1
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Sałdyka M, Mielke Z. UV Laser-Induced Photodecomposition of Matrix-Isolated Salicylhydroxamic Acid: Identification of New Isocyanate Complexes. Molecules 2024; 29:862. [PMID: 38398614 PMCID: PMC10892988 DOI: 10.3390/molecules29040862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 02/05/2024] [Accepted: 02/10/2024] [Indexed: 02/25/2024] Open
Abstract
Photochemical reactions of salicylhydroxamic acid were induced using tunable UV laser radiation followed by FTIR spectroscopy. Four pairs of co-products were experimentally found to appear in the photolysis: C6H4(OH)NCO⋯H2O (1), C6H4(OH)C(O)N⋯H2O (2), C6H4(OH)2⋯HNCO (3), and C6H4(OH)NHOH⋯CO (4). The comparison of the theoretical spectra with the experimental ones allowed us to determine the structures of the complexes formed in the matrices. The mechanisms of the reaction channels leading to the formation of the photoproducts were proposed. It was concluded that the first step in the formation of the complexes (1), (2), and (3) was the scission of the N-O bond, whereas the creation of complex (4) was due to cleavage of the C-N bond.
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Affiliation(s)
- Magdalena Sałdyka
- Faculty of Chemistry, University of Wroclaw, F. Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Zofia Mielke
- Faculty of Chemistry, University of Wroclaw, F. Joliot-Curie 14, 50-383 Wrocław, Poland
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2
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Tajouo Tela H, Quintas-Sánchez E, Dubernet ML, Scribano Y, Dawes R, Gatti F, Ndengué S. Rovibrational states calculations of the H 2O-HCN heterodimer with the multiconfiguration time dependent Hartree method. Phys Chem Chem Phys 2023; 25:31813-31824. [PMID: 37966067 DOI: 10.1039/d3cp03225f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2023]
Abstract
Water and hydrogen cyanide are two of the most common species in space and the atmosphere with the ability of binding to form dimers such as H2O-HCN. In the literature, while calculations characterizing various properties of the H2O-HCN cluster (equilibrium distance, vibrational frequencies and rotational constants) have been done in the past, extensive calculations of the rovibrational states of this system using a reliable quantum dynamical approach have yet to be reported. In this work, we intend to mend that by performing the first calculation of the rovibrational states of the H2O-HCN van der Waals complex on a recently developed potential energy surface. We use the block improved relaxation procedure implemented in the Heidelberg MultiConfiguration Time-Dependent Hartree (MCTDH) package to compute the states of the H2O-HCN isomer, from which we extract the transition frequencies and rotational constants of the complex. We further adapt an approach first suggested by Wang and Carrington-and supported here by analysis routines of the Heidelberg MCTDH package-to properly characterize the computed rovibrational states. The subsequent assignment of rovibrational states was done by theoretical analysis and visual inspection of the wavefunctions. Our simulations provide a Zero Point Energy (ZPE) and intermolecular vibrational frequencies in good agreement with past ab initio calculations. The transition frequencies and rotational constants obtained from our simulations match well with the available experimental data. This work has the broad aim to propose the MCTDH approach as a reliable option to compute and characterize rovibrational states of van der Waals complexes such as the current one.
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Affiliation(s)
- Hervé Tajouo Tela
- ICTP-East African Institute for Fundamental Research, University of Rwanda, Kigali, Rwanda.
| | - Ernesto Quintas-Sánchez
- Department of Chemistry, Missouri University of Science and Technology, 65409 Rolla, Missouri, USA
| | - Marie-Lise Dubernet
- LERMA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne University, UPMC Univ Paris 06, 75014 Paris, France
| | - Yohann Scribano
- Laboratoire Univers et Particules de Montpellier, UMR-CNRS 5299, Université de Montpellier, Place Eugène Bataillon, 34095 Montpellier, France
| | - Richard Dawes
- Department of Chemistry, Missouri University of Science and Technology, 65409 Rolla, Missouri, USA
| | - Fabien Gatti
- Institut de Sciences Moleculaires d'Orsay, UMR 8214, Université Paris-Sud - Université Paris-Saclay, 91405 Orsay, France
| | - Steve Ndengué
- ICTP-East African Institute for Fundamental Research, University of Rwanda, Kigali, Rwanda.
- Department of Physics, Trinity College, 06106 Hartford, Connecticut, USA
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3
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Vindel-Zandbergen P, Kȩdziera D, Żółtowski M, Kłos J, Żuchowski P, Felker PM, Lique F, Bačić Z. H2O-HCN complex: A new potential energy surface and intermolecular rovibrational states from rigorous quantum calculations. J Chem Phys 2023; 159:174302. [PMID: 37909452 DOI: 10.1063/5.0173751] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Accepted: 10/13/2023] [Indexed: 11/03/2023] Open
Abstract
In this work the H2O-HCN complex is quantitatively characterized in two ways. First, we report a new rigid-monomer 5D intermolecular potential energy surface (PES) for this complex, calculated using the symmetry-adapted perturbation theory based on density functional theory method. The PES is based on 2833 ab initio points computed employing the aug-cc-pVQZ basis set, utilizing the autoPES code, which provides a site-site analytical fit with the long-range region given by perturbation theory. Next, we present the results of the quantum 5D calculations of the fully coupled intermolecular rovibrational states of the H2O-HCN complex for the total angular momentum J values of 0, 1, and 2, performed on the new PES. These calculations rely on the quantum bound-state methodology developed by us recently and applied to a variety of noncovalently bound binary molecular complexes. The vibrationally averaged ground-state geometry of H2O-HCN determined from the quantum 5D calculations agrees very well with that from the microwave spectroscopic measurements. In addition, the computed ground-state rotational transition frequencies, as well as the B and C rotational constants calculated for the ground state of the complex, are in excellent agreement with the experimental values. The assignment of the calculated intermolecular vibrational states of the H2O-HCN complex is surprisingly challenging. It turns out that only the excitations of the intermolecular stretch mode can be assigned with confidence. The coupling among the angular degrees of freedom (DOFs) of the complex is unusually strong, and as a result most of the excited intermolecular states are unassigned. On the other hand, the coupling of the radial, intermolecular stretch mode and the angular DOFs is weak, allowing straightforward assignment of the excitation of the former.
