101
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Breen KJ, DeBlase AF, Guasco TL, Voora VK, Jordan KD, Nagata T, Johnson MA. Bottom-Up View of Water Network-Mediated CO2 Reduction Using Cryogenic Cluster Ion Spectroscopy and Direct Dynamics Simulations. J Phys Chem A 2011; 116:903-12. [DOI: 10.1021/jp209493v] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kristin J. Breen
- Sterling Chemistry Laboratory, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Andrew F. DeBlase
- Sterling Chemistry Laboratory, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Timothy L. Guasco
- Sterling Chemistry Laboratory, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Vamsee K. Voora
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, United States
| | - Kenneth D. Jordan
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260, United States
| | - Takashi Nagata
- Department of Basic Science, Graduate School of Arts and Sciences, The University of Tokyo, Komaba, Meguro, Tokyo, 153-8902 Japan
| | - Mark A. Johnson
- Sterling Chemistry Laboratory, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
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102
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Neogi SG, Chaudhury P. Structure and spectroscopy of water-fluoride microclusters: A combined genetic algorithm and DFT-based study. J Comput Chem 2011; 33:629-39. [DOI: 10.1002/jcc.21994] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2011] [Revised: 10/14/2011] [Accepted: 10/15/2011] [Indexed: 01/14/2023]
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103
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Toffoli D, Sparta M, Christiansen O. Vibrational spectroscopy of hydrogen-bonded systems: Six-dimensional simulation of the IR spectrum of F−(H2O) complex. Chem Phys Lett 2011. [DOI: 10.1016/j.cplett.2011.05.008] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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104
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Kamarchik E, Wang Y, Bowman JM. Quantum vibrational analysis and infrared spectra of microhydrated sodium ions using an ab initio potential. J Chem Phys 2011; 134:114311. [DOI: 10.1063/1.3567186] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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105
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Hurtado P, Gámez F, Hamad S, Martínez-Haya B, Steill JD, Oomens J. Crown Ether Complexes with H3O+ and NH4+: Proton Localization and Proton Bridge Formation. J Phys Chem A 2011; 115:7275-82. [DOI: 10.1021/jp200481w] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Paola Hurtado
- Departamento de Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, 41013 Seville, Spain
| | - F. Gámez
- Departamento de Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, 41013 Seville, Spain
| | - Said Hamad
- Departamento de Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, 41013 Seville, Spain
| | - Bruno Martínez-Haya
- Departamento de Sistemas Físicos, Químicos y Naturales, Universidad Pablo de Olavide, 41013 Seville, Spain
| | - Jeffrey D. Steill
- FOM Institute for Plasma Physics Rijnhuizen, Edisonbaan 14, NL-3439 MN Nieuwegein, The Netherlands
| | - Jos Oomens
- FOM Institute for Plasma Physics Rijnhuizen, Edisonbaan 14, NL-3439 MN Nieuwegein, The Netherlands
- University of Amsterdam, Science Park 904, 1098XH Amsterdam, The Netherlands
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106
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Ramos-Cordoba E, Lambrecht DS, Head-Gordon M. Charge-transfer and the hydrogen bond: Spectroscopic and structural implications from electronic structure calculations. Faraday Discuss 2011; 150:345-62; discussion 391-418. [DOI: 10.1039/c1fd00004g] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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107
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Callahan KM, Casillas-Ituarte NN, Xu M, Roeselová M, Allen HC, Tobias DJ. Effect of magnesium cation on the interfacial properties of aqueous salt solutions. J Phys Chem A 2010; 114:8359-68. [PMID: 20701343 DOI: 10.1021/jp103485t] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Sodium chloride solutions have been used extensively as a model of seawater in both theoretical and experimental studies of the chemistry of sea salt aerosol. Many groups have found that chloride anions are present at the air-solution interface. This observation has been important for the development of a mechanism for the heterogeneous production of molecular chlorine from chloride in sea salt aerosol. However, while sodium chloride is a major constituent of seawater, it is by no means the only salt present. Seawater contains one Mg(2+) for every eight Na(+). Mg(2+) is naturally occurring in ocean waters from mineral deposits in the Earth's crust and biological sources. Mg(2+) forms a hexahydrate structure, rather than contact ion pairs with chloride anion, and this impacts the ordering of water in solution. In this study, we use molecular dynamics simulations, ab initio calculations, and vibrational sum frequency generation (SFG) spectroscopy to explore the effect of the Mg(2+) cation and its tightly bound solvation shell on the surface propensity of chloride, ion-ion interactions, and water structure of the air-solution interface of concentrated chloride salt solutions. In addition, we provide molecular level details that may be relevant to the heterogeneous reactions of chloride in deliquesced sea salt aerosols. In particular, we show that the presence of the divalent Mg(2+) cation does not modify the surface propensity of chloride compared to Na(+) and hence, its availability to interfacial reaction, although some differences in the behavior of chloride may occur due to specific ion interactions. In this work, we also discuss the SFG free OH band at the surface of salt solutions and conclude that it is often not straightforward to interpret.
