51
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Lyashchenko AK, Balakaeva IV, Loginova DV, Timofeeva LM. Microwave dielectric properties of aqueous trifluoroacetic acid solutions. RUSS J INORG CHEM+ 2014. [DOI: 10.1134/s003602361412016x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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52
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Fan X, Zhao K. Thermodynamics of Micellization of Ionic Liquids C6mimBr and Orientation Dynamics of Water for C6mimBr–Water Mixtures: A Dielectric Spectroscopy Study. J Phys Chem B 2014; 118:13729-36. [DOI: 10.1021/jp506589f] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Xiaoqing Fan
- College
of Chemistry, Beijing Normal University, Beijing 100875, China
| | - Kongshuang Zhao
- College
of Chemistry, Beijing Normal University, Beijing 100875, China
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53
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Fedotova MV, Kruchinin SE. Ion-binding of glycine zwitterion with inorganic ions in biologically relevant aqueous electrolyte solutions. Biophys Chem 2014; 190-191:25-31. [DOI: 10.1016/j.bpc.2014.04.001] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Revised: 04/02/2014] [Accepted: 04/02/2014] [Indexed: 11/29/2022]
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54
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Pastorczak M, van der Post ST, Bakker HJ. Cooperative hydration of carboxylate groups with alkali cations. Phys Chem Chem Phys 2014; 15:17767-70. [PMID: 24068108 DOI: 10.1039/c3cp52419a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We study the orientational dynamics of water molecules in solutions of formate salts using femtosecond mid-infrared spectroscopy. We observe that combining the formate ion with small cations like Na(+) or Li(+) leads to a cooperative effect on the water dynamics. This observation points at the formation of solvent-separated ion pairs.
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Affiliation(s)
- Marcin Pastorczak
- FOM Institute AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands.
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55
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Mazur K, Buchner R, Bonn M, Hunger J. Hydration of Sodium Alginate in Aqueous Solution. Macromolecules 2014. [DOI: 10.1021/ma4023873] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Kamila Mazur
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Richard Buchner
- Institut
für Physikalische und Theoretische Chemie, Universität Regensburg, 93040 Regensburg, Germany
| | - Mischa Bonn
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Johannes Hunger
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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56
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Rudolph WW, Fischer D, Irmer G. Vibrational spectroscopic studies and DFT calculations on NaCH3CO2(aq) and CH3COOH(aq). Dalton Trans 2014; 43:3174-85. [DOI: 10.1039/c3dt52580e] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
NaCH3CO2(aq) and CH3COOH(aq) were studied using Raman and infrared spectroscopy over a large concentration range, in the terahertz region and up to 4000 cm−1. Band assignments for CH3CO2−(aq) and CH3COOH(aq) were carried out under guidance of DFT frequencies.
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Affiliation(s)
- Wolfram W. Rudolph
- Medizinische Fakultät der TU Dresden
- Institut für Virologie im MTZ
- 01307 Dresden, Germany
| | - Dieter Fischer
- Institute of Polymer Research Dresden
- 01069 Dresden, Germany
| | - Gert Irmer
- Technische Universität Bergakademie Freiberg
- Institut für Theoretische Physik
- 09596 Freiberg, Germany
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57
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Lima FS, Chaimovich H, Cuccovia IM, Buchner R. Dielectric relaxation spectroscopy shows a sparingly hydrated interface and low counterion mobility in triflate micelles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:10037-10046. [PMID: 23899188 DOI: 10.1021/la401728g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The properties of ionic micelles are affected by the nature of the counterion. Specific ion effects can be dramatic, inducing even shape and phase changes in micellar solutions, transitions apparently related to micellar hydration and counterion binding at the micellar interface. Thus, determining the hydration and dynamics of ions in micellar systems capable of undergoing such transitions is a crucial step in understanding shape and phase changes. For cationic micelles, such transitions are common with large organic anions as counterions. Interestingly, however, phase separation also occurs for dodecyltrimethylammonium triflate (DTATf) micelles in the presence of sodium triflate (NaTf). Specific ion effects for micellar solutions of dodecyltrimethylammonium chloride (DTAC), bromide (DTAB), methanesulfonate (DTAMs), and triflate (DTATf) were studied with dielectric relaxation spectroscopy (DRS), a technique capable of monitoring hydration and counterion dynamics of micellar aggregates. In comparison to DTAB, DTAC, and DTAMs, DTATf micelles were found to be considerably less hydrated and showed reduced counterion mobility at the micellar interface. The obtained DTATf and DTAMs data support the reported central role of the anion's -CF3 moiety with respect to the properties of DTATf micelles. The reduced hydration observed for DTATf micelles was rationalized in terms of the higher packing of this surfactant compared to that of other DTA-based systems. The decreased mobility of Tf(-) anions condensed at the DTATf interface strongly suggests the insertion of Tf(-) in the micellar interface, which is apparently driven by the strong hydrophobicity of -CF3.