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Affiliation(s)
| | - Dariusz Kȩdziera
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, ul. Gagarina 7, 87-100 Toruń, Poland
| | - Michał Żółtowski
- University of Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000 Rennes, France
- LOMC - UMR 6294, CNRS-Université du Havre, 25 rue Philippe Lebon, BP1123, 76 063 Le Havre cedex, France
| | - Jacek Kłos
- Joint Quantum Institute, University of Maryland, College Park, Maryland 20742, USA
| | - Piotr Żuchowski
- Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, ul. Grudziądzka 5, 87-100 Toruń, Poland
| | - Peter M Felker
- Department of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569, USA
| | - François Lique
- University of Rennes, CNRS, IPR (Institut de Physique de Rennes) - UMR 6251, F-35000 Rennes, France
| | - Zlatko Bačić
- Department of Chemistry, New York University, New York, New York 10003, USA
- Simons Center for Computational Physical Chemistry at New York University, New York, New York 10003, USA
- NYU-ECNU Center for Computational Chemistry at NYU Shanghai, 3663 Zhongshan Road North, Shanghai 200062, China
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4
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Paranjothy M. Theoretical Investigation of Dissociation versus Intramolecular Rearrangements in Aminohydroxymethylene. J Phys Chem A 2022; 126:6927-6933. [PMID: 36130264 DOI: 10.1021/acs.jpca.2c04950] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Aminohydroxymethylene (H2N-C̈-OH) is the simplest aminooxycarbene which is a heteroatom stabilized carbene. This highly reactive molecule was prepared in an Ar matrix in a recent experimental work. Unimolecular reactivity of this astrochemically important molecule was investigated and only fragmentations were identified contrary to the observations of both fragmentations and intramolecular rearrangements in other hydroxycarbenes. These rearrangement reactions form the corresponding imine and carbonyl compounds. In the present work, direct chemical dynamics simulations of unimolecular chemistry of aminohydroxymethylene were performed in the gas phase to study atomic level dissociation mechanisms. Classical trajectories were generated on-the-fly using potentials and gradients computed at the density functional B3LYP/6-31+G* level of electronic structure theory. Simulation results showed that intramolecular rearrangements accompany fragmentations during the unimolecular decay process of aminohydroxymethylene. However, the average lifetime of the intermediate isomers were found to be only few picoseconds which might not have been long enough for detection in the experiments.
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Affiliation(s)
- Manikandan Paranjothy
- Department of Chemistry, Indian Institute of Technology Jodhpur, Jodhpur, Rajasthan 342037, India
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5
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Hockey EK, Vlahos K, Howard T, Palko J, Dodson LG. Weakly Bound Complex Formation between HCN and CH 3Cl: A Matrix-Isolation and Computational Study. J Phys Chem A 2022; 126:3110-3123. [PMID: 35583384 DOI: 10.1021/acs.jpca.2c00716] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The matrix-isolated infrared spectrum of a hydrogen cyanide-methyl chloride complex was investigated in a solid argon matrix. HCN and CH3Cl were co-condensed onto a substrate held at 10 K with an excess of argon gas, and the infrared spectrum was measured using Fourier-transform infrared spectroscopy. Quantum chemical geometry optimization, harmonic frequency, and natural bonding orbital calculations indicate stabilized hydrogen- and halogen-bonded structures. The two resulting weakly bound complexes are both composed of one CH3Cl molecule bound to a (HCN)3 subunit, where the three HCN molecules are bound head-to-tail in a ring formation. Our study suggests that─in the presence of CH3Cl─the formation of (HCN)3 is promoted through complexation. Since HCN aggregates are an important precursor to prebiotic monomers (amino acids and nucleobases) and other life-bearing polymers, this study has astrophysical implications toward the search for life in space.
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Affiliation(s)
- Emily K Hockey
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Korina Vlahos
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Thomas Howard
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Jessica Palko
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Leah G Dodson
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States
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6
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Volosatova AD, Lukianova MA, Zasimov PV, Feldman VI. Direct evidence for a radiation-induced synthesis of acetonitrile and isoacetonitrile from a 1 : 1 CH 4HCN complex at cryogenic temperatures: is it a missing link between inorganic and prebiotic astrochemistry? Phys Chem Chem Phys 2021; 23:18449-18460. [PMID: 34612385 DOI: 10.1039/d1cp01598b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Nitriles are important constituents of extraterrestrial media. Nitriles are supposed to play a crucial role in prebiotic chemistry occurring in the interstellar medium. In this work, we have investigated the low-temperature radiation-induced transformations of a 1 : 1 CH4HCN complex as a plausible precursor of the simplest nitriles using the matrix isolation approach with FTIR spectroscopic detection. The parent complexes isolated in a noble gas (Ng) matrix were obtained by deposition of the CH4/HCN/Ng gaseous mixture and characterized by comparison of experimental complexation-induced shifts of the HCN fundamentals with the results of the ab initio calculations. It was found that the X-ray irradiation of low-temperature matrices containing the isolated 1 : 1 CH4HCN complex resulted in the formation of acetonitrile (CH3CN) and isoacetonitrile (CH3NC) and it appears to be the first experimental evidence for the formation of C2 nitriles (acetonitrile and isoacetonitrile) from such a "building block". Additionally, a 1 : 1 CH4HNC complex was tentatively assigned to the irradiated Ar and Kr matrices. It is demonstrated that the matrix has a strong effect on the CH3CN/CH3NC yield ratio, which dramatically increases in the row Ar < Kr < Xe. Also, the efficiency of the radiation-induced formation of the CH4HNC complex was shown to decrease from Ar to Kr. It is believed that the proposed pathway for acetonitrile formation may be a significant step in the radiation-induced evolution leading to complex organic molecules and biomolecules under astrochemical conditions. Furthermore, the obtained results provide a prominent example of the impact of very weak intermolecular interactions on the radiation-induced transformations in cold media.