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Affiliation(s)
- Karen M Callahan
- AirUCI Environmental Molecular Science Institute and Department of Chemistry, University of California, Irvine, California 92697, USA
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108
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Pratihar S, Chandra A. Excess electron and lithium atom solvation in water clusters at finite temperature: an ab initio molecular dynamics study of the structural, spectral, and dynamical behavior of (H2O)6- and Li(H2O)6. J Phys Chem A 2010; 114:11869-78. [PMID: 20958010 DOI: 10.1021/jp103139c] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The roles of hydrogen bonds in the solvation of an excess electron and a lithium atom in water hexamer cluster at 150 K have been studied by means of ab initio molecular dynamics simulations. It is found that the hydrogen bonded structures of (H(2)O)(6)(-) and Li(H(2)O)(6) clusters are very different from each other and they dynamically evolve from one conformer to other along their simulation trajectories. The populations of the single acceptor, double acceptor, and free type water molecules are found to be significantly high unlike that in pure water clusters. Free hydrogens of these type of water molecules primarily capture the unbound electron density in these clusters. It is found that the binding motifs of the free electron evolve with time and the vertical detachment energy of (H(2)O)(6)(-) and vertical ionization energy of Li(H(2)O)(6) also change with time. Assignments of the observed peaks in vibrational power spectra are done, and we found direct correlations between the time-averaged population of water molecules in different hydrogen bonding states and the spectral features. The dynamical aspects of these clusters have also been studied through calculations of time correlations of instantaneous stretch frequencies of OH modes which are obtained from the simulation trajectories through a time series analysis.
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Affiliation(s)
- Subha Pratihar
- Department of Chemistry, Indian Institute of Technology, Kanpur, India 208016
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109
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Xantheas SS. Anharmonic vibrational spectra of hydrogen bonded clusters: comparison between higher energy derivative and mean-field grid based methods. INT REV PHYS CHEM 2010. [DOI: 10.1080/01442350600922564] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Sotiris S. Xantheas
- a Chemical Sciences Division , Pacific Northwest National Laboratory , 902 Battelle Boulevard, PO Box 999, MS K1-83, Richland , WA, 99352 , USA
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110
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Entfellner M, Opalka D, Boesl U. Photodetachment-photoelectron spectroscopy of HS- x H2S and DS- x D2S: the transition states of the SH + H2S and SD + D2S reactions. Phys Chem Chem Phys 2010; 12:9034-42. [PMID: 20556264 DOI: 10.1039/b925941d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The transition state region for neutral hydrogen transfer reactions can be accessed by photodetachment of a stable negative ion with a geometry similar to that of the neutral transition state. In this work the SH + H(2)S and SD + D(2)S reactions are investigated by photodetachment-photoelectron spectroscopy of HS(-) x H(2)S and DS(-) x D(2)S. The spectra exhibit vibrational structure which is attributed to the antisymmetric stretching mode (H-atom motion) of the neutral transitions state for H-atom transfer. The spectra are compared to one-dimensional simulations performed using a wave packet propagation scheme. Electronic structure calculations of the anionic, neutral and transition-state geometries and calculations of the vertical detachment energy at different levels of theory are used to support the analysis of the spectra. A vertical detachment energy VDE of 3.06 eV has been determined.
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111
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Marcum JC, Weber JM. Microhydration of Nitromethane Anions from Both a Solute and Solvent Perspective. J Phys Chem A 2010; 114:8933-8. [DOI: 10.1021/jp103682q] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jesse C. Marcum
- JILA, NIST, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309
| | - J. Mathias Weber
- JILA, NIST, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309
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112
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113
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Hojo M, Ueda T, Ueno E, Hamasaki T, Nakano T. Salt Effects on the Rates and Mechanisms of Solvolysis Reaction of Organic Halides and Water Structure Distortion inN,N-Dimethylformamide– andN,N-Dimethylacetamide–Water Mixed Solvents. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2010. [DOI: 10.1246/bcsj.20090329] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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114
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Suzuki K, Tachikawa M, Shiga M. Efficient ab initio path integral hybrid Monte Carlo based on the fourth-order Trotter expansion: Application to fluoride ion-water cluster. J Chem Phys 2010; 132:144108. [DOI: 10.1063/1.3367724] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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115
