1
|
Xie F, Tikhonov DS, Schnell M. Electric nuclear quadrupole coupling reveals dissociation of HCl with a few water molecules. Science 2024; 384:1435-1440. [PMID: 38843353 DOI: 10.1126/science.ado7049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2024] [Accepted: 05/19/2024] [Indexed: 06/29/2024]
Abstract
Investigating the dissociation of acids in the presence of a limited number of water molecules is crucial for understanding various elementary chemical processes. In our study, focusing on HCl(H2O)n clusters (where HCl is hydrogen chloride and H2O is water) formed in a cold and isolated jet expansion, we used the nuclear quadrupole coupling tensor obtained through rotational spectroscopy to decipher the nature of the hydrogen-chlorine (H-Cl) chemical bond in a microaqueous environment. For n = 1 to 4, the H-Cl bond is covalent. At n = 5 and 7, the contact ion pair of H3O+Cl- is spontaneously formed within the hydrogen bond networks of book and cube acid-water clusters, respectively.
Collapse
Affiliation(s)
- Fan Xie
- Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
| | | | - Melanie Schnell
- Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
- Institut für Physikalische Chemie, Christian-Albrechts-Universität zu Kiel, 24118 Kiel, Germany
| |
Collapse
|
2
|
Zhuang L, Wang J, Wan J, Huang C. Why do dipole moments of HCl-water clusters fail to determine acid dissociation? Phys Chem Chem Phys 2024; 26:17910-17917. [PMID: 38888219 DOI: 10.1039/d4cp01316f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/20/2024]
Abstract
This paper quantitatively examines why dipole moments of HCl(H2O)n=1-8 cannot serve as the dissociation criterion for acid molecules using the Hirshfeld-I approach. Also, we propose the possible experimental parameter 〈P(HCl)〉, whose statistical average enables the assessment of acid dissociation in mixed clusters. Furthermore, our calculations reveal that a minimum of four water molecules are necessary to dissociate an HCl molecule.
Collapse
Affiliation(s)
- Lei Zhuang
- School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China.
| | - Jing Wang
- School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China.
| | - Jianguo Wan
- School of Physics, Nanjing University, Nanjing, Jiangsu 210093, China
| | - Chuanfu Huang
- School of Materials Science and Physics, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China.
| |
Collapse
|
3
|
Tachikawa H. Mechanism of ionic dissociation of HCl in the smallest water clusters. Phys Chem Chem Phys 2024; 26:3623-3631. [PMID: 38224187 DOI: 10.1039/d3cp05715a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2024]
Abstract
The dissociation of strong acids into water is a fundamental process in chemistry and biology. Determining the minimum number of water molecules that can result in an ionic dissociation of hydrochloric acid (HCl → H+ + Cl-) remains a challenging subject. In this study, the reactions of H2O with HCl(H2O)n-1 (HCl-H2O cluster), i.e., HCl(H2O)n-1 + H2O (n = 3-7), were investigated by using the direct ab initio molecular dynamics (AIMD) method. Direct AIMD calculations were performed to set the collision energy of H2O to zero for all trajectories. For n = 3, no reaction occurred. In contrast, HCl dissociated to H+ + Cl- at n = 4, forming a contact ion pair (cIP) and solvent-separated ion pair (ssIP) as products. The reactions were expressed as HCl(H2O)3 + H2O → H3O+(H2O)2Cl- (ssIP), and HCl(H2O)3 + H2O → H3O+(Cl-)(H2O)2 (cIP). The ion pair (IP) products were dependent on the collision site of H2O relative to HCl(H2O)3. For n = 5-7, both IPs were formed through the reaction between H2O and HCl(H2O)n-1 (n = 5-7). The reaction between HCl and (H2O)4 (HCl + (H2O)4 → HCl(H2O)4) was non-reactive in IP formation. The reaction mechanism was discussed based on the theoretical results.
Collapse
Affiliation(s)
- Hiroto Tachikawa
- Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan.
| |
Collapse
|
4
|
Felker PM, Bačić Z. Noncovalently bound molecular complexes beyond diatom–diatom systems: full-dimensional, fully coupled quantum calculations of rovibrational states. Phys Chem Chem Phys 2022; 24:24655-24676. [DOI: 10.1039/d2cp04005k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The methodological advances made in recent years have significantly extended the range and dimensionality of noncovalently bound molecular complexes for which full-dimensional quantum calculations of their rovibrational states are feasible.
Collapse
Affiliation(s)
- Peter M. Felker
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095-1569, USA
| | - Zlatko Bačić
- Department of Chemistry, New York University, New York, NY, 10003, USA
- Simons Center for Computational Physical Chemistry at New York University, USA
- NYU-ECNU Center for Computational Chemistry at NYU Shanghai, 3663 Zhongshan Road North, Shanghai, 200062, China
| |
Collapse
|
5
|
Zech A, Head-Gordon M. Dissociation of HCl in water nanoclusters: an energy decomposition analysis perspective. Phys Chem Chem Phys 2021; 23:26737-26749. [PMID: 34846396 DOI: 10.1039/d1cp04587c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
As known, small HCl-water nanoclusters display a particular dissociation behaviour, whereby at least four water molecules are required for the ionic dissociation of HCl. In this work, we examine how intermolecular interactions promote the ionic dissociation of such nanoclusters. To this end, a set of 45 HCl-water nanoclusters with up to four water molecules is introduced. Energy decomposition analysis based on absolutely localized molecular orbitals (ALMO-EDA) is employed in order to study the importance of frozen interaction, dispersion, polarization, and charge-transfer for the dissociation. The vertical ALMO-EDA scheme is applied to HCl-water clusters along a proton-transfer coordinate varying the amount of spectator water molecules. The corresponding ALMO-EDA results show a clear preference for the dissociated cluster only in the presence of four water molecules. Our analysis of adiabatic ALMO-EDA results reveals a push-pull mechanism for the destabilization of the HCl bond based on the synergy between forward and backward charge-transfer.