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7
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Feldman VI, Ryazantsev SV, Kameneva SV. Matrix isolation in laboratory astrochemistry: state-of-the-art, implications and perspective. RUSSIAN CHEMICAL REVIEWS 2021. [DOI: 10.1070/rcr4995] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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8
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Bernhardt B, Ruth M, Reisenauer HP, Schreiner PR. Aminohydroxymethylene (H 2N-C̈-OH), the Simplest Aminooxycarbene. J Phys Chem A 2021; 125:7023-7028. [PMID: 34374543 DOI: 10.1021/acs.jpca.1c06151] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We generated and isolated hitherto unreported aminohydroxymethylene (1, aminohydroxycarbene) in solid Ar via pyrolysis of oxalic acid monoamide (2). Astrochemically relevant carbene 1 is persistent under cryogenic conditions and only decomposes to HNCO + H2 and NH3 + CO upon irradiation of the matrix at 254 nm. This photoreactivity is contrary to other hydroxycarbenes and aminomethylene, which undergo [1,2]H shifts to the corresponding carbonyls or imine. The experimental data are well supported by the results of CCSD(T)/cc-pVTZ and B3LYP/6-311++G(3df,3pd) computations.
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Affiliation(s)
- Bastian Bernhardt
- Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
| | - Marcel Ruth
- Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
| | - Hans Peter Reisenauer
- Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
| | - Peter R Schreiner
- Institute of Organic Chemistry, Justus Liebig University, Heinrich-Buff-Ring 17, 35392 Giessen, Germany
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9
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A matrix isolation and Ab initio study on C2H6…HCN complex: An unusual example of hydrogen bonding. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.129910] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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10
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11
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Darla N, Sharma D, Sitha S. Formation of Formamide from HCN + H 2O: A Computational Study on the Roles of a Second H 2O as a Catalyst, as a Spectator, and as a Reactant. J Phys Chem A 2019; 124:165-175. [PMID: 31820987 DOI: 10.1021/acs.jpca.9b09924] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Formamide (NH2CHO), being the smallest and fundamental building block of life (with a peptide linkage), has recently been able to attract much interests, in the field of astrochemistry, astrophysics, and astrobiology. In this work, using quantum mechanical computations, reactions between HCN and H2O, leading to the formation of formamide, have been analyzed. For the first time, an alternative and competing reaction channel, which proceeds via a geminal diol intermediate, for the formation of formamide, has been proposed. In this alternative channel, an extra water molecule (second H2O) was found to be acting as a reactant, in the second step of the reaction path. Effects of second H2O molecule in the reaction paths, providing catalytic assistance to the reaction or behaving like a spectator (concept is introduced for the first time for this reaction), have also been analyzed. Usefulness of spectator behavior is highlighted for the reactions happening on the rigid water-ice surfaces, where the water-ice may not be getting involved for any catalytic assistance. In light of catalytic assistances provided by the second H2O, prominent effects in reducing the barrier heights drastically (even for the second step of the reaction, the barrier height was found to be below the reactants), through a hydrogen relay transport mechanism, were observed. In addition to the mechanism studies, interstellar feasibilities of all the reaction channels and their significances are discussed in detail.
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Affiliation(s)
- Nagasuneetha Darla
- Department of Chemical Sciences , University of Johannesburg , P.O. Box 524, Auckland Park, Johannesburg , South Africa 2006
| | - Divya Sharma
- Department of Chemical Sciences , University of Johannesburg , P.O. Box 524, Auckland Park, Johannesburg , South Africa 2006
| | - Sanyasi Sitha
- Department of Chemical Sciences , University of Johannesburg , P.O. Box 524, Auckland Park, Johannesburg , South Africa 2006
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12
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13
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Kameneva SV, Tyurin DA, Feldman VI. Characterization of the HCNCO complex and its radiation-induced transformation to HNCCO in cold media: an experimental and theoretical investigation. Phys Chem Chem Phys 2018; 19:24348-24356. [PMID: 28849816 DOI: 10.1039/c7cp03518g] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The HCNCO complex and its X-ray induced transformation to HNCCO in solid noble gas (Ng) matrices (Ng = Ne, Ar, Kr, Xe) was first characterized by matrix isolation FTIR spectroscopy at 5 K. The HCNCO complex was obtained by deposition of HCN/CO/Ng gaseous mixtures. The assignment was based on extensive quantum chemical calculations at the CCSD(T) level of theory. The calculations predicted two computationally stable structures for HCNCO and three stable structures for HNCCO. However, only the most energetically favorable linear structures corresponding to the co-ordination between the H atom of HCN (HNC) and the C atom of CO have been found experimentally. The HCNCO complex demonstrates a considerable red shift of the H-C stretching vibrations (-24 to -38 cm-1, depending on the matrix) and a blue shift of the HCN bending vibrations (+29 to +32 cm-1) with respect to that of the HCN monomer, while the C[double bond, length as m-dash]O stretching mode is blue-shifted by 15 to 20 cm-1 as compared to the CO monomer. The HNCCO complex reveals a strong red shift of the H-N bending (-77 to -118 cm-1) and a strong blue shift of the HNC bending mode (ca. +100 cm-1) as compared to the HNC monomer, whereas the C[double bond, length as m-dash]O stretching is blue-shifted by 24 to 29 cm-1 with respect to that of the CO monomer. The interaction energies were determined to be 1.01 and 1.87 kcal mol-1 for HCNCO and HNCCO, respectively. It was found that the formation of complexes with CO had a remarkable effect on the radiation-induced transformations of HCN. While the dissociation of HCN to H and CN is suppressed in complexes, the isomerization of HCN to HNC is strongly catalyzed by the complexation with CO. The astrochemical implications of the results are discussed.
