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Chng CP, Dowd A, Mechler A, Hsia KJ. Molecular dynamics simulations reliably identify vibrational modes in far-IR spectra of phospholipids. Phys Chem Chem Phys 2024; 26:18715-18726. [PMID: 38932689 DOI: 10.1039/d4cp00521j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/28/2024]
Abstract
The properties of self-assembled phospholipid membranes are of essential importance in biochemistry and physical chemistry, providing a platform for many cellular life functions. Far-infrared (far-IR) vibrational spectroscopy, on the other hand, is a highly information-rich method to characterize intermolecular interactions and collective behaviour of lipids that can help explain, e.g., chain packing, thermodynamic phase behaviour, and sequestration. However, reliable interpretation of the far-IR spectra is still lacking. Here we present a molecular dynamics (MD) based approach to simulate vibrational modes of individual lipids and in an ensemble. The results are a good match to synchrotron far-IR measurements and enable identification of the molecular motions corresponding to each vibrational mode, thus allowing the correct interpretation of membrane spectra with high accuracy and resolving the longstanding ambiguities in the literature in this regard. Our results demonstrate the feasibility of using MD simulations for interpreting far-IR spectra broadly, opening new avenues for practical use of this powerful method.
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Affiliation(s)
- Choon-Peng Chng
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Republic of Singapore.
| | - Annette Dowd
- School of Mathematical and Physical Sciences, University of Technology Sydney, Ultimo, NSW 2007, Australia
| | - Adam Mechler
- Department of Biochemistry and Chemistry, La Trobe Institute for Molecular Science, La Trobe University, Bundoora, Victoria 3086, Australia.
| | - K Jimmy Hsia
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore 639798, Republic of Singapore.
- School of Chemistry, Chemical Engineering and Biotechnology, Nanyang Technological University, Singapore 637459, Republic of Singapore
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2
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Shock CJ, Stevens MJ, Frischknecht AL, Nakamura I. Molecular dynamics simulations of the dielectric constants of salt-free and salt-doped polar solvents. J Chem Phys 2023; 159:134507. [PMID: 37795785 DOI: 10.1063/5.0165481] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Accepted: 09/15/2023] [Indexed: 10/06/2023] Open
Abstract
We develop a Stockmayer fluid model that accounts for the dielectric responses of polar solvents (water, MeOH, EtOH, acetone, 1-propanol, DMSO, and DMF) and NaCl solutions. These solvent molecules are represented by Lennard-Jones (LJ) spheres with permanent dipole moments and the ions by charged LJ spheres. The simulated dielectric constants of these liquids are comparable to experimental values, including the substantial decrease in the dielectric constant of water upon the addition of NaCl. Moreover, the simulations predict an increase in the dielectric constant when considering the influence of ion translations in addition to the orientation of permanent dipoles.
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Affiliation(s)
- Cameron J Shock
- Department of Physics, Michigan Technological University, Houghton, Michigan 49931, USA
| | - Mark J Stevens
- Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
| | - Amalie L Frischknecht
- Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, New Mexico 87185, USA
| | - Issei Nakamura
- Department of Physics, Michigan Technological University, Houghton, Michigan 49931, USA
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3
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Prabhu J, Singh AP, Vanni S. An in silico osmotic pressure approach allows characterization of pressure-area isotherms of lipid monolayers at low molecular areas. SOFT MATTER 2023; 19:3377-3385. [PMID: 37102755 PMCID: PMC10170484 DOI: 10.1039/d2sm01419j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Surface pressure-area isotherms of lipid monolayers at the air-water interface provide essential information about the structure and mechanical behaviour of lipid membranes. These curves can be readily obtained through Langmuir trough measurements and, as such, have been collected for decades in the field of membrane biochemistry. However, it is still challenging to directly observe and understand nanoscopic features of monolayers through such experiments, and molecular dynamics (MD) simulations are generally used to provide a molecular view of such interfaces. In MD simulations, the surface pressure-area (Π-A) isotherms are generally computed using the Kirkwood-Irving formula, that relies on the evaluation of the pressure tensor. This approach, however, has intrinsic limitations when the molecular area in the monolayer is low (typically < 60 Å2 per lipid). Recently, an alternative method to compute Π-A isotherms of surfactants, based on the calculation of the three-dimensional osmotic pressure via the implementation of semipermeable barriers was proposed. In this work, we investigate the feasibility of this approach for long-chain surfactants such as phospholipids. We identify some discrepancies between the computed values and experimental results, and we propose a semi-empirical correction based on the molecular structure of the surfactants at the monolayer interface. To validate the potential of this new approach, we simulate several phosphatidylcholine and phosphatidylethanolamine lipids at various temperatures using all-atom and coarse-grained force fields, and we compute the corresponding Π-A isotherms. Our results show that the Π-A isotherms obtained using the new method are in very good agreement with experiments and far superior to the canonical pressure tensor-based method at low molecular areas. This corrected osmotic pressure method allows for accurate characterization of the molecular packing in monolayers in various physical phases.