Collapse
Affiliation(s)
- Alexander Zech
- Kenneth S. Pitzer Center for Theoretical Chemistry, Department of Chemistry, University of California, Berkeley, California 94720, USA.
| | - Martin Head-Gordon
- Kenneth S. Pitzer Center for Theoretical Chemistry, Department of Chemistry, University of California, Berkeley, California 94720, USA. .,Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| |
Collapse
|
6
|
Felker PM, Bačić Z. Intra- and intermolecular rovibrational states of HCl-H2O and DCl-H2O dimers from full-dimensional and fully coupled quantum calculations. CHINESE J CHEM PHYS 2021. [DOI: 10.1063/1674-0068/cjcp2110189] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Peter M. Felker
- Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095-1569, USA
| | - Zlatko Bačić
- Department of Chemistry, New York University, New York 10003, USA
- NYU-ECNU Center for Computational Chemistry at NYU Shanghai, Shanghai 200062, China
| |
Collapse
|
7
|
Wagner JP, McDonald DC, Colley JE, Franke PR, Duncan MA. Infrared spectroscopy of the protonated HCl dimer and trimer. J Chem Phys 2021; 155:134302. [PMID: 34624978 DOI: 10.1063/5.0065477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The protonated HCl dimer and trimer complexes were prepared by pulsed discharges in supersonic expansions of helium or argon doped with HCl and hydrogen. The ions were mass selected in a reflectron time-of-flight spectrometer and investigated with photodissociation spectroscopy in the IR and near-IR regions. Anharmonic vibrational frequencies were computed with VPT2 at the MP2/cc-pVTZ level of theory. The Cl-H stretching fundamentals and overtones were measured in addition to stretch-torsion combinations. VPT2 theory at this level confirms the proton-bound structure of the dimer complex and provides a reasonably good description of the anharmonic vibrations in this system. The trimer has a HCl-HClH+-ClH structure in which a central chloronium ion is solvated by two HCl molecules via hydrogen bonding. VPT2 reproduces anharmonic frequencies for this system, including several combinations involving core ion Cl-H stretches, but fails to describe the relative band intensities.
Collapse
Affiliation(s)
- J Philipp Wagner
- Department of Chemistry, University of Georgia, 140 Cedar Street, Athens, Georgia 30602, USA
| | - David C McDonald
- Department of Chemistry, University of Georgia, 140 Cedar Street, Athens, Georgia 30602, USA
| | - Jason E Colley
- Department of Chemistry, University of Georgia, 140 Cedar Street, Athens, Georgia 30602, USA
| | - Peter R Franke
- Department of Chemistry, University of Georgia, 140 Cedar Street, Athens, Georgia 30602, USA
| | - Michael A Duncan
- Department of Chemistry, University of Georgia, 140 Cedar Street, Athens, Georgia 30602, USA
| |
Collapse
|
8
|
Felker PM, Liu Y, Li J, Bačić Z. DCl-H 2O, HCl-D 2O, and DCl-D 2O Dimers: Inter- and Intramolecular Vibrational States and Frequency Shifts from Fully Coupled Quantum Calculations on a Full-Dimensional Neural Network Potential Energy Surface. J Phys Chem A 2021; 125:6437-6449. [PMID: 34261318 DOI: 10.1021/acs.jpca.1c04662] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report full-dimensional and fully coupled quantum calculations of the inter- and intramolecular vibrational states of three isotopologues of the hydrogen chloride-water dimer: DCl-H2O (DH), HCl-D2O (HD), and DCl-D2O (DD). The present study extends our recent theoretical investigation of the nine-dimensional (9D) vibrational level structure of the HCl-H2O (HH) dimer [Liu, Y.; Li, J.; Felker, P. M.; Bačić, Z. Phys. Chem. Chem. Phys. 2021, 23, 7101-7114]. It employs the same accurate 9D permutation invariant polynomial-neural network potential energy surface and the highly efficient bound-state methodology. The objective of this work is to elucidate the isotopologue variations of a range of bound-state properties of the hydrogen chloride-water dimer and compare them to those of the HH dimer. In order to achieve this, for the isotopologues considered, the rigorous 9D quantum calculations performed encompass all intramolecular vibrational fundamentals, and their frequency shifts relative to the isolated monomer values, together with the low-lying intermolecular vibrational states in each of the intramolecular vibrational manifolds of interest. Moreover, for the ground state of each isotopologue, several informative vibrationally averaged intermolecular geometric properties of the dimer are computed, as well as the three rotational constants. The energies of the intermolecular inversion and rock modes, which mainly involve the motions of the water moiety, differ greatly for H2O and D2O, but are much less sensitive to whether the hydrogen chloride isotopologue is HCl or DCl. On the other hand, the excitation of the HCl/DCl stretch changes significantly the energies of the water inversion and rock modes. The DCl stretch frequency shift computed in 9D for the DD dimer, -114.91 cm-1, agrees extremely well with the corresponding experimental value of -115.20 cm-1 measured by Saykally and co-workers.