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Bisson P, Xiao H, Kuo M, Kamelamela N, Shultz MJ. Ions and Hydrogen Bonding in a Hydrophobic Environment: CCl4. J Phys Chem A 2010; 114:4051-7. [DOI: 10.1021/jp9106712] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Patrick Bisson
- Pearson Lab, Tufts University, Medford, Massachusetts 02155
| | - Han Xiao
- Pearson Lab, Tufts University, Medford, Massachusetts 02155
| | - Margaret Kuo
- Pearson Lab, Tufts University, Medford, Massachusetts 02155
| | - Noe Kamelamela
- Pearson Lab, Tufts University, Medford, Massachusetts 02155
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116
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Takahashi K. Theoretical study on the effect of intramolecular hydrogen bonding on OH stretching overtone decay lifetime of ethylene glycol, 1,3-propanediol, and 1,4-butanediol. Phys Chem Chem Phys 2010; 12:13950-61. [DOI: 10.1039/c0cp00788a] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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117
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Horvath S, McCoy AB, Elliott BM, Weddle GH, Roscioli JR, Johnson MA. Anharmonicities and Isotopic Effects in the Vibrational Spectra of X−·H2O, ·HDO, and ·D2O [X = Cl, Br, and I] Binary Complexes. J Phys Chem A 2009; 114:1556-68. [DOI: 10.1021/jp9088782] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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118
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Fleisher AJ, Morgan PJ, Pratt DW. Charge transfer by electronic excitation: Direct measurement by high resolution spectroscopy in the gas phase. J Chem Phys 2009; 131:211101. [DOI: 10.1063/1.3259690] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
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119
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McCoy AB, Sprague MK, Okumura M. The Role of Torsion/Torsion Coupling in the Vibrational Spectrum of Cis−Cis HOONO. J Phys Chem A 2009; 114:1324-33. [DOI: 10.1021/jp905731h] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Anne B. McCoy
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Matthew K. Sprague
- Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125
| | - Mitchio Okumura
- Arthur Amos Noyes Laboratory of Chemical Physics, California Institute of Technology, Pasadena, California 91125
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120
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Soloveichik P, O’Donnell BA, Lester MI, Francisco JS, McCoy AB. Infrared Spectrum and Stability of the H2O−HO Complex: Experiment and Theory. J Phys Chem A 2009; 114:1529-38. [DOI: 10.1021/jp907885d] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Pesia Soloveichik
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323
| | - Bridget A. O’Donnell
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323
| | - Marsha I. Lester
- Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323
| | - Joseph S. Francisco
- Department of Chemistry, Purdue University, West Lafayette, Indiana 47907-2084
| | - Anne B. McCoy
- Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210
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121
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Maeyama T, Yoshida K, Yagi I, Fujii A, Mikami N. Interpreting the physical background of empirical solvent polarity via photodetachment spectroscopy of microsolvated aromatic ketyl anions. J Phys Chem A 2009; 113:10593-602. [PMID: 19743806 DOI: 10.1021/jp901641n] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The physical background of empirical solvent polarity is explored in regard to trends in solute-solvent intermolecular potential energy functions. Aromatic ketyl anions, benzophenone, and 9-fluorenone radical anions, are chosen for a model solute molecule showing solvatochromic behavior similar to betaine-30 dye, which provides the most established solvent polarity scale, E(T)(30). Common features among the ketyl anions and betaine-30 were examined with quantum chemical calculations for the electronic states and solvation structure. Vertical photodetachment and photoabsorption energies were determined for the ketyl anions microsolvated with a single solvent molecule by measuring photoelectron spectra as well as photodetachment excitation spectra for several aprotic and protic solvents. The spectroscopic data were analyzed through quantum chemical calculations based on density functional theory, and their relationship with the characteristics of intermolecular potential energies was considered. As a result, the typical solvent polarity parameter can be interpreted to reflect essentially the gradient of a potential energy function (namely, the strength of force) between a negative charge and the solvent molecules in the attractive region. A large polarity for protic solvents is attributed to an effective interaction of a proton-like hydrogen atom with the negative charge in a short-range.
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Affiliation(s)
- Toshihiko Maeyama
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan.
