52. [DOI: 10.1002/jcc.22910] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2011] [Revised: 10/30/2011] [Accepted: 11/20/2011] [Indexed: 11/05/2022]
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21
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Sun X, Stratt RM. The molecular underpinnings of a solute-pump/solvent-probe spectroscopy: the theory of polarizability response spectra and an application to preferential solvation. Phys Chem Chem Phys 2012; 14:6320-31. [DOI: 10.1039/c2cp24127g] [Citation(s) in RCA: 7] [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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22
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YOSHIMORI AKIRA. TIME DEPENDENT DENSITY FUNCTIONAL METHODS AND THEIR APPLICATION TO CHEMICAL PHYSICS. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2011. [DOI: 10.1142/s0219633604000878] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
This article reviews microscopic development of time dependent functional method and its application to chemical physics. It begins with the formulation of density functional theory. The time dependent extension is discussed after the equilibrium formulation. Its application is explained by solvation dynamics. In addition, it reviews studies of nonlinear effects on polar liquids and simple mixtures.
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Affiliation(s)
- AKIRA YOSHIMORI
- Department of Physics, Kyushu University, Fukuoka, 812-8581, Japan
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23
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Basilevsky M, Odinokov A, Nikitina E, Petrov N. The dielectric continuum solvent model adapted for treating preferential solvation effects. J Electroanal Chem (Lausanne) 2011. [DOI: 10.1016/j.jelechem.2010.09.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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24
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Gupta R, Chandra A. Nonideality in diffusion of ionic and neutral solutes and hydrogen bond dynamics in dimethyl sulfoxide-chloroform mixtures of varying composition. J Comput Chem 2011; 32:2679-89. [DOI: 10.1002/jcc.21849] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2010] [Revised: 04/14/2011] [Accepted: 05/10/2011] [Indexed: 12/11/2022]
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25
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Nguyen CN, Stratt RM. Preferential solvation dynamics in liquids: How geodesic pathways through the potential energy landscape reveal mechanistic details about solute relaxation in liquids. J Chem Phys 2010; 133:124503. [DOI: 10.1063/1.3481655] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
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26
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27
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Basilevsky M, Odinokov A, Nikitina E, Grigoriev F, Petrov N, Alfimov M. Preferential solvation of spherical ions in binary DMSO/benzene mixtures. J Chem Phys 2009; 130:024504. [DOI: 10.1063/1.3010707] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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28
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Swalina C, Arzhantsev S, Li H, Maroncelli M. Solvation and Solvatochromism in CO2-Expanded Liquids. 3. The Dynamics of Nonspecific Preferential Solvation. J Phys Chem B 2008; 112:14959-70. [DOI: 10.1021/jp805620q] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Chet Swalina
- Department of Chemistry, Penn State University, 104 Chemistry Building, University Park, Pennsylvania 16802
| | - Sergei Arzhantsev
- Department of Chemistry, Penn State University, 104 Chemistry Building, University Park, Pennsylvania 16802
| | - Hongping Li
- Department of Chemistry, Penn State University, 104 Chemistry Building, University Park, Pennsylvania 16802
| | - Mark Maroncelli
- Department of Chemistry, Penn State University, 104 Chemistry Building, University Park, Pennsylvania 16802
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Rodriguez J, Martí J, Guàrdia E, Laria D. Exploring the Picosecond Time Domain of the Solvation Dynamics of Coumarin 153 within β-Cyclodextrins. J Phys Chem B 2008; 112:8990-8. [DOI: 10.1021/jp8023765] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Javier Rodriguez
- Departamento de Física, Comisión Nacional de Energia Atómica, Avenida Libertador 8250, 1429, Buenos Aires, Argentina, Departamento de Química Inorgánica, Analítica y Química-Física e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428, Buenos Aires, Argentina, and Departament de Fısica i Enginyeria Nuclear, Universitat Politecnica de Catalunya, B4-B5 Campus Nord 08034, Barcelona, Spain