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Affiliation(s)
- Janak Prabhu
- Department of Biology, University of Fribourg, Chemin du Musée 10, 1700 Fribourg, Switzerland.
| | - Akhil Pratap Singh
- Department of Biology, University of Fribourg, Chemin du Musée 10, 1700 Fribourg, Switzerland.
| | - Stefano Vanni
- Department of Biology, University of Fribourg, Chemin du Musée 10, 1700 Fribourg, Switzerland.
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4
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Tan JA, Takahashi K. Vibrational spectrum of a 1D oscillator: The quantum, the Wigner, and the classical ways. J CHIN CHEM SOC-TAIP 2022. [DOI: 10.1002/jccs.202200398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Jake A. Tan
- Institute of Atomic and Molecular Sciences Academia Sinica Taipei Taiwan
| | - Kaito Takahashi
- Institute of Atomic and Molecular Sciences Academia Sinica Taipei Taiwan
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5
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Zheng RH, Wei WM. Sum-frequency vibrational spectroscopy of methanol at interfaces due to Fermi resonance. Phys Chem Chem Phys 2022; 24:27204-27211. [DOI: 10.1039/d2cp01808j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
We present a theoretical method of studying sum-frequency vibrational spectroscopy for the CH3 group of methanol at interfaces due to Fermi resonance, which provides a novel and untraditional point of view with respect to traditional approaches.
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Affiliation(s)
- Ren-Hui Zheng
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun, Beijing, 100190, P. R. China
| | - Wen-Mei Wei
- School of Basic Medical Science, Anhui Medical University, Hefei, Anhui, 230032, P. R. China
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6
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Kato T, Fujii A. How many methanol molecules effectively solvate an excess proton in the gas phase? Infrared spectroscopy of H +(methanol) n-benzene clusters. Phys Chem Chem Phys 2021; 24:163-171. [PMID: 34878469 DOI: 10.1039/d1cp04689f] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
An excess proton in a hydrogen-bonded system enhances the strength of hydrogen bonds of the surrounding molecules. The extent of this influence can be a measure of the number of molecules effectively solvating the excess proton. Such extent in methanol has been discussed by the observation of the π-hydrogen-bonded OH stretch bands of the terminal sites of protonated methanol clusters, H+(methanol)n, in benzene solutions, and it has been concluded that ∼8 molecules effectively solvate the excess proton (Stoyanov et al., Chem. Eur. J. 2008, 14, 3596-3604). In the present study, we performed infrared spectroscopy of H+(methanol)n-benzene clusters in the gas phase. The cluster size and hydrogen-bonded network structure are identified by the tandem mass spectrometric technique and the comparison of the observed infrared spectra with density functional theory calculations. Though changes of the preferred hydrogen bond network type occur with the increase of cluster size in the gas phase clusters, the observed size dependence of the π-hydrogen bonded OH frequency agrees well with that in the benzene solutions. This means that the observations in both the gas and condensed phases catch the same physical essence of the excess proton solvation by methanol.
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Affiliation(s)
- Takeru Kato
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
| | - Asuka Fujii
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.
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7
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Electric Field and Temperature Effects on the Ab Initio Spectroscopy of Liquid Methanol. APPLIED SCIENCES-BASEL 2021. [DOI: 10.3390/app11125457] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Although many H-bonded systems have been extensively investigated by means of infrared (IR) spectroscopy, the vibrational response to externally applied electric fields of polar liquids remains poorly investigated. However, local electric fields along with quantum-mechanical interactions rule the behavior of H-bonded samples at the molecular level. Among the many H-bonded systems, liquid methanol holds a key place in that it exhibits a very simple H-bond network where, on average, each molecule acts as a single H-bond donor and, at the same time, as a single H-bond acceptor. Here we report on the IR spectra emerging from a series of state-of-the-art ab initio molecular dynamics simulations of bulk liquid methanol under the action of static and homogeneous electric fields. In addition, the same analysis is here conducted in the absence of the external field and for different temperatures. Although some electric-field-induced effects resemble the response of other polar liquids (such as the global contraction of the IR spectrum upon field exposure), it turns out that, distinctly from water, the “electrofreezing” phenomenon is unlikely to happen in liquid methanol. Finally, we provide atomistic analyses magnifying the completely different nature of electric-field- and temperature-induced effects on bulk liquid methanol and on its vibrational response.