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122
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Mollner AK, Casterline BE, Ch’ng LC, Reisler H. Imaging the State-Specific Vibrational Predissociation of the Ammonia−Water Hydrogen-Bonded Dimer. J Phys Chem A 2009; 113:10174-83. [DOI: 10.1021/jp904566w] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andrew K. Mollner
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-0482
| | - Blithe E. Casterline
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-0482
| | - Lee C. Ch’ng
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-0482
| | - Hanna Reisler
- Department of Chemistry, University of Southern California, Los Angeles, California 90089-0482
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123
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Wang XB, Werhahn JC, Wang LS, Kowalski K, Laubereau A, Xantheas SS. Observation of a Remarkable Temperature Effect in the Hydrogen Bonding Structure and Dynamics of the CN−(H2O) Cluster. J Phys Chem A 2009; 113:9579-84. [DOI: 10.1021/jp9034002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xue-Bin Wang
- Department of Physics, Washington State University, 2710 University Drive, Richland, Washington 99354, Chemical & Materials Sciences Division, Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, MS K8-88, Richland, Washington 99352, Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, P.O. Box 999, MS K8-91, Richland, Washington 99352, Physik-Department E11, Technische Universität München, James-Franck-Strasse, D-85748 Garching, Germany, and
| | - Jasper C. Werhahn
- Department of Physics, Washington State University, 2710 University Drive, Richland, Washington 99354, Chemical & Materials Sciences Division, Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, MS K8-88, Richland, Washington 99352, Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, P.O. Box 999, MS K8-91, Richland, Washington 99352, Physik-Department E11, Technische Universität München, James-Franck-Strasse, D-85748 Garching, Germany, and
| | - Lai-Sheng Wang
- Department of Physics, Washington State University, 2710 University Drive, Richland, Washington 99354, Chemical & Materials Sciences Division, Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, MS K8-88, Richland, Washington 99352, Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, P.O. Box 999, MS K8-91, Richland, Washington 99352, Physik-Department E11, Technische Universität München, James-Franck-Strasse, D-85748 Garching, Germany, and
| | - Karol Kowalski
- Department of Physics, Washington State University, 2710 University Drive, Richland, Washington 99354, Chemical & Materials Sciences Division, Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, MS K8-88, Richland, Washington 99352, Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, P.O. Box 999, MS K8-91, Richland, Washington 99352, Physik-Department E11, Technische Universität München, James-Franck-Strasse, D-85748 Garching, Germany, and
| | - Alfred Laubereau
- Department of Physics, Washington State University, 2710 University Drive, Richland, Washington 99354, Chemical & Materials Sciences Division, Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, MS K8-88, Richland, Washington 99352, Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, P.O. Box 999, MS K8-91, Richland, Washington 99352, Physik-Department E11, Technische Universität München, James-Franck-Strasse, D-85748 Garching, Germany, and
| | - Sotiris S. Xantheas
- Department of Physics, Washington State University, 2710 University Drive, Richland, Washington 99354, Chemical & Materials Sciences Division, Pacific Northwest National Laboratory, 902 Battelle Boulevard, P.O. Box 999, MS K8-88, Richland, Washington 99352, Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, P.O. Box 999, MS K8-91, Richland, Washington 99352, Physik-Department E11, Technische Universität München, James-Franck-Strasse, D-85748 Garching, Germany, and
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124
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McCoy AB, Diken EG, Johnson MA. Generating Spectra from Ground-State Wave Functions: Unraveling Anharmonic Effects in the OH−·H2O Vibrational Predissociation Spectrum. J Phys Chem A 2009; 113:7346-52. [DOI: 10.1021/jp811352c] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Anne B. McCoy
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Eric G. Diken
- Department of Chemistry, Yale University, New Haven, Connecticut 06520
| | - Mark A. Johnson
- Department of Chemistry, Yale University, New Haven, Connecticut 06520
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125
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Gardenier GH, Johnson MA, McCoy AB. Spectroscopic Study of the Ion−Radical H-Bond in H4O2+. J Phys Chem A 2009; 113:4772-9. [DOI: 10.1021/jp811493s] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Mark. A. Johnson
- Department of Chemistry, Yale University, New Haven, Connecticut 06520
| | - Anne B. McCoy
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
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126
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Mielke SL, Truhlar DG. Improved Methods for Feynman Path Integral Calculations of Vibrational−Rotational Free Energies and Application to Isotopic Fractionation of Hydrated Chloride Ions. J Phys Chem A 2009; 113:4817-27. [DOI: 10.1021/jp900834u] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Steven L. Mielke
- Department of Chemistry and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431
| | - Donald G. Truhlar
- Department of Chemistry and Supercomputing Institute, University of Minnesota, Minneapolis, Minnesota 55455-0431
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127
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Oomens J, Steill JD, Redlich B. Gas-Phase IR Spectroscopy of Deprotonated Amino Acids. J Am Chem Soc 2009; 131:4310-9. [DOI: 10.1021/ja807615v] [Citation(s) in RCA: 155] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jos Oomens
- FOM Institute for Plasma Physics “Rijnhuizen”, Edisonbaan 14, 3439MN Nieuwegein, The Netherlands
| | - Jeffrey D. Steill
- FOM Institute for Plasma Physics “Rijnhuizen”, Edisonbaan 14, 3439MN Nieuwegein, The Netherlands
| | - Britta Redlich
- FOM Institute for Plasma Physics “Rijnhuizen”, Edisonbaan 14, 3439MN Nieuwegein, The Netherlands
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128
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Prell JS, Williams ER. Structures of Thermal, Mass-Selected Water Clusters Probed with Hydrophobic Ion Tags and Infrared Photodissociation Spectroscopy. J Am Chem Soc 2009; 131:4110-9. [DOI: 10.1021/ja809414a] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- James S. Prell
- Department of Chemistry, University of California, Berkeley, California 94720-1460
| | - Evan R. Williams
- Department of Chemistry, University of California, Berkeley, California 94720-1460
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129
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Anomalously strong effect of the ion sign on the thermochemistry of hydrogen bonded aqueous clusters of identical chemical composition. Int J Mol Sci 2009; 10:507-517. [PMID: 19333418 PMCID: PMC2660665 DOI: 10.3390/ijms10020507] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2008] [Revised: 01/05/2009] [Accepted: 01/07/2009] [Indexed: 12/26/2022] Open
Abstract
The sign preference of hydrogen bonded aqueous ionic clusters X±(H2O)i (n =1–5, X = F; Cl; Br) has been investigated using the Density Functional Theory and ab initio MP2 method. The present study indicates the anomalously large difference in formation free energies between cations and anions of identical chemical composition. The effect of vibrational anharmonicity on stepwise Gibbs free energy changes has been investigated, and possible uncertainties associated with the harmonic treatment of vibrational spectra have been discussed.