| | - Jordi Martí
- Departamento de Física, Comisión Nacional de Energia Atómica, Avenida Libertador 8250, 1429, Buenos Aires, Argentina, Departamento de Química Inorgánica, Analítica y Química-Física e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428, Buenos Aires, Argentina, and Departament de Fısica i Enginyeria Nuclear, Universitat Politecnica de Catalunya, B4-B5 Campus Nord 08034, Barcelona, Spain
| | - Elvira Guàrdia
- Departamento de Física, Comisión Nacional de Energia Atómica, Avenida Libertador 8250, 1429, Buenos Aires, Argentina, Departamento de Química Inorgánica, Analítica y Química-Física e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428, Buenos Aires, Argentina, and Departament de Fısica i Enginyeria Nuclear, Universitat Politecnica de Catalunya, B4-B5 Campus Nord 08034, Barcelona, Spain
| | - Daniel Laria
- Departamento de Física, Comisión Nacional de Energia Atómica, Avenida Libertador 8250, 1429, Buenos Aires, Argentina, Departamento de Química Inorgánica, Analítica y Química-Física e INQUIMAE, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428, Buenos Aires, Argentina, and Departament de Fısica i Enginyeria Nuclear, Universitat Politecnica de Catalunya, B4-B5 Campus Nord 08034, Barcelona, Spain
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30
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Gupta R, Chandra A. Single particle and pair dynamics in water–formic acid mixtures containing ionic and neutral solutes: Nonideality in dynamical properties. J Chem Phys 2008; 128:184506. [DOI: 10.1063/1.2913058] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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31
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Pradhan T, Ghoshal P, Biswas R. Structural transition in alcohol-water binary mixtures: A spectroscopic study. J CHEM SCI 2008. [DOI: 10.1007/s12039-008-0033-0] [Citation(s) in RCA: 81] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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32
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Duncombe BJ, Rydén JOS, Puskar L, Cox H, Stace AJ. A gas-phase study of the preferential solvation of Mn(2+) in mixed water/methanol clusters. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2008; 19:520-530. [PMID: 18258449 DOI: 10.1016/j.jasms.2007.12.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2007] [Revised: 12/06/2007] [Accepted: 12/10/2007] [Indexed: 05/25/2023]
Abstract
The kinetic shift that exists between two competing unimolecular fragmentation processes has been used to establish whether or not gas-phase Mn(2+) exhibits preferential solvation when forming mixed clusters with water and methanol. Supported by molecular orbital calculations, these first results for a metal dication demonstrate that Mn(2+) prefers to be solvated by methanol in the primary solvation shell.
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Affiliation(s)
- Bridgette J Duncombe
- Department of Physical Chemistry, School of Chemistry, University of Nottingham, University Park, Nottingham, UK
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33
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Tiftickjian CN, Egorov SA. Absorption and emission lineshapes and solvation dynamics of NO in supercritical Ar. J Chem Phys 2008; 128:114501. [PMID: 18361585 DOI: 10.1063/1.2840348] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
We perform a theoretical study of electronic spectroscopy of dilute NO in supercritical Ar fluid. Absorption and emission lineshapes for the A(2)Sigma(+)<--X(2)Pi Rydberg transition of NO in argon have been previously measured and simulated, which yielded results for the NO/Ar ground- and excited-state pair potentials [Larregaray et al., Chem. Phys. 308, 13 (2005)]. Using these potentials, we have performed molecular dynamics simulations and theoretical statistical mechanical calculations of absorption and emission lineshapes and nonequilibrium solvation correlation functions for a wide range of solvent densities and temperatures. Theory was shown to be in good agreement with simulation. Linear response treatment of solvation dynamics was shown to break down at near-critical temperature due to dramatic change in the solute-solvent microstructure upon solute excitation to the Rydberg state and the concomitant increase of the solute size.
