1
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Jin J, Wulf T, Jorewitz M, Heine T, Asmis KR. Vibrational spectroscopy of Cu +(H 2) 4: about anharmonicity and fluxionality. Phys Chem Chem Phys 2023; 25:5262-5270. [PMID: 36723211 DOI: 10.1039/d2cp05802b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The vibrational spectra of the copper(I) cation-dihydrogen complexes Cu+(H2)4, Cu+(D2)4 and Cu+(D2)3H2 are studied using cryogenic ion trap vibrational spectroscopy in combination with quantum chemical calculations. The infrared photodissociation (IRPD) spectra (2500-7300 cm-1) are assigned based on a comparison to IR spectra calculated using vibrational second-order perturbation theory (VPT2). The IRPD spectra exhibit ≈60 cm-1 broad bands that lack rotational resolution, indicative of rather floppy complexes even at an ion trap temperature of 10 K. The observed vibrational features are assigned to the excitations of dihydrogen stretching fundamentals, combination bands of these fundamentals with low energy excitations as well as overtone excitations of a minimum-energy structure with Cs symmetry. The three distinct dihydrogen positions present in the structure can interconvert via pseudorotations with energy barriers less than 10 cm-1, far below the zero-point vibrational energy. Ab initio Born-Oppenheimer molecular dynamics (BOMD) simulations confirm the fluxional behavior of these complexes and yield an upper limit for the timeframe of the pseudorotation on the order of 10 ps. For Cu+(D2)3H2, the H2 and D2 loss channels yield different IRPD spectra indicating non-ergodic behavior.
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Affiliation(s)
- Jiaye Jin
- Wilhelm-Ostwald-Institut für Physikalische und Theoretisch Chemie, Universität Leipzig, Linnéstr. 2, 04103, Leipzig, Germany.
| | - Toshiki Wulf
- Wilhelm-Ostwald-Institut für Physikalische und Theoretisch Chemie, Universität Leipzig, Linnéstr. 2, 04103, Leipzig, Germany. .,Institute of Resource Ecology, Research Site Leipzig, Helmholtz-Zentrum Dresden-Rossendorf, Permoserstr. 15, 04318, Leipzig, Germany.,Faculty of Chemistry and Food Chemistry, School of Science, TU Dresden, 01062, Dresden, Germany.
| | - Marcel Jorewitz
- Wilhelm-Ostwald-Institut für Physikalische und Theoretisch Chemie, Universität Leipzig, Linnéstr. 2, 04103, Leipzig, Germany.
| | - Thomas Heine
- Institute of Resource Ecology, Research Site Leipzig, Helmholtz-Zentrum Dresden-Rossendorf, Permoserstr. 15, 04318, Leipzig, Germany.,Faculty of Chemistry and Food Chemistry, School of Science, TU Dresden, 01062, Dresden, Germany.
| | - Knut R Asmis
- Wilhelm-Ostwald-Institut für Physikalische und Theoretisch Chemie, Universität Leipzig, Linnéstr. 2, 04103, Leipzig, Germany.