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130
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Elliott BM, Relph RA, Roscioli JR, Bopp JC, Gardenier GH, Guasco TL, Johnson MA. Isolating the spectra of cluster ion isomers using Ar-"tag" -mediated IR-IR double resonance within the vibrational manifolds: Application to NO2- *H2O. J Chem Phys 2009; 129:094303. [PMID: 19044866 DOI: 10.1063/1.2966002] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
We demonstrate a method for isolating the vibrational predissociation spectra of different structural isomers of mass-selected cluster ions based on a population-labeling double resonance scheme. This involves a variation on the "ion dip" approach and is carried out with three stages of mass selection in order to separate the fragment ion signals arising from a fixed-frequency population-monitoring laser and those generated by a scanned laser that removes population of species resonant in the course of the scan. We demonstrate the method on the Ar-tagged NO(2) (-)H(2)O cluster, where we identify the spectral patterns arising from two isomers. One of these structures features accommodation of the water molecule in a double H-bond arrangement, while in the other, H(2)O attaches in a single ionic H-bond motif where the nominally free OH group is oriented toward the N atom of NO(2) (-). Transitions derived from both the NO(2) (-) and H(2)O constituents are observed for both isomers, allowing us to gauge the distortions suffered by both the ion and solvent molecules in the different hydration arrangements.
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Affiliation(s)
- Ben M Elliott
- Sterling Chemistry Laboratory, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, USA
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131
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Thomas V, Iftimie R. Toward Understanding the Dissociation of Weak Acids in Water: 1. Using IR Spectroscopy to Identify Proton-Shared Hydrogen-Bonded Ion-Pair Intermediates. J Phys Chem B 2008; 113:4152-60. [DOI: 10.1021/jp807378x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Vibin Thomas
- Département de Chimie, Université de Montréal, CP 6128, succursale Centre-Ville, Montréal, H3C3J7, Canada
| | - Radu Iftimie
- Département de Chimie, Université de Montréal, CP 6128, succursale Centre-Ville, Montréal, H3C3J7, Canada
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132
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Horvath S, McCoy AB, Roscioli JR, Johnson MA. Vibrationally Induced Proton Transfer in F−(H2O) and F−(D2O). J Phys Chem A 2008; 112:12337-44. [DOI: 10.1021/jp805616m] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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133
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Gardenier GH, Roscioli JR, Johnson MA. Intermolecular Proton Binding in the Presence of a Large Electric Dipole: Ar-Tagged Vibrational Predissociation Spectroscopy of the CH3CN·H+·OH2 and CH3CN·D+·OD2 Complexes. J Phys Chem A 2008; 112:12022-6. [DOI: 10.1021/jp800948s] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- George H. Gardenier
- Sterling Chemistry Laboratory, Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520
| | - Joseph R. Roscioli
- Sterling Chemistry Laboratory, Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520
| | - Mark A. Johnson
- Sterling Chemistry Laboratory, Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520
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134
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Mitchell-Koch KR, Thompson WH. Infrared spectra of a model phenol-amine proton transfer complex in nanoconfined CH3Cl. J Phys Chem B 2008; 112:7448-59. [PMID: 18517239 DOI: 10.1021/jp076714e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The vibrational spectra of a model phenol-amine proton transfer complex dissolved in CH3Cl solvent confined in a 12 A radius spherical hydrophobic cavity were calculated using mixed quantum-classical molecular dynamics simulations. The reaction free energy of the proton transfer complex was varied in order to explore the contributions to the vibrational absorption band from product and reactant species. The vibrational spectra of the model proton transfer complex resulted in motionally narrowed spectral linewidths with two distinct peaks for products and reactants in cases where the system undergoes chemical exchange. It was found that the n=1 and n=2 vibrational excited states combine to form diabatic states such that the spectra have contributions from both n=0 --> n=1 and n=0 --> n=2 transitions. A strong relationship between the instantaneous vibrational frequency and a collective solvent coordinate was found that assists in understanding the origin of the spectral features.