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Affiliation(s)
- Svetlana V Kameneva
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia.
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14
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Is Photolytic Production a Viable Source of HCN and HNC in Astrophysical Environments? A Laboratory-based Feasibility Study of Methyl Cyanoformate. ACTA ACUST UNITED AC 2017. [DOI: 10.3847/1538-4357/aa8ea7] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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15
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Wang P, Zhao N, Tang Y. Halogen Bonding in the Complexes of CH3I and CCl4 with Oxygen-Containing Halogen-Bond Acceptors. J Phys Chem A 2017; 121:5045-5055. [DOI: 10.1021/acs.jpca.7b04342] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Peiwen Wang
- Environment
Research Institute, Shandong University, Shanda South Road 27, 250100 Shandong, China
| | - Nan Zhao
- Environment
Research Institute, Shandong University, Shanda South Road 27, 250100 Shandong, China
| | - Yizhen Tang
- School
of Environmental and municipal engineering, Qingdao University of Technology, Fushun Road 11, 266033 Qingdao, China
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16
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Sánchez EQ, Dubernet ML. Theoretical study of HCN-water interaction: five dimensional potential energy surfaces. Phys Chem Chem Phys 2017; 19:6849-6860. [PMID: 28218316 DOI: 10.1039/c6cp07894j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new five-dimensional potential energy surface is calculated at the coupled-cluster CCSD(T) level of theory for the HCN-water system, treating both monomers as rigid rotors. The associated methodology, which combines extensive ab initio calculations of moderate accuracy (CCSD(T)/AVDZ) and a fitting procedure involving a much lower angular coverage with more accurate ab initio calculations (CCSD(T)/CBS), is described in detail. This methodology provides a time-saving approach to compute quantitatively accurate potential energy surfaces with reasonable computational effort. Our potential reproduces the main features reported in the literature, and will allow us to perform the first quantum and semi-classical simulations of the collisional dynamic on this system.
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Affiliation(s)
- Ernesto Quintas Sánchez
- LERMA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne University, UPMC Univ Paris 06, 5 Place Janssen, 92190 Meudon, France.
| | - Marie-Lise Dubernet
- LERMA, Observatoire de Paris, PSL Research University, CNRS, Sorbonne University, UPMC Univ Paris 06, 5 Place Janssen, 92190 Meudon, France.
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17
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Kameneva SV, Tyurin DA, Nuzhdin KB, Feldman VI. Matrix isolation andab initiostudy on HCN/CO2system and its radiation-induced transformations: Spectroscopic evidence for HCN⋯CO2andtrans-HCNH⋯CO2complexes. J Chem Phys 2016; 145:214309. [DOI: 10.1063/1.4969075] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Svetlana V. Kameneva
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Daniil A. Tyurin
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Kirill B. Nuzhdin
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Vladimir I. Feldman
- Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow, Russia
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18
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Zhu C, Tsuge M, Räsänen M, Khriachtchev L. Experimental and theoretical study of the HXeI⋯HCl and HXeI⋯HCCH complexes. J Chem Phys 2015; 142:144306. [DOI: 10.1063/1.4917167] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Cheng Zhu
- Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 Helsinki, Finland
| | - Masashi Tsuge
- Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 Helsinki, Finland
| | - Markku Räsänen
- Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 Helsinki, Finland
| | - Leonid Khriachtchev
- Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 Helsinki, Finland
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19
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Khriachtchev L. Matrix-isolation studies of noncovalent interactions: more sophisticated approaches. J Phys Chem A 2015; 119:2735-46. [PMID: 25679775 DOI: 10.1021/jp512005h] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Noncovalent interactions are crucial for many physical, chemical, and biological phenomena. Matrix isolation is a powerful method to study noncovalent interactions, including hydrogen-bonded species, and it has been extensively used in this field. However, there are difficult situations, such as in the case of species that are impossible to prepare in the gas phase. In this article, we describe some advanced approaches allowing studies of complexes that are problematic for the traditional methods. Photolysis of a suitable precursor in a matrix can lead to a large concentration of 1:1 complexes, which are otherwise very difficult to prepare (e.g., the H2O···O complex). Photolysis of species combined with annealing can lead to complexes of molecules with mobile atoms (e.g., the same H2O···O complex). Simultaneous photolysis of two species combined with annealing can produce complexes of radicals via reactions of the photogenerated complexes with mobile atoms (e.g., the H2O···HCO complex). Interaction of noble-gas (Ng) hydrides with other species is another topic (e.g., the N2···HArF complex) and very large blue shifts of the H-Ng stretching modes are normally observed for these systems. Complexes and dimers of the higher-energy conformer of formic acid have been prepared by using selective vibrational excitation of the ground-state conformer. The higher-energy conformer of formic acid can be efficiently stabilized in the complexes with strong hydrogen bonding. We also consider some problematic cases when the changes in the vibrational frequencies of the 1:1 complexes are very small (e.g., the phenol···Xe complex) and when the complex formation is prevented by strong solvation in the matrix (e.g., species in solid xenon).