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2
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Zheng R, Shi L, Yang D, Tian Y, Yang W. A theoretical study of the intermolecular interactions of H 2-CuF complex: Intermolecular vibrations, isotope effects, and rotational structure. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 274:121134. [PMID: 35290942 DOI: 10.1016/j.saa.2022.121134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2021] [Revised: 03/05/2022] [Accepted: 03/07/2022] [Indexed: 06/14/2023]
Abstract
In this paper, a theoretical study has been made on the intermolecular interactions of the H2-CuF complex, including binding energy, intermolecular vibrations, isotope effects, and rotational structure. Based on different bond lengths of H2 and CuF monomers, three intermolecular potential energy surfaces (PESs) were constructed at the level of single and double excitation coupled-cluster method with a non-iterative perturbation treatment of triple excitations [CCSD(T)] with aug-cc-pVTZ basis set supplemented with bond functions. A global minimum on the PESs show that H2-CuF complex belongs to C2ν point group with a T-shaped structure. The obtained binding energy ranges from 8890 to 10050 cm-1, which increases as the increment of H-H bond length, but opposite case has been determined as the increment of Cu-F bond length. The accuracy of PESs was examined by the available data of 101-000 transition. The predicted rotational transition frequency obtained from bound state calculations can reproduce the experimental observation very well, and the predicted error is 0.1% based on the PES1 constructed with rH2 and rCuF fixed at 0.838 and 1.7409 Å. By analyzing the wave function of the bound state, the intermolecular vibrational modes were assigned unambiguously. Isotope effects were also studied and the largest error is also 0.1% compared with the available 101-000 transition data. A set of spectroscopic parameters were obtained for six isotopologues to determine rotational structure of H2-CuF complex. Upon the complex formation, the obtained structure parameters show that H-H bond length is elongated by 0.081 Å, while Cu-F value is shortened by 0.008 Å from the respective average bond lengths of free monomer.
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Affiliation(s)
- Rui Zheng
- School of Physics and Electronics, North China University of Water Resources and Electric Power, Zhengzhou 450011, China.
| | - Lipeng Shi
- School of Physics and Electronics, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
| | - Dapeng Yang
- School of Physics and Electronics, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
| | - Yanshan Tian
- School of Physics and Electronics, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
| | - Wenpeng Yang
- School of Physics and Electronics, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
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3
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Persaud RR, Fang Z, Zall CM, Appel AM, Dixon DA. Computational Study of Triphosphine-Ligated Cu(I) Catalysts for Hydrogenation of CO 2 to Formate. J Phys Chem A 2021; 125:6600-6610. [PMID: 34297558 DOI: 10.1021/acs.jpca.1c04050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The catalyzed hydrogenation of CO2 to formate via a triphosphine-ligated Cu(I) was studied computationally at the density functional theory level in the presence of a self-consistent reaction field. Of the four functionals benchmarked, M06 was generally in the best agreement with the available experimentally estimated values. Two bases, DBU and TBD, were studied in the context of two proposed mechanisms in the MeCN solvent. Activation of H2 was explored by using LCu(DBU)+ to form LCuH. Dissociation of a ligand arm results in higher barriers to form the key hydride complex, LCuH. The preferred mechanism passes through a transition state, where the H2 has one H atom interacting with the copper center and the other H atom interacting with the N atom of the base, similar to H2 insertion into a frustrated Lewis pair. There is no significant difference between the choice of a base, DBU or TBD, with respect to the proposed mechanisms. We propose that the experimentally observed differences between DBU and TBD reactivities for this mechanism are due to off-pathway changes.
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Affiliation(s)
- Rudradatt R Persaud
- Department of Chemistry and Biochemistry, The University of Alabama, Shelby Hall, Tuscaloosa, Alabama 35487-0336, United States
| | - Zongtang Fang
- Department of Chemistry and Biochemistry, The University of Alabama, Shelby Hall, Tuscaloosa, Alabama 35487-0336, United States
| | - Christopher M Zall
- Department of Chemistry, Sam Houston State University, 1003 Bowers Boulevard, Huntsville, Texas 77341, United States
| | - Aaron M Appel
- Pacific Northwest National Laboratory, P.O. Box 999, MS K2-57, Richland, Washington 99352, United States
| | - David A Dixon
- Department of Chemistry and Biochemistry, The University of Alabama, Shelby Hall, Tuscaloosa, Alabama 35487-0336, United States
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4