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8
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Mori W, Wang L, Sato Y, Morita A. Development of quadrupole susceptibility automatic calculator in sum frequency generation spectroscopy and application to methyl C-H vibrations. J Chem Phys 2020; 153:174705. [PMID: 33167643 DOI: 10.1063/5.0026341] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Sum frequency generation (SFG) spectroscopy has been established as a powerful interface probe technique based on the electric dipole approximation, while possible signals of quadrupole and bulk origin have also been known for a long time. In this work, we developed a computational tool, namely, Qsac (quadrupole susceptibility automatic calculator), to evaluate the comprehensive contributions of the dipole/quadrupole and interface/bulk in the arbitrary vibrational bands of SFG spectra. The calculations of relevant susceptibility terms are performed on the basis of the theory of energy representation using quantum chemical calculation and molecular dynamics simulation, which allows for semi-quantitative comparison among these terms on the same footing. We applied the Qsac to the methyl C-H stretching bands of organic molecules and found a general trend that the weak asymmetric bands are more sensitive to the bulk contribution than the symmetric ones. The phases of interface and bulk terms tend to cancel in the asymmetric band, which results in the reduced band intensity in the SFG spectra.
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Affiliation(s)
- Wataru Mori
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Lin Wang
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Yamato Sato
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
| | - Akihiro Morita
- Department of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
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9
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Hsu PJ, Shinkai T, Tai PH, Fujii A, Kuo JL. Effects of mixing between short-chain and branched-chain alcohols in protonated clusters. Phys Chem Chem Phys 2020; 22:13223-13239. [PMID: 32500878 DOI: 10.1039/d0cp01116a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The previous analysis of the neat protonated branched-chain alcohol clusters revealed the impact of steric repulsion and dispersion of the bulky alkyl group on the hydrogen-bonded (H-bonded) structures and their temperature-dependence. To further understand the influence of the alkyl groups in H-bonded clusters, we studied the mixing of the two extremes of alcohols, methanol (MeOH) and tert-butyl alcohol (t-BuOH), with an excess proton. Infrared spectroscopy and a structural search of first principles calculations on the size-selected clusters H+(MeOH)m(t-BuOH)t (m + t = 4 and 5) were conducted. Temperature-dependence of the dominant H-bonded structures was explored by the Ar-tagging technique and quantum harmonic superposition approach. By introducing the dispersion-corrected density functional theory methods, it was shown that the effects of dispersion due to the bulky alkyl groups in the mixed clusters cannot be ignored for t≥ 2. The computational results qualitatively depicted the characteristics of the observed IR spectra, but overestimation of the temperature-dependence with dispersion correction was clearly seen due to the unbalanced correction between linear H-bonded structures and compact cyclic ones. These results demonstrate the importance of extensive investigation and benchmarks on different levels of theory, and that a properly sampled structure database is crucial to evaluate theoretical models.
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Affiliation(s)
- Po-Jen Hsu
- Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan.
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10
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Yang D, Li Y, Liu X, Cao Y, Gao Y, Shen YR, Liu WT. Facet-specific interaction between methanol and TiO 2 probed by sum-frequency vibrational spectroscopy. Proc Natl Acad Sci U S A 2018; 115:E3888-E3894. [PMID: 29632204 PMCID: PMC5924933 DOI: 10.1073/pnas.1802741115] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The facet-specific interaction between molecules and crystalline catalysts, such as titanium dioxides (TiO2), has attracted much attention due to possible facet-dependent reactivity. Using surface-sensitive sum-frequency vibrational spectroscopy, we have studied how methanol interacts with different common facets of crystalline TiO2, including rutile(110), (001), (100), and anatase(101), under ambient temperature and pressure. We found that methanol adsorbs predominantly in the molecular form on all of the four surfaces, while spontaneous dissociation into methoxy occurs preferentially when these surfaces become defective. Extraction of Fermi resonance coupling between stretch and bending modes of the methyl group in analyzing adsorbed methanol spectra allows determination of the methanol adsorption isotherm. The isotherms obtained for the four surfaces are nearly the same, yielding two adsorbed Gibbs free energies associated with two different adsorption configurations singled out by ab initio calculations. They are (i) ∼-20 kJ/mol for methanol with its oxygen attached to a low-coordinated surface titanium, and (ii) ∼-5 kJ/mol for methanol hydrogen-bonded to a surface oxygen and a neighboring methanol molecule. Despite similar adsorption energetics, the Fermi resonance coupling strength for adsorbed methanol appears to depend sensitively on the surface facet and coverage.