Collapse
Affiliation(s)
- Peter M Felker
- Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095-1569, United States
| | - Yang Liu
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
| | - Jun Li
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
| | - Zlatko Bačić
- Department of Chemistry, New York University, New York, New York 10003, United States.,NYU-ECNU Center for Computational Chemistry at NYU Shanghai, 3663 Zhongshan Road North, Shanghai 200062, China
| |
Collapse
|
9
|
Tripathi R, Durán Caballero L, Pérez de Tudela R, Hölzl C, Marx D. Unveiling Zwitterionization of Glycine in the Microhydration Limit. ACS OMEGA 2021; 6:12676-12683. [PMID: 34056419 PMCID: PMC8154221 DOI: 10.1021/acsomega.1c00869] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/17/2021] [Accepted: 03/24/2021] [Indexed: 06/12/2023]
Abstract
Charge separation under solvation stress conditions is a fundamental process that comes in many forms in doped water clusters. Yet, the mechanism of intramolecular charge separation, where constraints due to the molecular structure might be intricately tied to restricted solvation structures, remains largely unexplored. Microhydrated amino acids are such paradigmatic molecules. Ab initio simulations are carried out at 300 K in the frameworks of metadynamics sampling and thermodynamic integration to map the thermal mechanisms of zwitterionization using Gly(H2O) n with n = 4 and 10. In both cases, a similar water-mediated proton transfer chain mechanism is observed; yet, detailed analyses of thermodynamics and kinetics demonstrate that the charge-separated zwitterion is the preferred species only for n = 10 mainly due to kinetic stabilization. Structural analyses disclose that bifurcated H-bonded water bridges, connecting the cationic and anionic sites in the fluctuating microhydration network at room temperature, are enhanced in the transition-state ensemble exclusively for n = 10 and become overwhelmingly abundant in the stable zwitterion. The findings offer potential insights into charge separation under solvation stress conditions beyond the present example.
Collapse
|
10
|
Liu Y, Li J, Felker PM, Bačić Z. HCl–H2O dimer: an accurate full-dimensional potential energy surface and fully coupled quantum calculations of intra- and intermolecular vibrational states and frequency shifts. Phys Chem Chem Phys 2021; 23:7101-7114. [DOI: 10.1039/d1cp00865j] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The present work reports a new full-dimensional potential energy surface (PES) of the HCl–H2O dimer, and the first fully coupled 9D quantum calculations of the intra- and intermolecular vibrational states of the complex, utilizing this PES.
Collapse
Affiliation(s)
- Yang Liu
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 401331
- China
| | - Jun Li
- School of Chemistry and Chemical Engineering
- Chongqing University
- Chongqing 401331
- China
| | - Peter M. Felker
- Department of Chemistry and Biochemistry
- University of California
- Los Angeles
- USA
| | - Zlatko Bačić
- Department of Chemistry
- New York University
- New York
- USA
- NYU-ECNU Center for Computational Chemistry at NYU Shanghai
| |
Collapse
|
11
|
Pérez de Tudela R, Marx D. Generating Excess Protons in Microsolvated Acid Clusters under Ambient Conditions: An Issue of Configurational Entropy versus Internal Energy. Chemistry 2020; 26:11955-11959. [PMID: 32080914 PMCID: PMC7540491 DOI: 10.1002/chem.202000864] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Indexed: 11/29/2022]
Abstract
Acid dissociation, and thus liberation of excess protons in small water droplets, impacts on diverse fields such as interstellar, atmospheric or environmental chemistry. At cryogenic temperatures below 1 K, it is now well established that as few as four water molecules suffice to dissociate the generic strong acid HCl, yet temperature-driven recombination sets in simply upon heating that cluster. Here, the fundamental question is posed of how many more water molecules are required to stabilize a hydrated excess proton at room temperature. Ab initio path integral simulations disclose that not five, but six water molecules are needed at 300 K to allow for HCl dissociation independently from nuclear quantum effects. In order to provide the molecular underpinnings of these observations, the classical and quantum free energy profiles were decomposed along the dissociation coordinate in terms of the corresponding internal energy and entropy profiles. What decides in the end about acid dissociation, and thus ion pair formation, in a specific microsolvated water cluster at room temperature is found to be a fierce competition between classical configurational entropy and internal energy, where the former stabilizes the undissociated state whereas the latter favors dissociation. It is expected that these are generic findings with broad implications on acid-base chemistry depending on temperature in small water assemblies.
Collapse
Affiliation(s)
| | - Dominik Marx
- Lehrstuhl für Theoretische ChemieRuhr-Universität Bochum44780BochumGermany
| |
Collapse
|
12
|
Bresnahan CG, David R, Milet A, Kumar R. Ion Pairing in HCl-Water Clusters: From Electronic Structure Investigations to Multiconfigurational Force-Field Development. J Phys Chem A 2019; 123:9371-9381. [PMID: 31589444 DOI: 10.1021/acs.jpca.9b07775] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In the bulk, condensed-phase HCl exists as a dissociated Cl- ion and a proton that is delocalized over solvating water molecules. However, in the gas phase, HCl is covalent, and even on the introduction of hydrating water molecules, the HCl covalent state dominates small clusters and is relevant at larger clusters including 21 water molecules. Electronic structure calculations (at the MP2 level) and ab initio metadynamics simulations (at the DFT level) have been carried out on HCl-(H2O)n clusters with n = 2-22 to investigate distinct solvation environments in clusters from covalent HCl structure, to contact ion pairs and solvent-separated ion pairs. The data were further used to train and validate a multiconfigurational force-field for HCl-water clusters that incorporates covalent HCl states into the MS-EVB3.2 formalism. Additionally, the many-body interaction of the Cl- ion with water and the excess proton was modeled by the introduction of two geometric three-body terms that incorporates the dominant many-body interaction in an efficient noniterative manner.
