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Probing non-polarizable liquid/liquid interfaces using scanning ion conductance microscopy. Sci China Chem 2020. [DOI: 10.1007/s11426-019-9661-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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2
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Efficiency comparison of the imidazole plus RNO method for singlet oxygen detection in biorelevant solvents. Anal Bioanal Chem 2019; 411:5287-5296. [DOI: 10.1007/s00216-019-01910-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2019] [Revised: 05/03/2019] [Accepted: 05/09/2019] [Indexed: 10/26/2022]
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3
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Chang H, Gnanasekaran K, Gianneschi NC, Geiger FM. Bacterial Model Membranes Deform (resp. Persist) upon Ni2+ Binding to Inner Core (resp. O-Antigen) of Lipopolysaccharides. J Phys Chem B 2019; 123:4258-4270. [DOI: 10.1021/acs.jpcb.9b02762] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- HanByul Chang
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60660, United States
| | - Karthikeyan Gnanasekaran
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60660, United States
| | - Nathan C. Gianneschi
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60660, United States
| | - Franz M. Geiger
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60660, United States
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Abstract
The liquid interface is a narrow, highly anisotropic region, characterized by rapidly varying density, polarity, and molecular structure. I review several aspects of interfacial solvation and show how these affect reactivity at liquid/liquid interfaces. I specifically consider ion transfer, electron transfer, and SN2 reactions, showing that solvent effects on these reactions can be understood by examining the unique structure and dynamics of the liquid interface region.
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Affiliation(s)
- Ilan Benjamin
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064;
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6
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Gobrogge EA, Woods BL, Walker RA. Liquid organization and solvation properties at polar solid/liquid interfaces. Faraday Discuss 2013; 167:309-27. [DOI: 10.1039/c3fd00071k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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7
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Nelson KV, Benjamin I. Electronic Absorption Line Shapes at the Water Liquid/Vapor Interface. J Phys Chem B 2012; 116:4286-91. [DOI: 10.1021/jp3010037] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Katherine V. Nelson
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064,
United States
| | - Ilan Benjamin
- Department of Chemistry and Biochemistry, University of California, Santa Cruz, California 95064,
United States
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8
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Deshmukh SA, Sankaranarayanan SKRS. Atomic scale characterization of interfacial water near an oxide surface using molecular dynamics simulations. Phys Chem Chem Phys 2012; 14:15593-605. [DOI: 10.1039/c2cp42308a] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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10
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Ji T, Liang Z, Zhu X, Wang L, Liu S, Shao Y. Probing the structure of a water/nitrobenzene interface by scanning ion conductance microscopy. Chem Sci 2011. [DOI: 10.1039/c1sc00133g] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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11
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Wang JB, Ma JY, Li XY. Polarizable continuum model associated with the self-consistent-reaction field for molecular adsorbates at the interface. Phys Chem Chem Phys 2010; 12:207-14. [DOI: 10.1039/b914652k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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12
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Hydrogen-bonding molecular ruler surfactants as probes of specific solvation at liquid/liquid interfaces. Anal Bioanal Chem 2009; 395:1063-73. [DOI: 10.1007/s00216-009-2957-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2009] [Revised: 06/27/2009] [Accepted: 07/06/2009] [Indexed: 11/27/2022]
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13
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Perera JM, Stevens GW. Spectroscopic studies of molecular interaction at the liquid–liquid interface. Anal Bioanal Chem 2009; 395:1019-32. [DOI: 10.1007/s00216-009-2855-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2009] [Revised: 05/11/2009] [Accepted: 05/12/2009] [Indexed: 10/20/2022]
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14
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15
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Steel WH, Foresman JB, Burden DK, Lau YY, Walker RA. Solvation of Nitrophenol Isomers: Consequences for Solute Electronic Structure and Alkane/Water Partitioning. J Phys Chem B 2008; 113:759-66. [DOI: 10.1021/jp805184w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- William H. Steel
- Department of Physical Sciences, York College of Pennsylvania, York, Pennsylvania 17405,
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, and Department of Chemistry and Biochemistry and Chemical Physics Program, University of Maryland, College Park, Maryland 20742
| | - James B. Foresman
- Department of Physical Sciences, York College of Pennsylvania, York, Pennsylvania 17405,
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, and Department of Chemistry and Biochemistry and Chemical Physics Program, University of Maryland, College Park, Maryland 20742
| | - Daniel K. Burden
- Department of Physical Sciences, York College of Pennsylvania, York, Pennsylvania 17405,
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, and Department of Chemistry and Biochemistry and Chemical Physics Program, University of Maryland, College Park, Maryland 20742
| | - Yuen Y. Lau
- Department of Physical Sciences, York College of Pennsylvania, York, Pennsylvania 17405,
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, and Department of Chemistry and Biochemistry and Chemical Physics Program, University of Maryland, College Park, Maryland 20742
| | - Robert A. Walker
- Department of Physical Sciences, York College of Pennsylvania, York, Pennsylvania 17405,