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Veccham SP, Head-Gordon M. Density Functionals for Hydrogen Storage: Defining the H2Bind275 Test Set with Ab Initio Benchmarks and Assessment of 55 Functionals. J Chem Theory Comput 2020; 16:4963-4982. [PMID: 32603109 DOI: 10.1021/acs.jctc.0c00292] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Efficient and high-capacity storage materials are indispensable for a hydrogen-based economy. In silico tools can accelerate the process of discovery of new adsorbent materials with optimal hydrogen adsorption enthalpies. Density functional theory is well-poised to become a very useful tool for enabling high-throughput screening of potential materials. In this work, we have identified density functional approximations that provide good performance for hydrogen binding applications following a two-pronged approach. First, we have compiled a data set (H2Bind275) that comprehensively represents the hydrogen binding problem capturing the chemical and mechanistic diversity in the binding sites encountered in hydrogen storage materials. We have also computed reference interaction energies for this data set using coupled-cluster theory. Second, we have assessed the performance of 55 density functional approximations for predicting H2 interaction energies and have identified two hybrid density functionals (ωB97X-V and ωB97M-V), two double hybrid density functionals (DSD-PBEPBE-D3(BJ) and PBE0-DH), and one semilocal density functional (B97M-V) as the best performing ones. We have recommended the addition of empirical dispersion corrections to systematically underbinding density functionals such as revPBE, BLYP, and B3LYP for improvements in performance at negligible additional cost. We have also recommended the usage of the def2-TZVPP basis set as it represents a good compromise between accuracy and cost, limiting the finite basis set errors to less than 1 kJ/mol.
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Affiliation(s)
- Srimukh Prasad Veccham
- Department of Chemistry, University of California, Berkeley, California 94720, United States.,Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Martin Head-Gordon
- Department of Chemistry, University of California, Berkeley, California 94720, United States.,Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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5
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Theoretical Insights into the Aerobic Hydrogenase Activity of Molybdenum–Copper CO Dehydrogenase. INORGANICS 2019. [DOI: 10.3390/inorganics7110135] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The Mo/Cu-dependent CO dehydrogenase from O. carboxydovorans is an enzyme that is able to catalyse CO oxidation to CO 2 ; moreover, it also expresses hydrogenase activity, as it is able to oxidize H 2 . Here, we have studied the dihydrogen oxidation catalysis by this enzyme using QM/MM calculations. Our results indicate that the equatorial oxo ligand of Mo is the best suited base for catalysis. Moreover, extraction of the first proton from H 2 by means of this basic centre leads to the formation of a Mo–OH–Cu I H hydride that allows for the stabilization of the copper hydride, otherwise known to be very unstable. In light of our results, two mechanisms for the hydrogenase activity of the enzyme are proposed. The first reactive channel depends on protonation of the sulphur atom of a Cu-bound cysteine residues, which appears to favour the binding and activation of the substrate. The second reactive channel involves a frustrated Lewis pair, formed by the equatorial oxo group bound to Mo and by the copper centre. In this case, no binding of the hydrogen molecule to the Cu center is observed but once H 2 enters into the active site, it can be split following a low-energy path.
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6
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Zheng R, Zheng L, Yang M. Investigating the influence of intramolecular bond lengths on the intermolecular interaction of H 2-AgCl complex: Binding energy, intermolecular vibrations, and isotope effects. J Chem Phys 2019; 150:164301. [PMID: 31042886 DOI: 10.1063/1.5085751] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In this paper, we performed a theoretical study on the influence of intramolecular bond lengths on the intermolecular interactions between H2 and AgCl molecules. Using four sets of bond lengths for the monomers of H2 and AgCl, four-dimensional intermolecular potential energy surfaces (PESs) were constructed from ab initio data points at the level of single and double excitation coupled cluster method with noniterative perturbation treatment of triple excitations. A T-shaped global minimum was found on the PES. Interestingly, both the binding energies and Ag-H2 distances present a linear relationship with the intramolecular bond lengths of H2-AgCl. The accuracy of these PESs was validated by the available spectroscopic data via the bound state calculations, and the predicted rotational transition frequencies can reproduce the experimental observations with a root-mean-squared error of 0.0003 cm-1 based on the PES constructed with r(H-H) and r(Ag-Cl) fixed at 0.795 and 2.261 Å, respectively. The intermolecular vibrational modes were assigned unambiguously with a simple pattern by analyzing the wave functions. Isotope effects were also investigated by the theoretical calculations, and the results are in excellent agreement with the available spectroscopic data. The transition frequencies for the isotopolog D2-AgCl are predicted with the accuracy of 0.3 MHz.