Collapse
Affiliation(s)
- Caitlin G Bresnahan
- Department of Chemistry , 232 Choppin Hall , Louisiana State University , Baton Rouge , Louisiana 70803 , United States
| | - Rolf David
- Department of Chemistry , 232 Choppin Hall , Louisiana State University , Baton Rouge , Louisiana 70803 , United States.,Univ. Grenoble Alpes, CNRS, DCM , 38000 Grenoble , France
| | - Anne Milet
- Univ. Grenoble Alpes, CNRS, DCM , 38000 Grenoble , France
| | - Revati Kumar
- Department of Chemistry , 232 Choppin Hall , Louisiana State University , Baton Rouge , Louisiana 70803 , United States
| |
Collapse
|
13
|
Christensen EG, Steele RP. Probing the Partial Activation of Water by Open-Shell Interactions, Cl(H 2O) 1-4. J Phys Chem A 2019; 123:8657-8673. [PMID: 31513400 DOI: 10.1021/acs.jpca.9b07235] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The partial chemical activation of water by reactive radicals was examined computationally for small clusters of chlorine and water, Cl•(H2O)n=1-4. Using an automated isomer-search procedure, dozens of unique, stable structures were computed. Among the resulting structural classes were intact, hydrated-chlorine isomers, as well as hydrogen-abstracted (HCl)(OH)(H2O)n-1 configurations. The latter showed increased stability as the degree of hydration increased, until n = 4, where a new class of structures was discovered with a chloride ion bound to an oxidized water network. The electronic structure of these three structural classes was investigated, and spectral signatures of this hydration-based evolution were connected to these electronic properties. An ancillary outcome of this detailed computational analysis, including coupled-cluster benchmarks, was the calibration of cost-effective quantum chemistry methods for future studies of these radical-water complexes.
Collapse
Affiliation(s)
- Elizabeth G Christensen
- Department of Chemistry and Henry Eyring Center for Theoretical Chemistry , University of Utah , 315 South 1400 East , Salt Lake City , Utah 84112 , United States
| | - Ryan P Steele
- Department of Chemistry and Henry Eyring Center for Theoretical Chemistry , University of Utah , 315 South 1400 East , Salt Lake City , Utah 84112 , United States
| |
Collapse
|
14
|
Mani D, de Tudela RP, Schwan R, Pal N, Körning S, Forbert H, Redlich B, van der Meer AFG, Schwaab G, Marx D, Havenith M. Acid solvation versus dissociation at "stardust conditions": Reaction sequence matters. SCIENCE ADVANCES 2019; 5:eaav8179. [PMID: 31187059 PMCID: PMC6555628 DOI: 10.1126/sciadv.aav8179] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Accepted: 05/02/2019] [Indexed: 05/09/2023]
Abstract
Chemical reactions at ultralow temperatures are of fundamental importance to primordial molecular evolution as it occurs on icy mantles of dust nanoparticles or on ultracold water clusters in dense interstellar clouds. As we show, studying reactions in a stepwise manner in ultracold helium nanodroplets by mass-selective infrared (IR) spectroscopy provides an avenue to mimic these "stardust conditions" in the laboratory. In our joint experimental/theoretical study, in which we successively add H2O molecules to HCl, we disclose a unique IR fingerprint at 1337 cm-1 that heralds hydronium (H3O+) formation and, thus, acid dissociation generating solvated protons. In stark contrast, no reaction is observed when reversing the sequence by allowing HCl to interact with preformed small embryonic ice-like clusters. Our ab initio simulations demonstrate that not only reaction stoichiometry but also the reaction sequence needs to be explicitly considered to rationalize ultracold chemistry.
Collapse
Affiliation(s)
- Devendra Mani
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | | | - Raffael Schwan
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Nitish Pal
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Saskia Körning
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - Harald Forbert
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany
| | - Britta Redlich
- FELIX Laboratory, Institute for Molecules and Materials, Radboud University, 6325 ED Nijmegen, Netherlands
| | - A. F. G. van der Meer
- FELIX Laboratory, Institute for Molecules and Materials, Radboud University, 6325 ED Nijmegen, Netherlands
| | - Gerhard Schwaab
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44801 Bochum, Germany
| | - Dominik Marx
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany
- Corresponding author. (M.H.); (D.M.)
| | - Martina Havenith
- Lehrstuhl für Physikalische Chemie II, Ruhr-Universität Bochum, 44801 Bochum, Germany
- Corresponding author. (M.H.); (D.M.)
| |
Collapse
|
15
|
Li H, Kong X, Jiang L, Liu ZF. Size-Dependent Formation of an Ion Pair in HSO 4-(H 2O) n: A Molecular Model for Probing the Microsolvation of Acid Dissociation. J Phys Chem Lett 2019; 10:2162-2169. [PMID: 30995405 DOI: 10.1021/acs.jpclett.9b00699] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
With a p Ka of 2.0, HSO4- is not a strong acid as its dissociation percentage is only ∼10% in a solution of 1 M. However, our ab initio molecular dynamics and density functional theory calculations show that acid dissociation in the hydrate clusters, HSO4-(H2O) n, is quite facile at moderate sizes. It starts at around n = 12 and is completed by n = 16 when the energetics becomes very favorable. The dissociation explains the significant broadening at n = 16 in the S═O stretching region of the previously reported infrared photodissociation spectra for HSO4-(H2O) n as the solvation shell is tightened around the sulfate dianion and the proton. More importantly, HSO4-(H2O) n should provide an ideal model to probe the molecular details involved in an acid dissociation process.