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34
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Pradhan T, Ghoshal P, Biswas R. Excited State Intramolecular Charge Transfer Reaction in Binary Mixtures of Water and Tertiary Butanol (TBA): Alcohol Mole Fraction Dependence. J Phys Chem A 2008; 112:915-24. [DOI: 10.1021/jp0770460] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Tuhin Pradhan
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India
| | - Piue Ghoshal
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India
| | - Ranjit Biswas
- Department of Chemical, Biological and Macromolecular Sciences, and Unit for Nanoscience and Technology, S. N. Bose National Centre for Basic Sciences, JD Block, Sector III, Salt Lake City, Kolkata 700 098, India
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35
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Non-ideality in Born-free energy of solvation in alcohol-water and dimethylsulfoxide-acetonitrile mixtures: Solvent size ratio and ion size dependence. J CHEM SCI 2008. [DOI: 10.1007/s12039-007-0051-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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36
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Kashyap HK, Biswas R. Ions in a binary asymmetric dipolar mixture: Mole fraction dependent Born energy of solvation and partial solvent polarization structure. J Chem Phys 2007; 127:184502. [DOI: 10.1063/1.2792953] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
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37
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Gupta R, Chandra A. Nonideality in diffusion of ionic and hydrophobic solutes and pair dynamics in water-acetone mixtures of varying composition. J Chem Phys 2007; 127:024503. [PMID: 17640133 DOI: 10.1063/1.2751192] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Abstract
We have performed a series of molecular dynamics simulations of water-acetone mixtures containing either an ionic solute or a neutral hydrophobic solute to study the extent of nonideality in the dynamics of these solutes with variation of composition of the mixtures. The diffusion coefficients of the charged solutes, both cationic and anionic, are found to change nonmonotonically with the composition of the mixtures showing strong nonideality of their dynamics. Also, the extent of nonideality in the diffusion of these charged solutes is found to be similar to the nonideality that is observed for the diffusion and orientational relaxation of water and acetone molecules in these mixtures which show a somewhat similar changes in the solvation characteristics of charged and dipolar solutes with changes of composition of water-acetone mixtures. The diffusion of the hydrophobic solute, however, shows a monotonic increase with increase of acetone concentration showing its different solvation characteristics as compared to the charged and dipolar solutes. The links between the nonideality in diffusion and solvation structures are further confirmed through calculations of the relevant solute-solvent and solvent-solvent radial distribution functions for both ionic and hydrophobic solutes. We have also calculated various pair dynamical properties such as the relaxation of water-water and acetone-water hydrogen bonds and residence dynamics of water molecules in water and acetone hydration shells. The lifetimes of both water-water and acetone-water hydrogen bonds and also the residence times of water molecules are found to increase steadily with increase in acetone concentration. No maximum or minimum was found in the composition dependence of these pair dynamical quantities. The lifetimes of water-water hydrogen bonds are always found to be longer than that of acetone-water hydrogen bonds in these mixtures. The residence times of water molecules are also found to follow a similar trend.