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Affiliation(s)
- Deheng Yang
- State Key Laboratory of Surface Physics, Physics Department, Fudan University, Shanghai 200433, China
- Key Laboratory of Micro and Nano Photonic Structures, Fudan University, Shanghai 200433, China
| | - Yadong Li
- Division of Interfacial Water, Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, 201800 Shanghai, China
| | - Xinyi Liu
- State Key Laboratory of Surface Physics, Physics Department, Fudan University, Shanghai 200433, China
- Key Laboratory of Micro and Nano Photonic Structures, Fudan University, Shanghai 200433, China
| | - Yue Cao
- State Key Laboratory of Surface Physics, Physics Department, Fudan University, Shanghai 200433, China
- Key Laboratory of Micro and Nano Photonic Structures, Fudan University, Shanghai 200433, China
| | - Yi Gao
- Division of Interfacial Water, Key Laboratory of Interfacial Physics and Technology, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, 201800 Shanghai, China;
| | - Y Ron Shen
- State Key Laboratory of Surface Physics, Physics Department, Fudan University, Shanghai 200433, China;
- Key Laboratory of Micro and Nano Photonic Structures, Fudan University, Shanghai 200433, China
- Department of Physics, University of California, Berkeley, CA 94720
| | - Wei-Tao Liu
- State Key Laboratory of Surface Physics, Physics Department, Fudan University, Shanghai 200433, China;
- Key Laboratory of Micro and Nano Photonic Structures, Fudan University, Shanghai 200433, China
- Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
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11
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Zheng RH, Wei WM, Xu M, Shi Q. Sum-frequency vibrational spectroscopy of limonene chiral liquids due to the nonadiabatic effect. Phys Chem Chem Phys 2018; 20:7053-7058. [PMID: 29473923 DOI: 10.1039/c7cp08473k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using quantum computations we study sum-frequency vibrational spectroscopy of limonene chiral liquids due to the nonadiabatic effect in the non-resonant case for the first time. The nonadiabatic effect has an important impact on non-resonant antisymmetric polarizability and chiral sum-frequency vibrational spectroscopy. The theoretical spectroscopy agrees with the experimental spectroscopy. However, the nonadiabatic effect only has a small influence on non-resonant Raman. Bulk sum-frequency vibrational spectroscopy may become a powerful method of investigating the nonadiabatic effect and the nonradiative transition between excited electronic states for chiral molecules.
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Affiliation(s)
- Ren-Hui Zheng
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun, Beijing 100190, P. R. China.
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12
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Kiefer J, Wagenfeld S, Kerlé D. Chain length effects on the vibrational structure and molecular interactions in the liquid normal alkyl alcohols. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 189:57-65. [PMID: 28800430 DOI: 10.1016/j.saa.2017.07.061] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 07/03/2017] [Accepted: 07/30/2017] [Indexed: 06/07/2023]
Abstract
Alkyl alcohols are widely used in academia, industry, and our everyday lives, e.g. as cleaning agents and solvents. Vibrational spectroscopy is commonly used to identify and quantify these compounds, but also to study their structure and behavior. However, a comprehensive investigation and comparison of all normal alkanols that are liquid at room temperature has not been performed, surprisingly. This study aims at bridging this gap with a combined experimental and computational effort. For this purpose, the alkyl alcohols from methanol to undecan-1-ol have been analyzed using infrared and Raman spectroscopy. A detailed assignment of the individual peaks is presented and the influence of the alkyl chain length on the hydrogen bonding network is discussed. A 2D vibrational mapping allows a straightforward visualization of the effects. The conclusions drawn from the experimental data are backed up with results from Monte Carlo simulations using the simulation package Cassandra.
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Affiliation(s)
- Johannes Kiefer
- Technische Thermodynamik, Universität Bremen, Badgasteiner Str. 1, 28359 Bremen, Germany; MAPEX Center of Materials and Processes, Universität Bremen, Germany; School of Engineering, University of Aberdeen, Fraser Noble Building, Aberdeen AB24 3UE, UK; Erlangen Graduate School in Advanced Optical Technologies (SAOT), Universität Erlangen-Nürnberg, Germany.
| | - Sabine Wagenfeld
- Technische Thermodynamik, Universität Bremen, Badgasteiner Str. 1, 28359 Bremen, Germany
| | - Daniela Kerlé
- Technische Thermodynamik, Universität Bremen, Badgasteiner Str. 1, 28359 Bremen, Germany; MAPEX Center of Materials and Processes, Universität Bremen, Germany
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13
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Fujii A, Sugawara N, Hsu PJ, Shimamori T, Li YC, Hamashima T, Kuo JL. Hydrogen bond network structures of protonated short-chain alcohol clusters. Phys Chem Chem Phys 2018; 20:14971-14991. [DOI: 10.1039/c7cp08072g] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Protonated alcohol clusters enable extraction of the physical essence of the nature of hydrogen bond networks.