Collapse
Affiliation(s)
- Huiyan Li
- Department of Chemistry and Centre for Scientific Modeling and Computation , Chinese University of Hong Kong , Shatin , Hong Kong , China
| | - Xiangtao Kong
- State Key Laboratory of Molecular Reaction Dynamics, Collaborative Innovation Center of Chemistry for Energy and Materials (iChEM) , Dalian Institute of Chemical Physics, Chinese Academy of Sciences , 457 Zhongshan Road , Dalian 116023 , China
| | - Ling Jiang
- State Key Laboratory of Molecular Reaction Dynamics, Collaborative Innovation Center of Chemistry for Energy and Materials (iChEM) , Dalian Institute of Chemical Physics, Chinese Academy of Sciences , 457 Zhongshan Road , Dalian 116023 , China
| | - Zhi-Feng Liu
- Department of Chemistry and Centre for Scientific Modeling and Computation , Chinese University of Hong Kong , Shatin , Hong Kong , China
- CUHK Shenzhen Research Institute , No. 10, Second Yuexing Road , Nanshan District, Shenzhen , China
| |
Collapse
|
16
|
Yang Y, Johnson CJ. Hydration motifs of ammonium bisulfate clusters of relevance to atmospheric new particle formation. Faraday Discuss 2019; 217:47-66. [DOI: 10.1039/c8fd00206a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have analyzed the binding motifs of water bound to a prototypical cluster containing three ammonium cations and two bisulfate anions using mass-selective vibrational spectroscopy and quantum chemical calculations.
Collapse
Affiliation(s)
- Yi Yang
- Department of Chemistry
- Stony Brook University
- Stony Brook
- USA
| | | |
Collapse
|
17
|
Pérez de Tudela R, Marx D. Acid Dissociation in HCl-Water Clusters is Temperature Dependent and Cannot be Detected Based on Dipole Moments. PHYSICAL REVIEW LETTERS 2017; 119:223001. [PMID: 29286767 DOI: 10.1103/physrevlett.119.223001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Indexed: 05/09/2023]
Abstract
The dissociation of acids in aqueous environments at low temperatures in the presence of a limited amount of water is underlying a wealth of processes from atmospheric to interstellar science. For the paradigmatic case of HCl(H_{2}O)_{n} clusters, our extensive ab initio path integral simulations quantify in terms of free energy differences and barriers that n=4 water molecules are indeed required to dissociate HCl at low temperatures. Increasing the temperature, however, reverses the process and thus counteracts dissociation by fluctuation-driven recombination. The size of the electric dipole moment is shown to not correlate with the acid being in its dissociated or molecular state, thus rendering its measurement as a function of n unable to detect the dissociation transition.
Collapse
Affiliation(s)
| | - Dominik Marx
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany
| |
Collapse
|
18
|
Zakai I, Varner ME, Gerber RB. Concerted transfer of multiple protons in acid-water clusters: [(HCl)(H 2O)] 2 and [(HF)(H 2O)] 4. Phys Chem Chem Phys 2017; 19:20641-20646. [PMID: 28737803 DOI: 10.1039/c7cp04006g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular dynamics simulations using directly ab initio potentials are carried out for the ionically bonded clusters [(Cl-)(H3O+)]2 and [(F-)(H3O+)]4 to explore their transitions to the hydrogen-bonded [(HCl)(H2O)]2 and [(HF)(H2O)]4 structures during the first picosecond of simulation. Both the ionic and the H-bonded structures that are formed are highly symmetric. It is found that proton transfers are concerted in all trajectories for [(Cl-)(H3O+)]2. For [(F-)(H3O+)]4, the fully concerted mechanism is dominant but partially concerted transfers of two or three protons at the same time also occur. The concerted mechanism also holds for the reverse process of ionization of neutral acid molecules. It is suggested that the high symmetry of the ionic and the H-bonded structures plays a role in the preference for concerted transfers. Possible implications of the results for proton transfers in other systems are discussed.
Collapse
Affiliation(s)
- I Zakai
- Institute of Chemistry and The Fritz Haber Research Center, The Hebrew University, Jerusalem 91904, Israel
| | | | | |
Collapse
|
19
|
Tachikawa H. Proton Transfer Rates in Ionized Hydrogen Chloride–Water Clusters: A Direct Ab Initio Molecular Dynamics Study. J Phys Chem A 2017; 121:5237-5244. [DOI: 10.1021/acs.jpca.7b05112] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hiroto Tachikawa
- Division of Applied Chemistry, Graduate
School of Engineering, Hokkaido University, Sapporo 060-8628, Japan
| |
Collapse
|
20
|
Xue RJ, Grofe A, Yin H, Qu Z, Gao J, Li H. Perturbation Approach for Computing Infrared Spectra of the Local Mode of Probe Molecules. J Chem Theory Comput 2017; 13:191-201. [PMID: 28068771 DOI: 10.1021/acs.jctc.6b00733] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Linear and two-dimensional infrared (IR) spectroscopy of site-specific probe molecules provides an opportunity to gain a molecular-level understanding of the local hydrogen-bonding network, conformational dynamics, and long-range electrostatic interactions in condensed-phase and biological systems. A challenge in computation is to determine the time-dependent vibrational frequencies that incorporate explicitly both nuclear quantum effects of vibrational motions and an electronic structural representation of the potential energy surface. In this paper, a nuclear quantum vibrational perturbation (QVP) method is described for efficiently determining the instantaneous vibrational frequency of a chromophore in molecular dynamics simulations. Computational efficiency is achieved through the use of (a) discrete variable representation of the vibrational wave functions, (b) a perturbation theory to evaluate the vibrational energy shifts due to solvent dynamic fluctuations, and (c) a combined QM/MM potential for the systems. It was found that first-order perturbation is sufficiently accurate, enabling time-dependent vibrational frequencies to be obtained on the fly in molecular dynamics. The QVP method is illustrated in the mode-specific linear and 2D-IR spectra of the H-Cl stretching frequency in the HCl-water clusters and the carbonyl stretching vibration of acetone in aqueous solution. To further reduce computational cost, a hybrid strategy was proposed, and it was found that the computed vibrational spectral peak position and line shape are in agreement with experimental results. In addition, it was found that anharmonicity is significant in the H-Cl stretching mode, and hydrogen-bonding interactions further enhance anharmonic effects. The present QVP method complements other computational approaches, including path integral-based molecular dynamics, and represents a major improvement over the electrostatics-based spectroscopic mapping procedures.