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Affiliation(s)
- Rini Gupta
- Department of Chemistry, Indian Institute of Technology, Kanpur, India 208016
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38
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Sando GM, Dahl K, Owrutsky JC. Vibrational Spectroscopy and Dynamics of Azide Ion in Ionic Liquid and Dimethyl Sulfoxide Water Mixtures. J Phys Chem B 2007; 111:4901-9. [PMID: 17388412 DOI: 10.1021/jp067143d] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Steady-state and time-resolved infrared spectroscopy of the azide (N(3)-) anion has been used to characterize aqueous mixtures both with the ionic liquid (IL) 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF(4)]) and with dimethyl sulfoxide (DMSO). In the DMSO-water mixtures, two anion vibrational bands are observed for low water mole fractions (0 > X(w) > 0.25), which indicates a heterogeneous ion solvation environment. The band at 2000 cm(-1) observed for neat DMSO does not shift but decreases in amplitude as the amount of water is increased. Another band appears at slightly higher frequency at low X(w) (=0.05). As the amount of water is increased, this band shifts to higher frequency and becomes stronger and is attributed to azide with an increasing degree of hydration. At intermediate and high X(w), a single band is observed that shifts almost linearly with water mole fraction toward the bulk water value. The heterogeneity is evident from the infrared pump-probe studies in which the decay times depend on probe frequency at low mole fraction. For the azide spectra in IL-water mixtures, a single azide band is observed for each mole fraction mixture. The azide band shifts almost linearly with mole fraction, indicating nearly ideal mixing behavior. As with the DMSO-water mixtures, the time-resolved IR decay times are probe-frequency-dependent at low mole fraction, again indicating heterogeneous solvation. In both the DMSO and IL mixtures with water, the relaxation times are slower than would be expected from ideal mixing, suggesting that vibrational relaxation of azide is more sensitive than its vibrational frequency to the solvent structure. The results are discussed in terms of preferential solvation and the degree to which the azide shift and vibrational relaxation depend on the degree of water association in the mixtures.
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Affiliation(s)
- Gerald M Sando
- U.S. Naval Research Laboratory, Washington, District of Columbia 20375-5342, USA
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39
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Murata S, Yoshimori A. Nonlinear effects on solvation dynamics in simple mixtures. J Chem Phys 2006; 125:244501. [PMID: 17199349 DOI: 10.1063/1.2409713] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
The authors applied the time dependent density functional method (TDDFM) and a linear model to solvation dynamics in simple binary solvents. Changing the solute-solvent interactions at t=0, the authors calculated the time evolution of density fields for solvent particles after the change (t>0) by the TDDFM and linear model. First, the authors changed the interaction of only one component of solvents. In this case, the TDDFM showed that the solvation time decreased monotonically with a mole fraction of the solvent strongly interacting with the solute. The monotonical decreases agreed with experimental results, while the linear model did not reproduce these results. The authors also calculated the solvation time by changing the interaction of both components. The calculation showed that the mole fraction dependence had the peak. The TDDFM presented a much higher peak than the linear model. The difference between the TDDFM and the linear model was caused by a nonlinear effect on an exchange process of solvent particles.
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Affiliation(s)
- Shuhei Murata
- Department of Physics, Kyushu University, Fukuoka 812-8581, Japan
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40
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Chowdhuri S, Chandra A. Solute size effects on the solvation structure and diffusion of ions in liquid methanol under normal and cold conditions. J Chem Phys 2006; 124:084507. [PMID: 16512729 DOI: 10.1063/1.2172598] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
We have performed a series of molecular dynamics simulations of alkali metal (Li+, Na+, K+, Rb+, and Cs+) and halide (F-, Cl-, Br-, and I-) ions in liquid methanol at two different temperatures to investigate the effects of ion size on the hydration structure and diffusion of ions in methanol under normal and cold conditions. Simulations are also carried out for some of the larger cations such as I+, (CH3)4N+, and (C2H5)4N+ and also neutral alkali metal atoms in methanol at both temperatures. With the increase of ion size, the diffusion coefficients of both positive and negative ions are found to show anomalous behavior. For cations, it is found that the maximum of the diffusion coefficient versus ion size curve occurs at the rather large cation of (CH3)4N+ unlike in water where the maximum occurs at the relatively smaller ion of Rb+. For halide ions, the anomalous behavior, i.e., the increase of diffusion with ion size, continues up to iodide ion and no maximum is observed. These results are in good agreement with experimental observations. The diffusion coefficients of neutral atoms are found to be greater in methanol than that in water and they decrease monotonically with solute size, whereas the diffusion coefficients of the corresponding ions are found to be smaller in methanol. Accordingly, an ion experiences a smaller Stokes friction and a higher dielectric friction in methanol than in water. These contrasting effects are believed to be responsible for the shift of the maximum of ion diffusion toward a larger ion size when compared with similar anomalous size dependence in liquid water.