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Affiliation(s)
- Asuka Fujii
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
| | - Natsuko Sugawara
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
| | - Po-Jen Hsu
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei 10617
- Taiwan
| | - Takuto Shimamori
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
| | - Ying-Cheng Li
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei 10617
- Taiwan
| | - Toru Hamashima
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
| | - Jer-Lai Kuo
- Institute of Atomic and Molecular Sciences
- Academia Sinica
- Taipei 10617
- Taiwan
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14
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Serra PB, Rocha MA, Rathke B, Růžička K, Fulem M, Kiefer J. Infrared spectroscopy of the symmetric branched isomers of n-heptanol. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2017.09.023] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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15
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Wang L, Ishiyama T, Morita A. Theoretical Investigation of C–H Vibrational Spectroscopy. 1. Modeling of Methyl and Methylene Groups of Ethanol with Different Conformers. J Phys Chem A 2017; 121:6687-6700. [DOI: 10.1021/acs.jpca.7b05320] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Lin Wang
- Department
of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
- Elements
Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Kyoto 615-8520, Japan
| | - Tatsuya Ishiyama
- Department
of Applied Chemistry, Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan
| | - Akihiro Morita
- Department
of Chemistry, Graduate School of Science, Tohoku University, Aoba-ku, Sendai 980-8578, Japan
- Elements
Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Kyoto 615-8520, Japan
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16
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Wang L, Ishiyama T, Morita A. Theoretical Investigation of C-H Vibrational Spectroscopy. 2. Unified Assignment Method of IR, Raman, and Sum Frequency Generation Spectra of Ethanol. J Phys Chem A 2017; 121:6701-6712. [PMID: 28799753 DOI: 10.1021/acs.jpca.7b05378] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Using the flexible and polarizable model in the preceding paper, we performed comprehensive analysis of C-H stretching vibrations of ethanol and partially deuterated ones by molecular dynamics (MD) simulation. The overlapping band structures of the C-H stretching region including (i) methyl and methylene, (ii) the number of modes with Fermi resonances, and (iii) different trans/gauche conformers are disentangled by various analysis methods, such as isotope exchange, empirical potential parameter shift analysis, and separate calculations of conformers. The present analysis with MD simulation revealed unified assignment of infrared, Raman, and sum frequency generation (SFG) spectra. The analysis confirmed that the different conformers have significant influence on the assignment of CH2 vibrations. Band components and their signs in the imaginary χ(2) spectra of SFG under various polarizations are also understood from the common assignment with the infrared and Raman spectra.
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Affiliation(s)
- Lin Wang
- Department of Chemistry, Graduate School of Science, Tohoku University , Aoba-ku, Sendai 980-8578, Japan.,Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University , Kyoto 615-8520, Japan
| | - Tatsuya Ishiyama
- Department of Applied Chemistry, Graduate School of Science and Engineering, University of Toyama , Toyama 930-8555, Japan
| | - Akihiro Morita
- Department of Chemistry, Graduate School of Science, Tohoku University , Aoba-ku, Sendai 980-8578, Japan.,Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University , Kyoto 615-8520, Japan
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17
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Kiefer J. Simultaneous Acquisition of the Polarized and Depolarized Raman Signal with a Single Detector. Anal Chem 2017; 89:5725-5728. [PMID: 28485926 DOI: 10.1021/acs.analchem.7b01106] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Polarization-resolved Raman spectroscopy provides much more information than its conventional counterpart. However, it usually either requires a complicated setup with two spectrographs and detectors or two measurements must be performed sequentially. This study presents a simple and straightforward approach to recording both polarization components simultaneously with a single spectrograph and detector. The vertically and a horizontally polarized laser beam exiting a Wollaston prism are focused into the sample with a small spatial separation. The scattered light from both beams is imaged onto the slit of an imaging spectrograph as two spatially separated signals, i.e., the polarized and the depolarized Raman signal. Eventually, both spectra are acquired on a single CCD chip simultaneously. Experimental data of ethanol and dimethyl sulfoxide are shown as proof-of-concept. The new method has a number of advantages, for example, laser intensity fluctuations and the polarization dependence of the diffraction grating do not play a role. The proposed approach will be useful for an improved structural analysis and it will be the enabling technology for temporally resolved enantioselective Raman (esR) spectroscopy.