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135
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Li X, Moore DT, Iyengar SS. Insights from first principles molecular dynamics studies toward infrared multiple-photon and single-photon action spectroscopy: Case study of the proton-bound dimethyl ether dimer. J Chem Phys 2008; 128:184308. [DOI: 10.1063/1.2903446] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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136
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Iftimie R, Thomas V, Plessis S, Marchand P, Ayotte P. Spectral Signatures and Molecular Origin of Acid Dissociation Intermediates. J Am Chem Soc 2008; 130:5901-7. [DOI: 10.1021/ja077846o] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Radu Iftimie
- Départment de Chimie, Université de Montréal, CP 6128, succursale Centre-Ville, Montréal H3C3J7, Canada, and Département de Chimie, Université de Sherbrooke, 2500 Boulevard Université, Sherbrooke J1K2R1, Canada
| | - Vibin Thomas
- Départment de Chimie, Université de Montréal, CP 6128, succursale Centre-Ville, Montréal H3C3J7, Canada, and Département de Chimie, Université de Sherbrooke, 2500 Boulevard Université, Sherbrooke J1K2R1, Canada
| | - Sylvain Plessis
- Départment de Chimie, Université de Montréal, CP 6128, succursale Centre-Ville, Montréal H3C3J7, Canada, and Département de Chimie, Université de Sherbrooke, 2500 Boulevard Université, Sherbrooke J1K2R1, Canada
| | - Patrick Marchand
- Départment de Chimie, Université de Montréal, CP 6128, succursale Centre-Ville, Montréal H3C3J7, Canada, and Département de Chimie, Université de Sherbrooke, 2500 Boulevard Université, Sherbrooke J1K2R1, Canada
| | - Patrick Ayotte
- Départment de Chimie, Université de Montréal, CP 6128, succursale Centre-Ville, Montréal H3C3J7, Canada, and Département de Chimie, Université de Sherbrooke, 2500 Boulevard Université, Sherbrooke J1K2R1, Canada
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137
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Huang X, Habershon S, Bowman JM. Comparison of quantum, classical, and ring-polymer molecular dynamics infra-red spectra of Cl−(H2O) and H+(H2O)2. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2007.11.048] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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138
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Schneider H, Weber JM. Infrared spectra of SF6-.(H2O)n (n=1-3): incipient reaction and delayed onset of water network formation. J Chem Phys 2007; 127:244310. [PMID: 18163678 DOI: 10.1063/1.2815808] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We present data on the microsolvation of an extended charge distribution with SF(6)(-) as a model system. Infrared spectroscopy, aided by ab initio calculations, shows that the first two water molecules attach to the ion by a combination of single ionic H bonds, sharing one of the F atoms, and weak electrostatic interactions with other F atoms in the ion. No water-water bonds are formed at the dihydrate level, which is an unusual observation, given the strong propensity of water to form H-bonded networks. The onset of water networks occurs with the addition of the third water molecule. Moreover, the attachment of the first two water molecules considerably weakens the SF bond of the F atom involved in bonding to both ligands, indicating a possible mechanism for water-induced reactions.
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Affiliation(s)
- Holger Schneider
- JILA, NIST, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, USA
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139
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Asmis K, Yang Y, Santambrogio G, Brümmer M, Roscioli J, McCunn L, Johnson M, Kühn O. Gasphasen-Infrarotspektroskopie und mehrdimensionale quantenmechanische Rechnungen zum protonierten Ammoniakdimer N2H7+. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200702607] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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140
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Asmis K, Yang Y, Santambrogio G, Brümmer M, Roscioli J, McCunn L, Johnson M, Kühn O. Gas-Phase Infrared Spectroscopy and Multidimensional Quantum Calculations of the Protonated Ammonia Dimer N2H7+. Angew Chem Int Ed Engl 2007; 46:8691-4. [DOI: 10.1002/anie.200702607] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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141
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Schneider H, Vogelhuber KM, Weber JM. Infrared spectroscopy of anionic hydrated fluorobenzenes. J Chem Phys 2007; 127:114311. [PMID: 17887841 DOI: 10.1063/1.2768348] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We investigate the structural motifs of anionic hydrated fluorobenzenes by infrared photodissociation spectroscopy and density functional theory. Our calculations show that all fluorobenzene anions under investigation are strongly distorted from the neutral planar molecular geometries. In the anions, different F atoms are no longer equivalent, providing structurally different binding sites for water molecules and giving rise to a multitude of low-lying isomers. The absorption bands for hexa- and pentafluorobenzene show that only one isomer for the respective monohydrate complexes is populated in our experiment. For C6F6.-H2O, we can assign these bands to an isomer where water forms a weak double ionic hydrogen bond with two F atoms in the ion, in accord with the results of Bowen et al. [J. Chem. Phys. 127, 014312 (2007), following paper.] The spectroscopic motif of the binary complexes changes slightly with decreasing fluorination of the aromatic anion. For dihydrated hexafluorobenzene anions, several isomers are populated in our experiments, some of which may be due to hydrogen bonding between water molecules.