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Affiliation(s)
- Snehasis Chowdhuri
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
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41
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Affiliation(s)
- Ilan Benjamin
- Department of Chemistry, University of California, Santa Cruz, California 95064, USA
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42
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Ladanyi BM, Nugent S. The effects of solute-solvent electrostatic interactions on solvation dynamics in supercritical CO2. J Chem Phys 2006; 124:044505. [PMID: 16460183 DOI: 10.1063/1.2148967] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
We present here the results of molecular-dynamics simulation of solvation dynamics in supercritical CO(2) at a temperature of about 1.05T(c), where T(c) is the critical temperature, and at a series of densities ranging from 0.4 to 2.0 of the critical density rho(c). We focus on electrostatic solvation dynamics, representing the electronic excitation of the chromophore as a change in its charge distribution from a quadrupolar-symmetry ground state to a dipolar excited state. Two perturbations are considered, corresponding to different magnitudes of solute excited-state dipoles, denoted as d5 and d8. The d8 solute is more attractive, leading to a larger enhancement in CO(2) clustering upon solute electronic excitation. This has a large impact on solvation dynamics, especially at densities below rho(c). At these densities, solvation dynamics is much slower for the d8 than for the d5 solute. For both solutes, solvation dynamics becomes faster at densities above rho(c) at which solvent clustering diminishes. We show that the slowest solvation time scale is associated with solvent clustering and we relate it to solute-solvent mutual translational diffusion and the extent of change in effective local density resulting from solute electronic excitation.
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Affiliation(s)
- Branka M Ladanyi
- Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523, USA.
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43
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Chowdhuri S, Chandra A. Dynamics of ionic and hydrophobic solutes in water-methanol mixtures of varying composition. J Chem Phys 2005; 123:234501. [PMID: 16392925 DOI: 10.1063/1.2137702] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We have carried out a series of molecular-dynamics simulations of water-methanol mixtures containing either an ionic or a neutral atomic solute to investigate the effects of composition of the mixture on the diffusion of these solutes. Altogether, we have considered 17 different systems of varying composition ranging from pure water to pure methanol. The diffusion coefficients of ionic solutes are found to show nonideal behavior with variation of composition of the solvent mixture. The extent of nonideality of the solute diffusion is found to be similar to the nonideality that is observed for the diffusion and orientational relaxation of water and methanol molecules in these mixtures and is attributed to the enhanced stability of the hydrogen bonds and formation of interspecies complexes in the mixtures. The neutral solute shows characteristics of hydrophobic solvation and its diffusion decreases monotonically with increase of methanol concentration. The present simulation results are compared with those of experiments wherever available.
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Affiliation(s)
- Snehasis Chowdhuri
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
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44
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Paul S, Chandra A. Hydrogen Bond Properties and Dynamics of Liquid−Vapor Interfaces of Aqueous Methanol Solutions. J Chem Theory Comput 2005; 1:1221-31. [DOI: 10.1021/ct050098d] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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45
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Vechi SM, Skaf MS. Molecular-dynamics simulations of dimethylsulfoxide-methanol mixtures. J Chem Phys 2005; 123:154507. [PMID: 16252962 DOI: 10.1063/1.2085052] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present molecular-dynamics (MD) computer simulation results for the local structures, hydrogen (H)-bond distribution, and dynamical properties of methanol (MeOH) and dimethylsulfoxide (DMSO) binary mixtures at ambient conditions over the entire composition range. The simulated heat of mixing and site-site pair distribution functions suggest that the intermolecular structures of the pure liquids are not markedly altered upon mixing. Nevertheless, H-bonding statistics show that aggregates of the type 1DMSO:1MeOH are formed and represent the predominant form of molecular association in these mixtures. Only a small fraction (10%) of DMSO molecules in MeOH-rich mixtures (85% in mole) forms H-bonding trimers of type 1DMSO:2MeOH. No evidence of other types of interspecies association is found. The self-diffusion coefficient for DMSO (MeOH) increases (decreases) upon mixing. The characteristic reorientation time tau1 of both species increases in the mixture, but the composition dependence is weak. The frequency spectrum of MeOH reorientational time-correlation function shows significant redshifts of the principal librational band as DMSO is added to the system, whereas the librational band of DMSO shows small alterations upon mixing. Our results are discussed in the light of previous simulation analyses for a similar system, DMSO-water mixtures, and compared with available experimental results.