Collapse
Affiliation(s)
- Rui-Jie Xue
- Institute of Theoretical Chemistry, Jilin University , 2519 Jiefang Road, Changchun 130023, People's Republic of China
| | - Adam Grofe
- Department of Chemistry and Supercomputing Institute, University of Minnesota , 207 Pleasant Street, SE, Minneapolis, Minnesota 55455, United States
| | - He Yin
- Institute of Theoretical Chemistry, Jilin University , 2519 Jiefang Road, Changchun 130023, People's Republic of China
| | - Zexing Qu
- Institute of Theoretical Chemistry, Jilin University , 2519 Jiefang Road, Changchun 130023, People's Republic of China
| | - Jiali Gao
- Institute of Theoretical Chemistry, Jilin University , 2519 Jiefang Road, Changchun 130023, People's Republic of China.,Department of Chemistry and Supercomputing Institute, University of Minnesota , 207 Pleasant Street, SE, Minneapolis, Minnesota 55455, United States
| | - Hui Li
- Institute of Theoretical Chemistry, Jilin University , 2519 Jiefang Road, Changchun 130023, People's Republic of China
| |
Collapse
|
21
|
Boda M, Naresh Patwari G. Insights into acid dissociation of HCl and HBr with internal electric fields. Phys Chem Chem Phys 2017; 19:7461-7464. [DOI: 10.1039/c6cp08870h] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A critical electric field exerted by the solvent on the ionizable group leads to acid dissociation.
Collapse
Affiliation(s)
- Manjusha Boda
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
| | - G. Naresh Patwari
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
| |
Collapse
|
22
|
Zuraski K, Kwasniewski D, Samanta AK, Reisler H. Vibrational Predissociation of the HCl-(H 2O) 3 Tetramer. J Phys Chem Lett 2016; 7:4243-4247. [PMID: 27723347 DOI: 10.1021/acs.jpclett.6b01848] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The vibrational predissociation of the HCl-(H2O)3 tetramer, the largest HCl-(H2O)n cluster for which HCl is not predicted to be ionized, is reported. This work focuses on the predissociation pathway giving rise to H2O + HCl-(H2O)2 following IR laser excitation of the H-bonded OH stretch fundamental. H2O fragments are monitored state selectively by 2 + 1 resonance-enhanced multiphoton ionization (REMPI) combined with time-of-flight mass spectrometry (TOF-MS). Velocity map images of H2O in selected rotational levels are used to determine translational energy distributions from which the internal energy distributions in the pair-correlated cofragments are derived. From the maximum translational energy release, the bond dissociation energy, D0 = 2400 ± 100 cm-1, is determined for the investigated channel. The energy distributions in the fragments are broad, encompassing the entire range of allowed states. The importance of cooperative (nonpairwise) interactions is discussed.
Collapse
Affiliation(s)
- Kristen Zuraski
- Department of Chemistry, University of Southern California , Los Angeles, California 90089-0482, United States
| | - Daniel Kwasniewski
- Department of Chemistry, University of Southern California , Los Angeles, California 90089-0482, United States
| | - Amit K Samanta
- Department of Chemistry, University of Southern California , Los Angeles, California 90089-0482, United States
| | - Hanna Reisler
- Department of Chemistry, University of Southern California , Los Angeles, California 90089-0482, United States
| |
Collapse
|
23
|
Kryzhevoi NV. Microhydration of LiOH: Insight from electronic decays of core-ionized states. J Chem Phys 2016; 144:244302. [PMID: 27369510 DOI: 10.1063/1.4954661] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
We compute and compare the autoionization spectra of a core-ionized LiOH molecule both in its isolated and microhydrated states. Stepwise microhydration of LiOH leads to gradual elongation of the Li-OH bond length and finally to molecular dissociation. The accompanying changes in the local environment of the OH(-) and Li(+) counterions are reflected in the computed O 1s and Li 1s spectra. The role of solvent water molecules and the counterion in the spectral shape formation is assessed. Electronic decays of the microhydrated LiOH are found to be mostly intermolecular since the majority of the populated final states have at least one outer-valence vacancy outside the initially core-ionized ion, mainly on a neighboring water molecule. The charge delocalization occurs through the intermolecular Coulombic and electron transfer mediated decays. Both mechanisms are highly efficient that is partly attributed to hybridization of molecular orbitals. The computed spectral shapes are sensitive to the counterion separation as well as to the number and arrangement of solvent molecules. These sensitivities can be used for studying the local hydration structure of solvated ions in aqueous solutions.