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Affiliation(s)
- Holger Schneider
- JILA, NIST, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, USA
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142
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Rheinecker J, Bowman JM. The calculated infrared spectrum of Cl-H2O using a new full dimensional ab initio potential surface and dipole moment surface. J Chem Phys 2007; 125:133206. [PMID: 17029453 DOI: 10.1063/1.2209675] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We report a full dimensional, ab initio-based global potential energy surface (PES) and dipole moment surface for Cl-H2O. Both surfaces are symmetric with respect to interchange of the H atoms. The PES is a fit to thousands of electronic energies calculated using the coupled-cluster method [CCSD(T)] with a moderately large basis (aug-cc-pVTZ). Vibrational energies and wave functions are accurately obtained using MULTIMODE. The wave function and dipole moment surface are used to calculate and analyze the pure infrared spectrum at 0 K which is compared with experiment. Vibrational energies and the infrared spectra for DOD and HOD/DOH are also presented.
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Affiliation(s)
- Jaime Rheinecker
- Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, USA
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143
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Abstract
A proton shared between two closed-shell molecules, [A.H+.B], constitutes a ubiquitous soft binding motif in biological processes. The vibrational transitions associated with the shared proton, which provide a direct probe of this interaction, have been extensively studied in the condensed phase but have yielded only limited detailed information because of their diffuse character. We exploited recent advances in gas-phase ion spectroscopy to identify sharp spectral features that can be assigned to both the shared proton and the two tethered molecules in a survey of 18 cold, isolated [A.H+.B] ions. These data yield a picture of the intermolecular proton bond at a microscopic scale, facilitating analysis of its properties within the context of a floppy polyatomic molecule.
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Affiliation(s)
- J R Roscioli
- Sterling Chemistry Laboratory, Yale University, Post Office Box 208107, New Haven, CT 06520, USA
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144
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Barbera J, Horvath S, Dribinski V, McCoy AB, Lineberger WC. Femtosecond dynamics of Cu(CD3OD). J Chem Phys 2007; 126:084307. [PMID: 17343448 DOI: 10.1063/1.2464103] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We report the femtosecond nuclear dynamics of Cu(CD3OD) van der Waals clusters, investigated using photodetachment-photoionization spectroscopy. Photodetachment of an electron from Cu-(CD3OD) with a 150 fs, 398 nm laser pulse produces a vibrationally excited neutral complex that undergoes ligand reorientation and dissociation. The dynamics of Cu(CD3OD) on the neutral surface is interrogated by delayed femtosecond resonant two-photon ionization. Analysis of the resulting time-dependent signals indicates that the nascent Cu(CD3OD) complex dissociates on two distinct time scales of 3 and 30 ps. To understand the origins of the observed time scales, complimentary studies were performed. These included measurement of the photoelectron spectrum of Cu-(CD3OD) as well as a series of calculations of the structure and the electronic and vibrational energies of the anion and neutral complexes. Based on the comparisons of the experimental and calculated results for Cu(CD3OD) with those obtained from earlier studies of Cu(H2O), we conclude that the 3 ps time scale reflects the energy transfer from the rotation of CD3OD in the complex to the dissociation coordinate, while the 30 ps time scale reflects the energy transfer from the excited methyl torsion states to the dissociation coordinate.
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Affiliation(s)
- Jack Barbera
- JILA, and Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, USA
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145
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Swalina C, Wang Q, Chakraborty A, Hammes-Schiffer S. Analysis of Nuclear Quantum Effects on Hydrogen Bonding. J Phys Chem A 2007; 111:2206-12. [PMID: 17388289 DOI: 10.1021/jp0682661] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The impact of nuclear quantum effects on hydrogen bonding is investigated for a series of hydrogen fluoride (HF)n clusters and a partially solvated fluoride anion, F-(H2O). The nuclear quantum effects are included using the path integral formalism in conjunction with the Car-Parrinello molecular dynamics (PICPMD) method and using the second-order vibrational perturbation theory (VPT2) approach. For the HF clusters, a directional change in the impact of nuclear quantum effects on the hydrogen-bonding strength is observed as the clusters evolve toward the condensed phase. Specifically, the inclusion of nuclear quantum effects increases the F-F distances for the (HF)n=2-4 clusters and decreases the F-F distances for the (HF)n>4 clusters. This directional change occurs because the enhanced electrostatic interactions between the HF monomers become more dominant than the zero point energy effects of librational modes as the size of the HF clusters increases. For the F-(H2O) system, the inclusion of nuclear quantum effects decreases the F-O distance and strengthens the hydrogen bonding interaction between the fluoride anion and the water molecule because of enhanced electrostatic interactions. The vibrationally averaged 19F shielding constant for F-(H2O) is significantly lower than the value for the equilibrium geometry, indicating that the electronic density on the fluorine decreases as a result of the quantum delocalization of the shared hydrogen. Deuteration of this system leads to an increase in the vibrationally averaged F-O distance and nuclear magnetic shielding constant because of the smaller degree of quantum delocalization for deuterium.