- Department of Chemistry, University of Wisconsin, Madison, Wisconsin 53706, Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095, and Department of Chemistry and Biochemistry and Chemical Physics Program, University of Maryland, College Park, Maryland 20742
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16
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Huang X, Wang Y, Dong C, Shen HH, Thomas R. Structure of adsorbed layers of nitrophenoxy-tailed quaternary ammonium surfactants at the air/water interface studied by neutron reflection. J Colloid Interface Sci 2008; 325:114-21. [DOI: 10.1016/j.jcis.2008.05.043] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2008] [Revised: 05/20/2008] [Accepted: 05/22/2008] [Indexed: 10/22/2022]
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17
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Fermín DJ. Linear and Non‐Linear Spectroscopy at the Electrified Liquid/Liquid Interface. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/9783527616817.ch4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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18
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Ma JY, Wang JB, Li XY, Huang Y, Zhu Q, Fu KX. A study on orientation and absorption spectrum of interfacial molecules by using continuum model. J Comput Chem 2008; 29:198-210. [PMID: 17557282 DOI: 10.1002/jcc.20773] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
In this work, a numerical procedure based on the continuum model is developed and applied to the solvation energy for ground state and the spectral shift against the position and the orientation of the interfacial molecule. The interface is described as a sharp boundary separating two bulk media. The polarizable continuum model (PCM) allows us to account for both electrostatic and nonelectrostatic solute-solvent interactions when we calculate the solvation energy. In this work we extend PCM to the interfacial system and the information about the position and orientation of the interfacial molecule can be obtained. Based on the developed expression of the electrostatic free energy of a nonequilibrium state, the numerical procedure has been implemented and used to deal with a series of test molecules. The time-dependent density functional theory (TDDFT) associated with PCM is used for the electron structure and the spectroscopy calculations of the test molecules in homogeneous solvents. With the charge distribution of the ground and excited states, the position- and orientation-dependencies of the solvation energy and the spectrum have been investigated for the interfacial systems, taking the electrostatic interaction, the cavitation energy, and the dispersion-repulsion interaction into account. The cavitation energy is paid particular attention, since the interface portion cut off by the occupation of the interfacial molecule contributes an extra part to the stabilization for the interfacial system. The embedding depth, the favorable orientational angle, and the spectral shift for the interfacial molecule have been investigated in detail. From the solvation energy calculations, an explanation has been given on why the interfacial molecule, even if symmetrical in structure, tends to take a tilting manner, rather than perpendicular to the interface.
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Affiliation(s)
- Jian-Yi Ma
- College of Chemical Engineering, Sichuan University, Chengdu 610065, People's Republic of China
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19
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Day JPR, Bain CD. Ellipsometric study of depletion at oil-water interfaces. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2007; 76:041601. [PMID: 17994998 DOI: 10.1103/physreve.76.041601] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/07/2007] [Indexed: 05/25/2023]
Abstract
Ellipsometry is exquisitely sensitive to density variations across a fluid-fluid interface. The coefficient of ellipticity at the interface between water and a series of nonpolar and polar oils is the opposite sign to that predicted for an interface roughened by thermal capillary waves. For pure hydrocarbons, the coefficient of ellipticity is correlated with the refractive index of the oil, but is largely independent of the molecular architecture of the oil phase, ruling out molecular alignment at the interface as the major cause of the deviation from the capillary-wave model. The introduction of a "drying" layer between the oil and water can explain the experimental data. The thickness of the drying layer, modeled as a slab with a relative permittivity of unity, was only 0.3-0.4 A, which is close to that expected simply from the hard sphere repulsion of a hydrocarbon surface. For polar oils, the coefficient of ellipticity decreases as the interfacial tension decreases, consistent with the reduction in thickness of the hard-sphere exclusion region on account of the formation of hydrogen bonds to water.
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Affiliation(s)
- James P R Day
- Department of Chemistry, Durham University, South Road, Durham DH1 3LE, United Kingdom
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20
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Walker DS, Richmond GL. Depth Profiling of Water Molecules at the Liquid−Liquid Interface Using a Combined Surface Vibrational Spectroscopy and Molecular Dynamics Approach. J Am Chem Soc 2007; 129:9446-51. [PMID: 17616192 DOI: 10.1021/ja071740b] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The studies presented here combine experimental and computational approaches to provide new insights into how water structures and penetrates into the organic phase at two different liquid-liquid systems: the interfaces of carbon tetrachloride-water (CCl4-H2O) and 1,2-dichloroethane-water (DCE-H2O). In particular, molecular dynamics simulations are performed to generate computational spectral intensities of the CCl4-H2O and DCE-H2O interfaces that are directly comparable with experimental measurements. These simulations are then applied toward the generation of spectral profiles, responses that vary as functions of both frequency and interfacial depth. These studies emphasize the similarities and differences in the structure, orientation, and bonding of interfacial water as a function of interfacial depth for these two liquid-liquid systems and demonstrate the differing behavior of water monomers that penetrate into the organic phase.