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Affiliation(s)
- Sérgio M Vechi
- Institute of Chemistry, State University of Campinas (UNICAMP), Caixa Postal 6154, Campinas, Sao Paolo 13083-970, Brazil
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46
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Sahu K, Mondal SK, Roy D, Karmakar R, Bhattacharyya K. Slow solvation dynamics of 4-AP and DCM in binary mixtures. J Photochem Photobiol A Chem 2005. [DOI: 10.1016/j.jphotochem.2004.12.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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47
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Sakurai M, Yoshimori A. Bandwidth analysis of solvation dynamics in a simple liquid mixture. J Chem Phys 2005; 122:104509. [PMID: 15836334 DOI: 10.1063/1.1857480] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The time-dependent energy distribution of solvation dynamics is studied by molecular dynamics simulations of a Lennard-Jones mixture. We calculate the response functions of the average and the variance which correspond to the spectral peak shift and bandwidth. Our calculation shows that the variance relaxation is slower than that of the average. The result agrees qualitatively with the experimental results. Dividing the obtained response functions into subcomponents caused by each solvent, we find that the relaxation is dominated by that solvent which strongly interacts with the solute. Extracting the redistribution component from the response functions, we find that it causes the slower relaxation of the response function. Thus, we conclude that the difference of the slower relaxations between the average and variance is caused by the redistribution process.
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Affiliation(s)
- M Sakurai
- Department of Physics, Kyushu University, Fukuoka 812-8581, Japan.
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48
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Egorov SA. Solvation dynamics in supercritical fluids: Equilibrium versus nonequilibrium solvent response functions. J Chem Phys 2004; 121:6948-55. [PMID: 15473754 DOI: 10.1063/1.1789932] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
We present a theoretical study of solvation dynamics in supercritical fluids. Molecular dynamics simulations show a significant difference between equilibrium and nonequilibrium solvent response functions, especially pronounced at medium and low solvent densities. We propose an analytical theory for the nonequilibrium solvation function based on the generalized nonlinear Smoluchowski-Vlasov equation. The theory is shown to be in good agreement with simulation, providing an accurate description of the nonequilibrium time-dependent solvent density profile around the solute over a wide range of supercritical solvent densities. The nonequilibrium solvent response function is shown to reflect gradual solvent clustering around the excited solute.
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Affiliation(s)
- S A Egorov
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22901, USA
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49
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Egorov SA. Ion solvation dynamics in supercritical fluids. PHYSICAL REVIEW LETTERS 2004; 93:023004. [PMID: 15323911 DOI: 10.1103/physrevlett.93.023004] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2004] [Indexed: 05/24/2023]
Abstract
We present a theoretical study of ion solvation dynamics in a supercritical solvent. Molecular dynamics simulations show a significant difference between equilibrium and nonequilibrium solvent response functions, especially pronounced at medium and low solvent densities. We propose a simple analytical theory for the nonequilibrium solvation function based on the generalized nonlinear Smoluchowski-Vlasov equation. The theory is shown to be in excellent agreement with simulation over a wide range of supercritical solvent densities.
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Affiliation(s)
- S A Egorov
- Department of Chemistry, University of Virginia, Charlottesville, Virginia 22901, USA
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50
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Mukherjee S, Sahu K, Roy D, Mondal SK, Bhattacharyya K. Solvation dynamics of 4-aminophthalimide in dioxane–water mixture. Chem Phys Lett 2004. [DOI: 10.1016/j.cplett.2003.11.098] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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