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Affiliation(s)
- Chet Swalina
- Department of Chemistry, 104 Chemistry Building, Pennsylvania State University, University Park, Pennsylvania 16802, USA
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146
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Maeyama T, Yagi I, Murota Y, Fujii A, Mikami N. Infrared Vibrational Autodetachment Spectroscopy of Microsolvated Benzonitrile Radical Anions. J Phys Chem A 2006; 110:13712-6. [PMID: 17181325 DOI: 10.1021/jp064389+] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Vibrational spectra of microsolvated benzonitrile radical anions (C6H5CN- -S; S = H2O and CH3OH) were measured by probing the electron detachment efficiency in the 3 microm region, representing resonance bands of autodetachment via OH stretching vibrations of the solvent molecules. The hydrogen-bonded OH band for both the cluster anions exhibited a large shift to the lower energy side with approximately 300 cm-1 compared to those for the corresponding neutral clusters. The solvent molecules are bound collinearly to the edge of the CN group of the benzonitrile anion in the cluster structures optimized with the density functional theory, in which the simulated vibrational energies are in good agreement with the observed band positions. Natural population analyses were performed for a qualitative implication in changes of solvent orientation upon electron attachment. Asymmetric band shapes depending on the vibrational modes are discussed with respect to dynamics of the autodetachment process from a theoretical aspect incorporated with density functional calculations.
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Affiliation(s)
- Toshihiko Maeyama
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan.
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147
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Crawford TD, Abrams ML, King RA, Lane JR, Schofield DP, Kjaergaard HG. The lowest A′2 excited state of the water-hydroxyl complex. J Chem Phys 2006; 125:204302. [PMID: 17144695 DOI: 10.1063/1.2388260] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Vertical and adiabatic excitation energies of the lowest (2)A(') excited state in the water-hydroxyl complex have been determined using coupled cluster, multireference configuration interaction, multireference perturbation theory, and density-functional methods. A significant redshift of about 0.4 eV in the vertical excitation energy of the complex compared to that of the hydroxyl radical monomer is found with the coupled cluster calculations validating previous results. Electronic excitation leads to a structure with near-equal sharing of the hydroxyl hydrogen by both oxygen atoms and a concomitantly large redshift of the adiabatic excitation energy of approximately 1 eV relative to the vertical excitation energy. The combination of redshifts ensures that the electronic transition in the complex lies well outside the equivalent excitation in the hydroxyl radical monomer. The complex is approximately five times more strongly bound in the excited state than in the ground state.
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148
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Abstract
Beginning in the mid-1980s, a number of innovative experimental studies on ionic clusters emerged from the laboratory of Yuan T. Lee combining infrared laser spectroscopy and tandem mass spectrometry. Coupled with modern electronic structure calculations, this research explored many facets of ionic clusters including solvation, structure, and dynamics. These efforts spawned a resurgence in gas-phase cluster spectroscopy. This paper will focus on the major areas of research initiated by the Lee group and how these studies stimulated and influenced others in what is currently a vibrant and growing field.
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Affiliation(s)
- James M Lisy
- Department of Chemistry, University of Illinois, Urbana, Illinois 61801, USA.
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149
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Herbert JM, Head-Gordon M. Charge Penetration and the Origin of Large O−H Vibrational Red-Shifts in Hydrated-Electron Clusters, (H2O)n-. J Am Chem Soc 2006; 128:13932-9. [PMID: 17044721 DOI: 10.1021/ja064949i] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The origin of O-H vibrational red-shifts observed experimentally in (H2O)n(-) clusters is analyzed using electronic structure calculations, including natural bond orbital analysis. The red-shifts are shown to arise from significant charge transfer and strong donor-acceptor stabilization between the unpaired electron and O-H sigma* orbitals on a nearby water molecule in a double hydrogen-bond-acceptor ("AA") configuration. The extent of e(-) --> sigma* charge transfer is comparable to the n --> sigma* charge transfer in the most strongly hydrogen-bonded X(-)(H2O) complexes (e.g., X = F, O, OH), even though the latter systems exhibit much larger vibrational red-shifts. In X(-)(H2O), the proton affinity of X(-) induces a low-energy XH...(-)OH diabatic state that becomes accessible in v = 1 of the shared-proton stretch, leading to substantial anharmonicity in this mode. In contrast, the H + (-)OH(H2O)(n-1) diabat of (H2O)n(-) is not energetically accessible; thus, the O-H stretching modes of the AA water are reasonably harmonic, and their red-shifts are less dramatic. Only a small amount of charge penetrates beyond the AA water molecule, even upon vibrational excitation of these AA modes. Implications for modeling of the aqueous electron are discussed.
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Affiliation(s)
- John M Herbert
- Department of Chemistry, University of California, Berkeley, California 94720, USA.
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