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Affiliation(s)
- Leonid Khriachtchev
- Department of Chemistry, University of Helsinki, P.O. Box 55, FI-00014 Helsinki, Finland
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20
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Golec B, Mucha M, Sałdyka M, Barnes A, Mielke Z. Formaldoxime hydrogen bonded complexes with ammonia and hydrogen chloride. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 136 Pt A:68-75. [PMID: 24300376 DOI: 10.1016/j.saa.2013.11.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Revised: 10/30/2013] [Accepted: 11/05/2013] [Indexed: 06/02/2023]
Abstract
An infrared spectroscopic and MP2/6-311++G(2d,2p) study of hydrogen bonded complexes of formaldoxime with ammonia and hydrogen chloride trapped in solid argon matrices is reported. Both 1:1 and 1:2 complexes between formaldoxime and ammonia, hydrogen chloride have been identified in the CH2NOH/NH3/Ar, CH2NOH/HCl/Ar matrices, respectively, their structures were determined by comparison of the spectra with the results of calculations. In the 1:1 complexes present in the argon matrices the OH group of formaldoxime acts as a proton donor for ammonia and the nitrogen atom acts as a proton acceptor for hydrogen chloride. In the 1:2 complexes ammonia or hydrogen chloride dimers interact both with the OH group and the nitrogen atom of CH2NOH to form seven membered cyclic structures stabilized by three hydrogen bonds. The theoretical spectra generally agree well with the experimental ones, but they seriously underestimate the shift of the OH stretch for the 1:1 CH2NOH⋯NH3 complex.
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Affiliation(s)
- Barbara Golec
- Faculty of Chemistry, University of Wrocław, Joliot Curie 14, 50-383 Wrocław, Poland
| | - Małgorzata Mucha
- Faculty of Chemistry, University of Wrocław, Joliot Curie 14, 50-383 Wrocław, Poland
| | - Magdalena Sałdyka
- Faculty of Chemistry, University of Wrocław, Joliot Curie 14, 50-383 Wrocław, Poland
| | - Austin Barnes
- Materials & Physics Research Centre, University of Salford, Salford M5 4WT, United Kingdom.
| | - Zofia Mielke
- Faculty of Chemistry, University of Wrocław, Joliot Curie 14, 50-383 Wrocław, Poland.
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Ali OY, Jewer E, Fridgen TD. Infrared spectroscopic characterization of hydrogen-bonded propylene oxide − ethanol and propylene oxide − 2-fluoroethanol complexes isolated in solid neon matrices. CAN J CHEM 2013. [DOI: 10.1139/cjc-2013-0355] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The infrared absorption spectra of hydrogen-bonded complexes of propylene oxide with either ethanol or 2-fluoroethanol have been recorded in neon matrices. Mixtures of propylene oxide and ethanol or propylene oxide and 2-fluoroethanol vapors were mixed with an excess of neon gas and deposited onto a KBr substrate at 4.2 K. The results indicate that hydrogen-bonded complexes were formed with propylene oxide as the hydrogen bond acceptor and either ethanol or 2-fluoroethanol as the hydrogen bond donors. The features assigned to the O−H stretch were red-shifted by 175 and 193 cm−1 for the ethanol- and 2-fluoroethanol-containing complexes, respectively. The difference in red shifts can be accounted for due to the greater acidity of 2-fluroethanol. Deuterium isotope experiments were conducted to help confirm the assignment of the O–H stretch for the complexes. As well, structures and infrared spectra were calculated using B3LYP/6-311++G(2d,2p) calculations and were used to compare with the experimental spectra. A “scaling equation” rather than a scaling factor was used and is shown to greatly increase the utility of the calculations when comparing with experimental spectra. An examination of the O–H stretching red shifts for many hydrogen-bound complexes reveals a relationship between the shift and the difference between the acidity of the hydrogen bond donor and the basicity of the hydrogen bond acceptor (the enthalpy of proton transfer). Both hydrogen-bonded complexes and proton-bound complexes appear to have a maximum in the reduced frequency value that corresponds to complexes where the hydrogen/proton are equally shared between the two bases.
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Affiliation(s)
- Osama Y. Ali
- Department of Chemistry, Memorial University, St. John’s, NL A1B 3X7, Canada
| | - Elyse Jewer
- Department of Chemistry, Memorial University, St. John’s, NL A1B 3X7, Canada
| | - Travis D. Fridgen
- Department of Chemistry, Memorial University, St. John’s, NL A1B 3X7, Canada
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Cao Q, Berski S, Räsänen M, Latajka Z, Khriachtchev L. Spectroscopic and Computational Characterization of the HCO···H2O Complex. J Phys Chem A 2013; 117:4385-93. [DOI: 10.1021/jp4009477] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Qian Cao
- Department of Chemistry, P.O. Box 55, FIN-00014, University of Helsinki, Finland
| | - Slawomir Berski
- Faculty of Chemistry, University of Wroclaw, 14, F. Joliot-Curie Str., 50-383 Wroclaw, Poland
| | - Markku Räsänen
- Department of Chemistry, P.O. Box 55, FIN-00014, University of Helsinki, Finland
| | - Zdzislaw Latajka
- Faculty of Chemistry, University of Wroclaw, 14, F. Joliot-Curie Str., 50-383 Wroclaw, Poland
| | - Leonid Khriachtchev
- Department of Chemistry, P.O. Box 55, FIN-00014, University of Helsinki, Finland
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Cao Q, Andrijchenko N, Ahola AE, Domanskaya A, Räsänen M, Ermilov A, Nemukhin A, Khriachtchev L. Interaction of phenol with xenon and nitrogen: Spectroscopic and computational characterization. J Chem Phys 2012; 137:134305. [DOI: 10.1063/1.4754435] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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25
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Barnes AJ, Mielke Z. Matrix effects on hydrogen-bonded complexes trapped in low-temperature matrices. J Mol Struct 2012. [DOI: 10.1016/j.molstruc.2012.05.020] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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26
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Golec B, Mucha M, Mielke Z. Complexation of formaldoxime with water. Infrared matrix isolation and theoretical studies. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 86:461-466. [PMID: 22127136 DOI: 10.1016/j.saa.2011.10.069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2011] [Revised: 10/23/2011] [Accepted: 10/31/2011] [Indexed: 05/31/2023]
Abstract
The 1:1, 1:2 and 2:1 formaldoxime-water complexes isolated in the argon matrices have been studied by help of FTIR spectroscopy and MP2/6-311++G(2d,2p) method. The calculations predicted the stability of the three CH(2)NOH···H(2)O isomeric complexes, three CH(2)NOH···(H(2)O)(2) ones and one (CH(2)NOH)(2)···H(2)O complex. The analysis of the experimental spectra and their comparison with theoretical ones indicated that both the 1:1 and 1:2 complexes trapped in solid argon have the most stable cyclic structures stabilized by the O-H···O and O-H···N bonds between the formaldoxime and water molecules. In the 1:2 complex formaldoxime interacts with the water dimer, one H(2)O molecule acts as a proton acceptor for the OH group of formaldoxime whereas the second H(2)O molecule acts as a proton donor toward the nitrogen atom of the formaldoxime molecule. In the (CH(2)NOH)(2)···H(2)O complex the OH group of the water molecule acts as a proton donor toward one of the oxygen atoms of the formaldoxime cyclic dimer.