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Affiliation(s)
- Rui Zheng
- School of Mathematics and Information Science, North China University of Water Resources and Electric Power, Zhengzhou 450011, China
| | - Limin Zheng
- Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, People's Republic of China
| | - Minghui Yang
- Key Laboratory of Magnetic Resonance in Biological Systems, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Center for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, People's Republic of China
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7
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Obenchain DA, Frank DS, Grubbs GS, Pickett HM, Novick SE. The covalent interaction between dihydrogen and gold: A rotational spectroscopic study of H 2-AuCl. J Chem Phys 2017; 146:204302. [PMID: 28571327 PMCID: PMC5648549 DOI: 10.1063/1.4983042] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Accepted: 04/24/2017] [Indexed: 11/14/2022] Open
Abstract
The pure rotational transitions of H2-AuCl have been measured using a pulsed-jet cavity Fourier transform microwave spectrometer equipped with a laser ablation source. The structure was found to be T-shaped, with the H-H bond interacting with the gold atom. Both 35Cl and 37Cl isotopologues have been measured for both ortho and para states of H2. Rotational constants, quartic centrifugal distortion constants, and nuclear quadrupole coupling constants for gold and chlorine have been determined. The use of the nuclear spin-nuclear spin interaction terms Daa, Dbb, and Dcc for H2 were required to fit the ortho state of hydrogen, as well as a nuclear-spin rotation constant Caa. The values of the nuclear quadrupole coupling constant of gold are χaa=-817.9929(35) MHz, χbb=504.0(27) MHz, and χcc=314.0(27). This is large compared to the eQq of AuCl, 9.63 312(13) MHz, which indicates a strong, covalent interaction between gold and dihydrogen.
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Affiliation(s)
- Daniel A Obenchain
- Department of Chemistry, Hall-Atwater Laboratories, Wesleyan University, 52 Lawn Ave., Middletown, Connecticut 06459, USA
| | - Derek S Frank
- Department of Chemistry, Hall-Atwater Laboratories, Wesleyan University, 52 Lawn Ave., Middletown, Connecticut 06459, USA
| | - G S Grubbs
- Department of Chemistry, Missouri University of Science and Technology, 400 W. 11th Street, Rolla, Missouri 65409, USA
| | - Herbert M Pickett
- Department of Chemistry, Hall-Atwater Laboratories, Wesleyan University, 52 Lawn Ave., Middletown, Connecticut 06459, USA
| | - Stewart E Novick
- Department of Chemistry, Hall-Atwater Laboratories, Wesleyan University, 52 Lawn Ave., Middletown, Connecticut 06459, USA
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8
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Vollmer MV, Xie J, Lu CC. Stable Dihydrogen Complexes of Cobalt(−I) Suggest an Inverse trans-Influence of Lewis Acidic Group 13 Metalloligands. J Am Chem Soc 2017; 139:6570-6573. [DOI: 10.1021/jacs.7b02870] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Matthew V. Vollmer
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Jing Xie
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
| | - Connie C. Lu
- Department of Chemistry, University of Minnesota, 207 Pleasant Street SE, Minneapolis, Minnesota 55455, United States
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9
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Affiliation(s)
- Robert H. Crabtree
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, Connecticut 06520-8107, United States
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10
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Zhang X, Ganteför G, Alexandrova AN, Bowen K. Photoelectron spectroscopic and computational study of the PtMgH3,5− cluster anions. Phys Chem Chem Phys 2016; 18:19345-9. [DOI: 10.1039/c6cp03243e] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The two cluster anions, PtMgH3− and PtMgH5−, were studied by photoelectron spectroscopy and theoretical calculations.