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Affiliation(s)
- Johannes Kiefer
- Technische Thermodynamik and MAPEX Center for Materials and Processes, Universität Bremen , Badgasteiner Strasse 1, 28359 Bremen, Germany.,School of Engineering, University of Aberdeen , Aberdeen AB24 3UE, United Kingdom.,Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg , Erlangen, Germany
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18
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Ishiyama T, Morita A. Computational Analysis of Vibrational Sum Frequency Generation Spectroscopy. Annu Rev Phys Chem 2017; 68:355-377. [DOI: 10.1146/annurev-physchem-052516-044806] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Tatsuya Ishiyama
- Department of Applied Chemistry, Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan
| | - Akihiro Morita
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
- Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Kyoto 615-8520, Japan
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19
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Ishiyama T, Morita A, Tahara T. Molecular dynamics study of two-dimensional sum frequency generation spectra at vapor/water interface. J Chem Phys 2015; 142:212407. [DOI: 10.1063/1.4914299] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Affiliation(s)
- Tatsuya Ishiyama
- Department of Applied Chemistry, Graduate School of Science and Engineering, University of Toyama, Toyama 930-8555, Japan
| | - Akihiro Morita
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan and Elements Strategy Initiative for Catalysts and Batteries (ESICB), Kyoto University, Kyoto 615-8520, Japan
| | - Tahei Tahara
- Molecular Spectroscopy Laboratory, RIKEN and Ultrafast Spectroscopy Research Team, RIKEN Center for Advanced Photonics (RAP), 2-1 Hirosawa, Wako 351-0198, Japan
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20
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Iwahashi T, Ishiyama T, Sakai Y, Morita A, Kim D, Ouchi Y. Liquid/liquid interface layering of 1-butanol and [bmim]PF6 ionic liquid: a nonlinear vibrational spectroscopy and molecular dynamics simulation study. Phys Chem Chem Phys 2015; 17:24587-97. [DOI: 10.1039/c5cp03307a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
IV-SFG vibrational spectroscopy and MD simulation studies reveal a local polar/nonpolar layering structure at the interface of 1-butanol-d9 and 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim]PF6).
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Affiliation(s)
- Takashi Iwahashi
- Department of Organic and Polymeric Materials
- Tokyo Institute of Technology
- Tokyo
- Japan
| | - Tatsuya Ishiyama
- Department of Applied Chemistry
- Graduate School of Science and Engineering
- University of Toyama
- Toyama 930-8555
- Japan
| | - Yasunari Sakai
- Department of Organic and Polymeric Materials
- Tokyo Institute of Technology
- Tokyo
- Japan
| | - Akihiro Morita
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai
- Japan
| | - Doseok Kim
- Department of Physics
- Sogang University
- Seoul
- Republic of Korea
| | - Yukio Ouchi
- Department of Organic and Polymeric Materials
- Tokyo Institute of Technology
- Tokyo
- Japan
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21
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Valley NA, Blower PG, Wood SR, Plath KL, McWilliams LE, Richmond GL. Doubling Down: Delving into the Details of Diacid Adsorption at Aqueous Surfaces. J Phys Chem A 2014; 118:4778-89. [DOI: 10.1021/jp501498h] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Nicholas A. Valley
- Department of Chemistry, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403, United States
| | - Patrick G. Blower
- Department of Chemistry, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403, United States
| | - Suzannah R. Wood
- Department of Chemistry, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403, United States
| | - Kathryn L. Plath
- Department of Chemistry, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403, United States
| | - Laura E. McWilliams
- Department of Chemistry, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403, United States
| | - Geraldine L. Richmond
- Department of Chemistry, University of Oregon, 1253 University of Oregon, Eugene, Oregon 97403, United States
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22
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Nagasaka M, Mochizuki K, Leloup V, Kosugi N. Local Structures of Methanol–Water Binary Solutions Studied by Soft X-ray Absorption Spectroscopy. J Phys Chem B 2014; 118:4388-96. [DOI: 10.1021/jp4091602] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Masanari Nagasaka
- The
Institute
for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
- The Graduate University
for Advanced Studies, Myodaiji, Okazaki 444-8585, Japan
| | - Kenji Mochizuki
- The Graduate University
for Advanced Studies, Myodaiji, Okazaki 444-8585, Japan
| | - Valentin Leloup
- The
Institute
for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
| | - Nobuhiro Kosugi
- The
Institute
for Molecular Science, Myodaiji, Okazaki 444-8585, Japan
- The Graduate University
for Advanced Studies, Myodaiji, Okazaki 444-8585, Japan
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23
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Van Houteghem M, Ghysels A, Verstraelen T, Poelmans W, Waroquier M, Van Speybroeck V. Critical analysis of the accuracy of models predicting or extracting liquid structure information. J Phys Chem B 2014; 118:2451-70. [PMID: 24512612 DOI: 10.1021/jp411737s] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This work aims at a critical assessment of properties predicting or extracting information on the density and structure of liquids. State-of-the-art NVT and NpT molecular dynamics (MD) simulations have been performed on five liquids: methanol, chloroform, acetonitrile, tetrahydrofuran, and ethanol. These simulations allow the computation of properties based on first principles, including the equilibrium density and radial distribution functions (RDFs), characterizing the liquid structure. Refinements have been incorporated in the MD simulations by taking into account basis set superposition errors (BSSE). An extended BSSE model for an instantaneous evaluation of the BSSE corrections has been proposed, and their impact on the liquid properties has been assessed. If available, the theoretical RDFs have been compared with the experimentally derived RDFs. For some liquids, significant discrepancies have been observed, and a profound but critical investigation is presented to unravel the origin of these deficiencies. This discussion is focused on tetrahydrofuran where the experiment reveals some prominent peaks completely missing in any MD simulation. Experiments providing information on liquid structure consist mainly of neutron diffraction measurements offering total structure factors as the primary observables. The splitting of these factors in reciprocal space into intra- and intermolecular contributions is extensively discussed, together with their sensitivity in reproducing correct RDFs in coordinate space.