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Affiliation(s)
- Barbara Golec
- Faculty of Chemistry, University of Wrocław, Joliot-Curie 14, 50-383 Wrocław, Poland
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27
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Jing B, Li QZ, Gong BA, Liu ZB, Li WZ, Cheng JB, Sun JZ. The prominent enhancing effect and mechanism of the methyl group in the X···Y (X=O, S, H3CO, H3CS, (H3C)2O, (H3C)2S; Y=HCN, HNC) hydrogen-bonded complex. Mol Phys 2011. [DOI: 10.1080/00268976.2011.554899] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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28
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Nguyen VS, Abbott HL, Dawley MM, Orlando TM, Leszczynski J, Nguyen MT. Theoretical Study of Formamide Decomposition Pathways. J Phys Chem A 2011; 115:841-51. [DOI: 10.1021/jp109143j] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Vinh Son Nguyen
- Department of Chemistry, and LMCC-Mathematical Modeling and Computational Science Center, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium
| | - Heather L. Abbott
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
| | - M. Michele Dawley
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
| | - Thomas M. Orlando
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332-0400, United States
| | - Jerzy Leszczynski
- Interdisciplinary Center for Nanotoxicity, Department of Chemistry, Jackson State University, Jackson, Mississippi 39217-0510, United States
| | - Minh Tho Nguyen
- Department of Chemistry, and LMCC-Mathematical Modeling and Computational Science Center, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium
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29
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Jing B, Li Q, Gong B, Cheng J, Li W, Liu Z. A theoretical analysis of the weakly bound complexes HM ··· HXY (M=O and S; XY=CN and NC): comparison with H2M ··· HXY complexes. Mol Phys 2010. [DOI: 10.1080/00268976.2010.489518] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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30
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Djebra-Belmessaoud N, Nait Achour M, Berthier G, Savinelli R. A comparative theoretical study of the hydrogen bonding between cyanide or isocyanide hydrides and water. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.theochem.2009.11.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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31
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Ab initio MO Study of Hydrogen Bonding and Spectral Characteristics of HCN-H2O-HCN Trimer: Comparison between Dimer and Trimer. JOURNAL OF COMPUTER AIDED CHEMISTRY 2010. [DOI: 10.2751/jcac.11.36] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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32
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Li Q, An X, Cheng J, Gong B, Sun J. Ab initiostudy of the structure, cooperativity, and vibrational properties of HNC ternary complexes with two HF molecules. Mol Phys 2009. [DOI: 10.1080/00268970903025642] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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33
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Golec B, Bil A, Mielke Z. Photochemistry of Formaldoxime−Nitrous Acid Complexes in an Argon Matrix: Identification of Formaldoxime Nitrite. J Phys Chem A 2009; 113:9434-41. [DOI: 10.1021/jp9048428] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Barbara Golec
- Faculty of Chemistry, University of Wrocław, Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Andrzej Bil
- Faculty of Chemistry, University of Wrocław, Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Zofia Mielke
- Faculty of Chemistry, University of Wrocław, Joliot-Curie 14, 50-383 Wrocław, Poland
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Bossa J, Duvernay F, Theulé P, Borget F, Chiavassa T. VUV irradiation of carbon dioxide (CO2) and ammonia (NH3) complexes in argon matrix. Chem Phys 2008. [DOI: 10.1016/j.chemphys.2008.10.026] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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35
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36
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Khriachtchev L. Rotational isomers of small molecules in noble-gas solids: From monomers to hydrogen-bonded complexes. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2007.10.011] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Coupeaud A, Piétri N, Aycard JP, Couturier-Tamburelli I. Water/cyanobutadiyne complexes: an infrared matrix isolation and theoretical study. Phys Chem Chem Phys 2007; 9:3985-91. [PMID: 17646887 DOI: 10.1039/b703402d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The structures and energies of the 1:1 HC5N:H2O complexes in solid argon matrices have been investigated using FTIR spectroscopy and ab initio calculations, at the B3LYP/6-31G** and MP2/6-31G** levels of theory. Two types of 1:1 complexes are observed. The first one corresponds to the NH structure characterized by a hydrogen bond between H2O and the nitrogen of HC5N. The second corresponds to the OH form that involves a van der Waals interaction between the hydrogen of HC5N and the oxygen of water. HC5N can thus act either as an electrophile or as a nucleophile in complexes with water.