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Affiliation(s)
- Filipe S Lima
- Instituto de Química, Universidade de São Paulo, São Paulo, Brazil
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58
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Rahman HMA, Hefter G, Buchner R. Hydrophilic and Hydrophobic Hydration of Sodium Propanoate and Sodium Butanoate in Aqueous Solution. J Phys Chem B 2013; 117:2142-52. [DOI: 10.1021/jp310029c] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Hafiz M. A. Rahman
- Institut für Physikalische
und Theoretische Chemie, Universität Regensburg, D-93040 Regensburg, Germany
| | - Glenn Hefter
- Chemistry Department, Murdoch University, Murdoch, WA 6150 Australia
| | - Richard Buchner
- Institut für Physikalische
und Theoretische Chemie, Universität Regensburg, D-93040 Regensburg, Germany
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59
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Ion-pair or ion-cloud relaxation? On the origin of small-amplitude low-frequency relaxations of weakly associating aqueous electrolytes. J Mol Liq 2012. [DOI: 10.1016/j.molliq.2012.03.025] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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60
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61
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Matyushov DV. On the theory of dielectric spectroscopy of protein solutions. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:325105-8. [PMID: 22750762 DOI: 10.1088/0953-8984/24/32/325105] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We present a theory of the dielectric response of solutions containing large solutes, of the nanometer size, in a molecular solvent. It combines the molecular dipole moment of the solute with the polarization of a large subensemble of solvent molecules at the solute-solvent interface. The goal of the theory is two-fold: (i) to formulate the problem of the dielectric response avoiding the reliance on the cavity-field susceptibility of dielectric theories and (ii) to separate the non-additive polarization of the interface, jointly produced by the external field of the laboratory experiment and the solute, from specific solute-solvent interactions contributing to the dielectric signal. The theory is applied to experimentally reported frequency-dependent dielectric spectra of lysozyme in solution. The analysis of the data in the broad range of frequencies up to 700 GHz shows that the cavity-field susceptibility, critical for the theory formulation, is consistent with the prediction of Maxwell's electrostatics in the frequency range of 10-200 GHz, but deviates from it outside this range. In particular, it becomes much smaller than the Maxwell result, and shifts to negative values, at small frequencies. The latter observation implies a dia-electric response, or negative dielectrophoresis, of hydrated lysozyme. It also implies that the effective protein dipole recorded by dielectric spectroscopy is much smaller than the value calculated from the protein's charge distribution. We suggest an empirical equation that describes both the increment of the static dielectric constant and the decrement of the Debye water peak with increasing protein concentration. It gives fair agreement with broad-band dispersion and loss spectra of protein solutions, but misses the δ-dispersion region.
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Affiliation(s)
- Dmitry V Matyushov
- Center for Biological Physics, Arizona State University, PO Box 871504, Tempe, AZ 85287-1504, USA.
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62
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Nosal-Wiercińska A. Electrochemical and thermodynamic study of the electroreduction of Bi(III) ions in the presence of cysteine in solutions of different water activity. J Electroanal Chem (Lausanne) 2012. [DOI: 10.1016/j.jelechem.2012.06.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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63
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Papaiconomou N, Simonin JP, Bernard O. Solutions of Alkylammonium and Bulky Anions: Description of Osmotic Coefficients within the Binding Mean Spherical Approximation. Ind Eng Chem Res 2012. [DOI: 10.1021/ie202954y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nicolas Papaiconomou
- LCME, Université de Savoie, Bâtiment Chartreuse, Savoie Technolac,
73376 Le Bourget du Lac CEDEX, France
| | | | - Olivier Bernard
- Laboratoire PECSA (UMR CNRS
7195), Université Pierre et Marie Curie,
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64
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Collins KD. Why continuum electrostatics theories cannot explain biological structure, polyelectrolytes or ionic strength effects in ion–protein interactions. Biophys Chem 2012; 167:43-59. [DOI: 10.1016/j.bpc.2012.04.002] [Citation(s) in RCA: 169] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Revised: 04/10/2012] [Accepted: 04/10/2012] [Indexed: 01/13/2023]
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65
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Kondo T, Miyazaki Y, Inaba A, Koga Y. Effects of Carboxylate Anions on the Molecular Organization of H2O as Probed by 1-Propanol. J Phys Chem B 2012; 116:3571-7. [DOI: 10.1021/jp2118407] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Takemi Kondo
- Research Center for Structural Thermodynamics, Graduate
School of Sciences, Osaka University, Toyonaka,
Osaka 560-0043 Japan
| | - Yuji Miyazaki
- Research Center for Structural Thermodynamics, Graduate
School of Sciences, Osaka University, Toyonaka,
Osaka 560-0043 Japan
| | - Akira Inaba
- Research Center for Structural Thermodynamics, Graduate
School of Sciences, Osaka University, Toyonaka,
Osaka 560-0043 Japan
| | - Yoshikata Koga
- Department of Chemistry, The University of British Columbia, Vancouver, BC Canada V6T 1Z1
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66
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Shi W, Damodaran K, Nulwala HB, Luebke DR. Theoretical and experimental studies of water interaction in acetate based ionic liquids. Phys Chem Chem Phys 2012; 14:15897-908. [DOI: 10.1039/c2cp42975f] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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