Collapse
Affiliation(s)
- Nikolai V Kryzhevoi
- Theoretical Chemistry, Institute of Physical Chemistry, Heidelberg University, 69120 Heidelberg, Germany
| |
Collapse
|
24
|
Tandy J, Feng C, Boatwright A, Sarma G, Sadoon AM, Shirley A, Das Neves Rodrigues N, Cunningham EM, Yang S, Ellis AM. Communication: Infrared spectroscopy of salt-water complexes. J Chem Phys 2016; 144:121103. [DOI: 10.1063/1.4945342] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Jon Tandy
- Department of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom
| | - Cheng Feng
- Department of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom
| | - Adrian Boatwright
- Department of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom
| | - Gautam Sarma
- Department of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom
| | - Ahmed M. Sadoon
- Department of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom
| | - Andrew Shirley
- Department of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom
| | | | - Ethan M. Cunningham
- Department of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom
| | - Shengfu Yang
- Department of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom
| | - Andrew M. Ellis
- Department of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, United Kingdom
| |
Collapse
|
25
|
Calvo F, Yurtsever E, Birer Ö. Possible Formation of Metastable PAH Dimers upon Pickup by Helium Droplets. J Phys Chem A 2016; 120:1727-36. [DOI: 10.1021/acs.jpca.5b12394] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- F. Calvo
- Univ. Grenoble Alpes, LIPHY, F-38000 Grenoble, France
- CNRS, LIPHY, F-38000 Grenoble, France
| | - E. Yurtsever
- Koç University, Chemistry Department, Rumeli
Feneri Yolu, Sariyer 34450, Istanbul, Turkey
| | - Ö. Birer
- Koç University, Chemistry Department, Rumeli
Feneri Yolu, Sariyer 34450, Istanbul, Turkey
| |
Collapse
|
26
|
Samanta AK, Wang Y, Mancini JS, Bowman JM, Reisler H. Energetics and Predissociation Dynamics of Small Water, HCl, and Mixed HCl–Water Clusters. Chem Rev 2016; 116:4913-36. [DOI: 10.1021/acs.chemrev.5b00506] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Amit K. Samanta
- Department
of Chemistry, University of Southern California, Los Angeles, California 90089-0482, United States
| | - Yimin Wang
- Department
of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, United States
| | - John S. Mancini
- Department
of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, United States
| | - Joel M. Bowman
- Department
of Chemistry and Cherry L. Emerson Center for Scientific Computation, Emory University, Atlanta, Georgia 30322, United States
| | - Hanna Reisler
- Department
of Chemistry, University of Southern California, Los Angeles, California 90089-0482, United States
| |
Collapse
|
27
|
Vargas-Caamal A, Cabellos JL, Ortiz-Chi F, Rzepa HS, Restrepo A, Merino G. How Many Water Molecules Does it Take to Dissociate HCl? Chemistry 2016; 22:2812-8. [PMID: 26774026 DOI: 10.1002/chem.201504016] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Indexed: 11/07/2022]
Abstract
The potential energy surfaces of the HCl(H2O)n (n is the number of water molecules) clusters are systematically explored using density functional theory and high-level ab initio computations. On the basis of electronic energies, the number of water molecules needed for HCl dissociation is four as reported by some experimental groups. However, this number is five owing to the inclusion of entropic factors. Wiberg bond indices are calculated and analyzed, and the results provide a quadratic correlation and classification of clusters according to the nondissociated, partially dissociated, and fully dissociated character of the H-Cl bond. Our computations show that if temperature is not controlled during the experiment, the values obtained for the dipole moment (or for any measurable property) are susceptible to change, providing a different picture of the number of water molecules needed for HCl dissociation in a nanoscopic droplet.
Collapse
Affiliation(s)
- Alba Vargas-Caamal
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados, Unidad Mérida, Km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex, 97310, Mérida, Yuc., México
| | - Jose Luis Cabellos
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados, Unidad Mérida, Km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex, 97310, Mérida, Yuc., México
| | - Filiberto Ortiz-Chi
- Instituto Tecnológico Superior de Calkiní, Av. Ah-Canul s/n, Carr. Fed. Calkiní-Campeche, CP, 24900, Calkiní, Campeche, México
| | - Henry S Rzepa
- Department of Chemistry, Imperial College London, South Kensington campus, London, SW7 2AZ, UK
| | - Albeiro Restrepo
- Instituto de Química, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia.
| | - Gabriel Merino
- Departamento de Física Aplicada, Centro de Investigación y de Estudios Avanzados, Unidad Mérida, Km 6 Antigua Carretera a Progreso. Apdo. Postal 73, Cordemex, 97310, Mérida, Yuc., México.
| |
Collapse
|
28
|
|
29
|
Hollas D, Svoboda O, Slavíček P. Fragmentation of HCl–water clusters upon ionization: Non-adiabatic ab initio dynamics study. Chem Phys Lett 2015. [DOI: 10.1016/j.cplett.2015.01.019] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
30
|
Guggemos N, Slavíček P, Kresin VV. Electric dipole moments of nanosolvated acid molecules in water clusters. PHYSICAL REVIEW LETTERS 2015; 114:043401. [PMID: 25679889 DOI: 10.1103/physrevlett.114.043401] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Indexed: 06/04/2023]
Abstract
The electric dipole moments of (H2O)nDCl (n=3-9) clusters have been measured by the beam-deflection method. Reflecting the (dynamical) charge distribution within the system, the dipole moment contributes information about the microscopic structure of nanoscale solvation. The addition of a DCl molecule to a water cluster results in a strongly enhanced susceptibility. There is evidence for a noticeable rise in the dipole moment occurring at n≈5-6. This size is consistent with predictions for the onset of ionic dissociation. Additionally, a molecular-dynamics model suggests that even with a nominally bound impurity an enhanced dipole moment can arise due to the thermal and zero-point motion of the proton and the water molecules. The experimental measurements and the calculations draw attention to the importance of fluctuations in defining the polarity of water-based nanoclusters and generally to the essential role played by motional effects in determining the response of fluxional nanoscale systems under realistic conditions.