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Affiliation(s)
- Anne Coupeaud
- UMR CNRS 6633, Physique des Interactions Ioniques et Moléculaires, Equipe de Spectrométries et Dynamique Moléculaires, Université de Provence, Case 252, Centre de St-Jérôme, 13397, Marseille cedex 20, France
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39
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Douberly GE, Merritt JM, Miller RE. Infrared−Infrared Double Resonance Spectroscopy of the Isomers of Acetylene−HCN and Cyanoacetylene−HCN in Helium Nanodroplets. J Phys Chem A 2007; 111:7282-91. [PMID: 17465533 DOI: 10.1021/jp070015k] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Infrared-infrared double resonance spectroscopy is used to probe the vibrational dynamics of molecular complexes solvated in helium nanodroplets. We report results for the acetylene-HCN and cyanoacetylene-HCN binary complexes, each having two stable isomers. We find that vibrational excitation of an acetylene-HCN complex results in a population transfer to the other isomer. Photoinduced isomerization is found to be dependent on both the initially excited vibrational mode and the identity of the acetylene-HCN isomer. However, population transfer is not observed for the cyanoacetylene-HCN complexes. The results are rationalized in terms of the ab initio intermolecular potential energy surfaces for the two systems with particular emphasis on the long-range barriers to rearrangement.
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Affiliation(s)
- Gary E Douberly
- Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, USA.
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40
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Malaspina T, Fileti EE, Riveros JM, Canuto S. Ab Initio Study of the Isomeric Equilibrium of the HCN···H2O and H2O···HCN Hydrogen-Bonded Clusters. J Phys Chem A 2006; 110:10303-8. [PMID: 16928122 DOI: 10.1021/jp062780p] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An ab initio study of the stability, spectroscopic properties, and isomeric equilibrium of the hydrogen-bonded HCN...H2O and H2O...HCN isomers is presented. Density functional theory and perturbative second-order MP2 and coupled-cluster CCSD(T) calculations were carried out and binding energies obtained with correlation-consistent basis sets including extrapolation to the infinity basis set level. At the best theoretical level, CCSD(T), the H2O...HCN complex is more stable than the HCN...H2O complex by ca. 6.3 kJ mol(-1). Rotational and vibrational spectra, including anharmonic corrections, are calculated. These calculated spectroscopic data are used to obtain thermochemical contributions to the thermodynamic functions and hence the Gibbs free energy. The relative free energies are used to estimate the equilibrium constant for isomerism. We find that under typical conditions of supersonic expansion experiments (T < 150 K) H2O...HCN is essentially the only isomer present. Furthermore, our calculations indicate that the hydrogen-bonded cluster becomes favorable over the separated moieties at temperatures below 200 K.
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Affiliation(s)
- T Malaspina
- Instituto de Física, Universidade de São Paulo, CP 66318, 05315-970, São Paulo, SP, Brazil
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41
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Duvernay F, Trivella A, Borget F, Coussan S, Aycard JP, Chiavassa T. Matrix isolation Fourier transform infrared study of photodecomposition of formimidic acid. J Phys Chem A 2006; 109:11155-62. [PMID: 16331898 DOI: 10.1021/jp054903w] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The UV isomerization of formamide (HCONH2) trapped in xenon, nitrogen, argon, and neon cryogenic matrices has been monitored by Fourier transform infrared (FT-IR) spectroscopy. Formamide monomer is the only species present in the matrices after deposition; when UV-selective irradiation was carried out at 240 nm, the n --> pi transition allowed us to observe the formation of several isomers of formimidic acid [H(OH)C=NH]. On these latter species, we carried out selective IR irradiation of their OH stretching mode and compared the experimental and theoretical (B3LYP/6-311+G(2d,2p)) sets of bands. This study allowed us to characterize for the first time all the isomers of formimidic acid. We have then studied the vacuum UV photodecomposition (lambda > 160 nm) of this molecule at 10 K in argon and xenon matrices. Several primary photoproducts such as HCN.H2O, HNC.H2O, and HNCO.H2 complexes, yielded by dehydration and dehydrogenation processes, were characterized.
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Affiliation(s)
- Fabrice Duvernay
- Physique des Interactions Ioniques et Moléculaires, Unité mixte de recherche 6633, Université de Provence et Centre National de la Recherche Scientifique, Centre de St Jérôme, case 252, 13397 Marseille Cedex 20, France
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Muchová E, Spirko V, Hobza P, Nachtigallová D. Theoretical study of photoacidity of HCN: the effect of complexation with water. Phys Chem Chem Phys 2006; 8:4866-73. [PMID: 17066176 DOI: 10.1039/b610001e] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The character of the hydrogen bonding and the excited state proton transfer (ESPT) in the model system HCN...H(2)O is investigated. The PES of the two lowest excited states of the H(2)O...HCN complex was calculated using the CASPT2 method. The nonadiabatic coupling of the two states of the (pi-->pi*) and (pi-->sigma*) character is responsible for the excited state proton/hydrogen transfer. Compared to the ground state, the barrier for this process is significantly smaller. An increased number of water molecules in the complex with cyclic hydrogen-bonded network causes a large blue shift of the state of the (pi-->sigma*) character. The question of the dissociation of the complex in its excited state is also addressed.