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Affiliation(s)
- Marc Van Houteghem
- Center for Molecular Modeling, QCMM Alliance Ghent-Brussels, Ghent University , Technologiepark 903, B-9052 Zwijnaarde, Belgium
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24
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Imoto S, Xantheas SS, Saito S. Ultrafast dynamics of liquid water: frequency fluctuations of the OH stretch and the HOH bend. J Chem Phys 2014; 139:044503. [PMID: 23901989 DOI: 10.1063/1.4813071] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Frequency fluctuations of the OH stretch and the HOH bend in liquid water are reported from the third-order response function evaluated using the TTM3-F potential for water. The simulated two-dimensional infrared spectra of the OH stretch are similar to previously reported theoretical results. The present study suggests that the frequency fluctuation of the HOH bend is faster than that of the OH stretch. The ultrafast loss of the frequency correlation of the HOH bend is due to the strong couplings with the OH stretch as well as the intermolecular hydrogen bond bend.
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Affiliation(s)
- Sho Imoto
- The Graduate University for Advanced Studies, Myodaiji, Okazaki, Aichi 444-8585, Japan
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25
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Cuellar KA, Munroe KL, Magers DH, Hammer NI. Noncovalent Interactions in Microsolvated Networks of Trimethylamine N-Oxide. J Phys Chem B 2013; 118:449-59. [DOI: 10.1021/jp408659n] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kristina A. Cuellar
- Department
of Chemistry and Biochemistry, University of Mississippi, P.O. Box 1848, University, Mississippi 38655, United States
| | - Katherine L. Munroe
- Department
of Chemistry and Biochemistry, Mississippi College, P.O. Box 4036, Clinton, Mississippi 39058, United States
| | - David H. Magers
- Department
of Chemistry and Biochemistry, Mississippi College, P.O. Box 4036, Clinton, Mississippi 39058, United States
| | - Nathan I. Hammer
- Department
of Chemistry and Biochemistry, University of Mississippi, P.O. Box 1848, University, Mississippi 38655, United States
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26
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Gurina DL, Petrenko VE, Antipova ML. Calculating the radial distribution functions of supercritical methanol by means of Car-Parrinello and classical molecular dynamics. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2013. [DOI: 10.1134/s0036024413070121] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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27
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Jang JH, Lydiatt F, Lindsay R, Baldelli S. Quantitative Orientation Analysis by Sum Frequency Generation in the Presence of Near-Resonant Background Signal: Acetonitrile on Rutile TiO2 (110). J Phys Chem A 2013; 117:6288-302. [DOI: 10.1021/jp401019p] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Joon Hee Jang
- Department of Chemistry, University of Houston, Houston, Texas, 77204-5003,
United States United States
| | - Francis Lydiatt
- School of Materials, University of Manchester, Manchester, M13 9PL, United
Kingdom
| | - Rob Lindsay
- School of Materials, University of Manchester, Manchester, M13 9PL, United
Kingdom
| | - Steven Baldelli
- Department of Chemistry, University of Houston, Houston, Texas, 77204-5003,
United States United States
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28
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Yu Y, Wang Y, Lin K, Hu N, Zhou X, Liu S. Complete Raman Spectral Assignment of Methanol in the C–H Stretching Region. J Phys Chem A 2013; 117:4377-84. [DOI: 10.1021/jp400886y] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yuanqin Yu
- School of Physics and Material
Science, Anhui University, Hefei, Anhui
230039, China
- Hefei National
Laboratory for
Physical Sciences at the Microscale, Department of Chemical
Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Yuxi Wang
- Hefei National
Laboratory for
Physical Sciences at the Microscale, Department of Chemical
Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Ke Lin
- Hefei National
Laboratory for
Physical Sciences at the Microscale, Department of Chemical
Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Naiyin Hu
- Hefei National
Laboratory for
Physical Sciences at the Microscale, Department of Chemical
Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Xiaoguo Zhou
- Hefei National
Laboratory for
Physical Sciences at the Microscale, Department of Chemical
Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Shilin Liu
- Hefei National
Laboratory for
Physical Sciences at the Microscale, Department of Chemical
Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