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Affiliation(s)
- Dave S Walker
- Department of Chemistry and Materials Science Institute, University of Oregon, Eugene, OR 97403, USA
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21
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Yamaguchi S, Tahara T. Determining electronic spectra at interfaces by electronic sum frequency generation: One- and two-photon double resonant oxazine 750 at the air/water interface. J Chem Phys 2006; 125:194711. [PMID: 17129154 DOI: 10.1063/1.2375093] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The second-order nonlinear electronic spectra were measured for a dye oxazine 750 (OX750) adsorbed at the air/water interface using the multiplex electronic sum frequency generation (ESFG) spectroscopy recently developed by our group. The excitation-wavelength dependence of the ESFG spectrum was investigated, and a global fitting analysis was performed to separate contributions of one- and two-photon resonances. The analysis yielded linear interface electronic spectra in the one- and two-photon resonance regions, which can be directly compared to bulk absorption spectra. A two-dimensional plot of the linear interface electronic spectra is newly proposed to graphically represent all the essential information on the electronic structure of interfacial molecules. On this new analytical basis of the ESFG spectroscopy, the spectroscopic properties of OX750 at the interface are discussed.
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Affiliation(s)
- Shoichi Yamaguchi
- Molecular Spectroscopy Laboratory, RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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22
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Xiao H, Liang D, Liu G, Guo M, Xing W, Cheng J. Initial study of two-phase laminar flow extraction chip for sample preparation for gas chromatography. LAB ON A CHIP 2006; 6:1067-72. [PMID: 16874380 DOI: 10.1039/b600374e] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
A sample preparation method for gas chromatography using a two-phase, laminar flow extraction PDMS/glass chip has been developed. A stable two-phase laminar interface was obtained by surface modification, and the organic extraction phase and the aqueous sample phase were separated effectively when the two-phase laminar flows exit the chip. Experiments were conducted on the chip to extract ephedrine from aqueous solution. Good reproducibility was obtained over the entire range of ephedrine concentration using the extraction chips (CV range 2.7%-4.5%). Effects of salt and solvent on extraction efficiency were studied.
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Affiliation(s)
- Hong Xiao
- Department of Biological Sciences and Biotechnology, Tsinghua University, Beijing 100084, China
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23
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Affiliation(s)
- Ilan Benjamin
- Department of Chemistry, University of California, Santa Cruz, California 95064, USA
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24
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Beildeck CL, Liu MJ, Brindza MR, Walker RA. Solvation of p-Nitrophenol at a Water/Alkane Interface: The Role of Ionic Strength and Salt Identity. J Phys Chem B 2005; 109:14604-10. [PMID: 16852842 DOI: 10.1021/jp0518097] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Second harmonic generation (SHG), a surface specific, nonlinear optical spectroscopy, was used to study the interfacial solvation of a neutral surfactant, p-nitrophenol (PNP), adsorbed to the water/cyclohexane interface in the presence of simple salts at varying salt concentrations. The purpose of this work was to determine what relationship (if any) exists between interfacial polarity and bulk solution ionic strength. Data show an apparent red shift in SHG spectra with an increase in salt anion size from fluoride to chloride to bromide at 1 M salt concentrations. A spectral red shift of the PNP electronic excitation implies an increase in local polarity. Within experimental limits, however, these observed interfacial spectral shifts mimic shifts in absorbance spectra observed for PNP in bulk electrolyte solutions. Given the similarities between bulk and surface behavior, we conclude that observed shifts in SHG spectra may be attributed to effects similar to those found in bulk solution. Additionally, the surface adsorption of PNP to the water/cyclohexane interface was studied to determine the surface distribution of PNP and the conjugate base, p-nitrophenoxide (PNP(-)), for a 10 mM PNP solution. PNP adsorption is favored over PNP(-) adsorption by a factor of 10, giving rise to an equilibrium surface distribution that is an order of magnitude greater than that found in bulk solution. These findings indicate that the amount of PNP(-) at the surface in an aqueous solution of 10 mM PNP is negligible.
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Affiliation(s)
- Carmen L Beildeck
- University of Maryland, Department of Chemistry and Biochemistry, College Park, Maryland 20741, USA
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Yamaguchi S, Tahara T. Precise Electronic χ(2) Spectra of Molecules Adsorbed at an Interface Measured by Multiplex Sum Frequency Generation. J Phys Chem B 2004. [DOI: 10.1021/jp045306x] [Citation(s) in RCA: 58] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Shoichi Yamaguchi
- Molecular Spectroscopy Laboratory, RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Tahei Tahara
- Molecular Spectroscopy Laboratory, RIKEN (The Institute of Physical and Chemical Research), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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