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Affiliation(s)
- Eva Muchová
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic and Center for Biomolecules and Complex Molecular Systems, Flemingovo nam. 2, 166 10, Prague 6
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43
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Duvernay F, Chiavassa T, Borget F, Aycard JP. Vacuum Ultraviolet (VUV) Photodecomposition of Urea Isolated in Cryogenic Matrix: First Detection of Isourea. J Phys Chem A 2005; 109:6008-18. [PMID: 16833937 DOI: 10.1021/jp051913o] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Vacuum ultraviolet (VUV) irradiation at wavelengths of lambda > 160 nm of urea-h4 (NH2CONH2) and urea-d4 (ND2COND2) has been monitored by Fourier transform infrared spectroscopy in argon and xenon matrixes. Several primary photoproducts, such as HNCO:NH3 (isocyanic acid:ammonia), CO:N2H4 (carbon monoxide:hydrazine) molecular complexes, and isourea (H2N(OH)C=NH), which is reported for the first time, were characterized. The assignment of complexes was achieved by co-depositing the pairs of respective species, whereas the isourea identification was based on the comparison between the experimental and theoretical (B3LYP) infrared spectra. Isourea is found in the argon matrix in its most stable (s-Z)-(E) configuration. It is an intermediate in the VUV decomposition process; its dehydration leads to the NH2CN:H2O complex. In the xenon matrix, the photochemistry of urea yields the HNCO:NH3 complex as a major product, whereas the CO:N2H4 complex is observed in trace amounts. The observed differences between the argon and xenon matrixes suggest the crossing between S1 and T1 potential surfaces of urea to be responsible for the formation of the HNCO:NH3 complex. A comparison is also performed with other carboxamides, such as formamide (HCONH2) or acetamide (CH3CONH2).
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Affiliation(s)
- Fabrice Duvernay
- Physique des Interactions Ioniques et Moléculaires, UMR 6633, Université de Provence et CNRS, Centre de St Jérôme, case 252, 13397 Marseille Cedex 20, France
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44
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Coussan S, Roubin P, Perchard JP. Hydrogen Bonding in ROH:R‘OH (R, R‘ = H, CH3, C2H5) Heterodimers: Matrix-Dependent Structure and Infrared-Induced Isomerization. J Phys Chem A 2004. [DOI: 10.1021/jp048303t] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- S. Coussan
- Laboratoire PIIM, UMR 6633, Equipe SDM, Service 242, Université de Provence, CNRS, Centre Saint-Jérôme, 13397 Marseille Cedex 20, France, and Laboratoire de Dynamique, Interactions et Réactivité, CNRS UMR 7075, Université Pierre et Marie Curie, Bâtiment F 74, case courrier 49, 4 Place Jussieu, 75252 Paris Cedex 05, France
| | - P. Roubin
- Laboratoire PIIM, UMR 6633, Equipe SDM, Service 242, Université de Provence, CNRS, Centre Saint-Jérôme, 13397 Marseille Cedex 20, France, and Laboratoire de Dynamique, Interactions et Réactivité, CNRS UMR 7075, Université Pierre et Marie Curie, Bâtiment F 74, case courrier 49, 4 Place Jussieu, 75252 Paris Cedex 05, France
| | - J. P. Perchard
- Laboratoire PIIM, UMR 6633, Equipe SDM, Service 242, Université de Provence, CNRS, Centre Saint-Jérôme, 13397 Marseille Cedex 20, France, and Laboratoire de Dynamique, Interactions et Réactivité, CNRS UMR 7075, Université Pierre et Marie Curie, Bâtiment F 74, case courrier 49, 4 Place Jussieu, 75252 Paris Cedex 05, France
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45
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Maçôas EMS, Khriachtchev L, Fausto R, Räsänen M. Photochemistry and Vibrational Spectroscopy of the Trans and Cis Conformers of Acetic Acid in Solid Ar. J Phys Chem A 2004. [DOI: 10.1021/jp037840v] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- E. M. S. Maçôas
- Department of Chemistry, University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland, and Department of Chemistry (CQC), University of Coimbra, P-3004-535 Coimbra, Portugal
| | - L. Khriachtchev
- Department of Chemistry, University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland, and Department of Chemistry (CQC), University of Coimbra, P-3004-535 Coimbra, Portugal
| | - R. Fausto
- Department of Chemistry, University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland, and Department of Chemistry (CQC), University of Coimbra, P-3004-535 Coimbra, Portugal
| | - M. Räsänen
- Department of Chemistry, University of Helsinki, P.O. Box 55, FIN-00014 Helsinki, Finland, and Department of Chemistry (CQC), University of Coimbra, P-3004-535 Coimbra, Portugal
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46
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Rivelino R, Chaudhuri P, Canuto S. Quantifying multiple-body interaction terms in H-bonded HCN chains with many-body perturbation/coupled-cluster theories. J Chem Phys 2003. [DOI: 10.1063/1.1575195] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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47
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Gardebien F, Sevin A. Catalytic Model Reactions for the HCN Isomerization. I. Theoretical Characterization of Some Water-Catalyzed Mechanisms. J Phys Chem A 2003. [DOI: 10.1021/jp022238a] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fabrice Gardebien
- Laboratoire de Chimie Théorique, Université Paris VI,4, place Jussieu, case courrier 137, F-75252 Paris, France
| | - Alain Sevin
- Laboratoire de Chimie Théorique, Université Paris VI,4, place Jussieu, case courrier 137, F-75252 Paris, France
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48
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Gardebien F, Sevin A. Catalytic Model Reactions for the HCN Isomerization. II. Theoretical Investigation of an Anionic Pathway. J Phys Chem A 2003. [DOI: 10.1021/jp0222393] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Fabrice Gardebien
- Laboratoire de Chimie Théorique, Université Paris VI, 4, place Jussieu, case courrier 137, F-75252 Paris, France
| | - Alain Sevin
- Laboratoire de Chimie Théorique, Université Paris VI, 4, place Jussieu, case courrier 137, F-75252 Paris, France
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Sałdyka M, Mielke Z. Infrared Matrix Isolation Studies and Ab Initio Calculations of Formhydroxamic Acid. J Phys Chem A 2002. [DOI: 10.1021/jp013643p] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Magdalena Sałdyka
- Faculty of Chemistry, Wrocław University, Joliot-Curie 14, 50-383 Wrocław, Poland
| | - Zofia Mielke
- Faculty of Chemistry, Wrocław University, Joliot-Curie 14, 50-383 Wrocław, Poland
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