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29
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Pressure effects on the dynamics of ions and solvent molecules in liquid methanol under ambient and cold conditions: Importance of solvent's H-bonding network. J Mol Liq 2013. [DOI: 10.1016/j.molliq.2013.01.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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30
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Suzuoka D, Takahashi H, Ishiyama T, Morita A. Development of a methodology to compute solvation free energies on the basis of the theory of energy representation for solutions represented with a polarizable force field. J Chem Phys 2012; 137:214503. [DOI: 10.1063/1.4769075] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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31
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Sieffert N, Bühl M, Gaigeot MP, Morrison CA. Liquid Methanol from DFT and DFT/MM Molecular Dynamics Simulations. J Chem Theory Comput 2012; 9:106-18. [DOI: 10.1021/ct300784x] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Nicolas Sieffert
- Université Joseph Fourier Grenoble I, CNRS UMR-5250 Département de Chimie Moléculaire, 301 rue de la Chimie, 38041 Grenoble Cedex 9, France
| | - Michael Bühl
- EaStCHEM School of Chemistry, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9ST, United Kingdom
| | - Marie-Pierre Gaigeot
- Université d’Evry val d’Essonne, LAMBE UMR8587 Laboratoire Analyse et Modélisation pour la Biologie et l’Environnement, Blvd F. Mitterrand, Bat Maupertuis, 91025 Evry, France
- Institut Universitaire de France (IUF), 103 Blvd St Michel, 75005 Paris, France
| | - Carole A. Morrison
- EaStCHEM School of Chemistry, University of Edinburgh, King’s Buildings, West Mains Road, Edinburgh, EH9 3JJ, United Kingdom
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32
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Van Houteghem M, Verstraelen T, Ghysels A, Vanduyfhuys L, Waroquier M, Van Speybroeck V. Analysis of the basis set superposition error in molecular dynamics of hydrogen-bonded liquids: application to methanol. J Chem Phys 2012; 137:104506. [PMID: 22979873 DOI: 10.1063/1.4749929] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
An efficient protocol is presented to compensate for the basis set superposition error (BSSE) in DFT molecular dynamics (MD) simulations using localized Gaussian basis sets. We propose a classical correction term that can be added a posteriori to account for BSSE. It is tested to what extension this term will improve radial distribution functions (RDFs). The proposed term is pairwise between certain atoms in different molecules and was calibrated by fitting reference BSSE data points computed with the counterpoise method. It is verified that the proposed exponential decaying functional form of the model is valid. This work focuses on hydrogen-bonded liquids, i.e., methanol, and more specific on the intermolecular hydrogen bond, but in principle the method is generally applicable on any type of interaction where BSSE is significant. We evaluated the relative importance of the Grimme-dispersion versus BSSE and found that they are of the same order of magnitude, but with an opposite sign. Upon introduction of the correction, the relevant RDFs, obtained from MD, have amplitudes equal to experiment.
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Affiliation(s)
- Marc Van Houteghem
- Center for Molecular Modeling, QCMM Alliance Ghent-Brussels, Ghent University, Technologiepark 903, B-9052 Zwijnaarde, Belgium
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33
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Nakano H, Yamamoto T. Variational calculation of quantum mechanical/molecular mechanical free energy with electronic polarization of solvent. J Chem Phys 2012; 136:134107. [DOI: 10.1063/1.3699234] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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34
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Sokolov VV. Molecular dynamics simulation of liquid methanol. II. Unified assignment of infrared, raman, and sum frequency generation vibrational spectra in methyl C–H stretching region. J Chem Phys 2011; 134:024510. [DOI: 10.1063/1.3514146] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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35
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Ishiyama T, Morita A, Miyamae T. Surface structure of sulfuric acid solution relevant to sulfate aerosol: molecular dynamics simulation combined with sum frequency generation measurement. Phys Chem Chem Phys 2011; 13:20965-73. [DOI: 10.1039/c1cp21920k] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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