Collapse
Affiliation(s)
- Nicholas Guggemos
- Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089-0484, USA
| | - Petr Slavíček
- Department of Physical Chemistry, University of Chemistry and Technology, Prague, Technická 5, 16628 Prague, Czech Republic
| | - Vitaly V Kresin
- Department of Physics and Astronomy, University of Southern California, Los Angeles, California 90089-0484, USA
| |
Collapse
|
31
|
Complexation of Allyl Radicals and Hydrochloric Acid in Helium Nanodroplets. J Phys Chem A 2015; 119:1007-12. [DOI: 10.1021/jp511708s] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
32
|
Mancini JS, Bowman JM. Isolating the spectral signature of H3O+ in the smallest droplet of dissociated HCl acid. Phys Chem Chem Phys 2015; 17:6222-6. [DOI: 10.1039/c4cp05685j] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The smallest droplet of HCl acid, H3O+(H2O)3Cl−, and its isolated H3O+ infrared signature.
Collapse
Affiliation(s)
- John S. Mancini
- Cherry L. Emerson Center for Scientific Computation and Department of Chemistry
- Emory University
- Atlanta
- USA
| | - Joel M. Bowman
- Cherry L. Emerson Center for Scientific Computation and Department of Chemistry
- Emory University
- Atlanta
- USA
| |
Collapse
|
33
|
Zischang J, Skvortsov D, Choi MY, Mata RA, Suhm MA, Vilesov AF. Helium Nanodroplet Study of the Hydrogen-Bonded OH Vibrations in HCl–H2O Clusters. J Phys Chem A 2014; 119:2636-43. [DOI: 10.1021/jp509683g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Julia Zischang
- Institute
of Physical Chemistry, Georg-August-Universität Göttingen, Tammannstraße
6, 37077 Göttingen, Germany
| | - Dmitry Skvortsov
- Department
of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Myong Yong Choi
- Department
of Chemistry, University of Southern California, Los Angeles, California 90089, United States
- Department
of Chemistry and Research Institute of Natural Sciences, Gyeongsang National University, Jinju 660-701, South Korea
| | - Ricardo A. Mata
- Institute
of Physical Chemistry, Georg-August-Universität Göttingen, Tammannstraße
6, 37077 Göttingen, Germany
| | - Martin A. Suhm
- Institute
of Physical Chemistry, Georg-August-Universität Göttingen, Tammannstraße
6, 37077 Göttingen, Germany
| | - Andrey F. Vilesov
- Department
of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| |
Collapse
|
34
|
Lin W, Paesani F. Infrared Spectra of HCl(H2O)n Clusters from Semiempirical Born–Oppenheimer Molecular Dynamics Simulations. J Phys Chem A 2014; 119:4450-6. [DOI: 10.1021/jp509791n] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Wei Lin
- Department of Chemistry and Biochemistry, University of California San Diego 9500 Gilman Drive, La Jolla, California 92093, United States
| | - Francesco Paesani
- Department of Chemistry and Biochemistry, University of California San Diego 9500 Gilman Drive, La Jolla, California 92093, United States
| |
Collapse
|
35
|
Mancini JS, Bowman JM. Effects of Zero-Point Delocalization on the Vibrational Frequencies of Mixed HCl and Water Clusters. J Phys Chem Lett 2014; 5:2247-2253. [PMID: 26279542 DOI: 10.1021/jz500970h] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We demonstrate the significant effect that large-amplitude zero-point vibrational motion can have on the high-frequency fundamental vibrations of molecular clusters, specifically small (HCl)n-(H2O)m clusters. Calculations were conducted on a many-body potential, constructed from a mix of new and previously reported semiempirical and high-level ab initio potentials. Diffusion Monte Carlo simulations were performed to determine ground-state wave functions. Visualization of these wave functions indicates that the clusters exhibit delocalized ground states spanning multiple stationary point geometries. The ground states are best characterized by planar ring configurations, despite the clusters taking nonplanar configurations at their global minima. Vibrational calculations were performed at the global minima and the Diffusion Monte Carlo predicted configurations and also using an approach that spans multiple stationary points along a rectilinear normal-mode reaction path. Significantly better agreement was observed between the calculated vibrational frequencies and experimental peak positions when the delocalized ground state was accounted for.
Collapse
Affiliation(s)
- John S Mancini
- Cherry L. Emerson Center for Scientific Computation and Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| | - Joel M Bowman
- Cherry L. Emerson Center for Scientific Computation and Department of Chemistry, Emory University, Atlanta, Georgia 30322, United States
| |
Collapse
|
36
|
Walewski Ł, Forbert H, Marx D. Solvation of molecules in superfluid helium enhances the “interaction induced localization” effect. J Chem Phys 2014; 140:144305. [DOI: 10.1063/1.4870595] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
37
|
Kollipost F, Papendorf K, Lee YF, Lee YP, Suhm MA. Alcohol dimers – how much diagonal OH anharmonicity? Phys Chem Chem Phys 2014; 16:15948-56. [DOI: 10.1039/c4cp01418a] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The massive infrared attenuation and increased anharmonicity of OH stretching overtones in alcohol dimers is experimentally quantified.
Collapse
Affiliation(s)
- Franz Kollipost
- Georg-August-Universität Göttingen
- Institut für Physikalische Chemie
- 37077 Göttingen, Germany
| | - Kim Papendorf
- Georg-August-Universität Göttingen
- Institut für Physikalische Chemie
- 37077 Göttingen, Germany
| | - Yu-Fang Lee
- Department of Applied Chemistry and Institute of Molecular Science
- National Chiao Tung University
- Hsinchu 30010, Taiwan
| | - Yuan-Pern Lee
- Department of Applied Chemistry and Institute of Molecular Science
- National Chiao Tung University
- Hsinchu 30010, Taiwan
- Institute of Atomic and Molecular Sciences
- Academia Sinica
| | - Martin A. Suhm
- Georg-August-Universität Göttingen
- Institut für Physikalische Chemie
- 37077 Göttingen, Germany
| |
Collapse
|