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Affiliation(s)
- Xinxing Zhang
- Department of Chemistry
- Johns Hopkins University
- Baltimore
- USA
| | - Gerd Ganteför
- Department of Chemistry
- Johns Hopkins University
- Baltimore
- USA
| | - Anastassia N. Alexandrova
- Department of Chemistry and Biochemistry
- University of California, Los Angeles
- Los Angeles
- USA
- California NanoSystems Institute
| | - Kit Bowen
- Department of Chemistry
- Johns Hopkins University
- Baltimore
- USA
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11
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Bittner DM, Stephens SL, Zaleski DP, Tew DP, Walker NR, Legon AC. Gas phase complexes of H3N⋯CuF and H3N⋯CuI studied by rotational spectroscopy and ab initio calculations: the effect of X (X = F, Cl, Br, I) in OC⋯CuX and H3N⋯CuX. Phys Chem Chem Phys 2016; 18:13638-45. [DOI: 10.1039/c6cp01368f] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Complexes of H3N⋯CuF and H3N⋯CuI have been synthesised in the gas phase and characterized by microwave spectroscopy.
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Affiliation(s)
- Dror M. Bittner
- School of Chemistry
- Bedson Building
- Newcastle University
- Newcastle upon Tyne
- UK
| | | | - Daniel P. Zaleski
- School of Chemistry
- Bedson Building
- Newcastle University
- Newcastle upon Tyne
- UK
| | - David P. Tew
- School of Chemistry
- University of Bristol
- Bristol
- UK
| | - Nicholas R. Walker
- School of Chemistry
- Bedson Building
- Newcastle University
- Newcastle upon Tyne
- UK
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12
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Zaleski DP, Mullaney JC, Bittner DM, Tew DP, Walker NR, Legon AC. Interaction of a pseudo-π C—C bond with cuprous and argentous chlorides: Cyclopropane⋯CuCl and cyclopropane⋯AgCl investigated by rotational spectroscopy and ab initio calculations. J Chem Phys 2015; 143:164314. [DOI: 10.1063/1.4934539] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Daniel P. Zaleski
- School of Chemistry, Newcastle University, Bedson Building, Newcastle-Upon-Tyne NE1 7RU, United Kingdom
| | - John C. Mullaney
- School of Chemistry, Newcastle University, Bedson Building, Newcastle-Upon-Tyne NE1 7RU, United Kingdom
| | - Dror M. Bittner
- School of Chemistry, Newcastle University, Bedson Building, Newcastle-Upon-Tyne NE1 7RU, United Kingdom
| | - David P. Tew
- School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
| | - Nicholas R. Walker
- School of Chemistry, Newcastle University, Bedson Building, Newcastle-Upon-Tyne NE1 7RU, United Kingdom
| | - Anthony C. Legon
- School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
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13
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Grubbs GS, Obenchain DA, Frank DS, Novick SE, Cooke SA, Serrato A, Lin W. A Study of the Monohydrate and Dihydrate Complexes of Perfluoropropionic Acid Using Chirped-Pulse Fourier Transform Microwave (CP-FTMW) Spectroscopy. J Phys Chem A 2015; 119:10475-80. [PMID: 26421936 DOI: 10.1021/acs.jpca.5b08347] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This work reports the first known spectroscopic observation of the monohydrate and dihydrate complexes of perfluoropropionic acid (PFPA). The spectra have been observed using a chirped-pulse Fourier transform microwave (CP-FTMW) spectrometer in the 7750 to 14,250 MHz region. The structures of the species have been confirmed with the aid of ab initio quantum chemical calculations. Rotational constants A, B, and C have been determined and reported for both species along with centrifugal distortion constants ΔJ, ΔJK, ΔK, δJ, δK for H2O-PFPA and ΔJ, ΔJK, and δJ for (H2O)2-PFPA. Effects due to large amplitude motions were not observable in these experiments. Structures of the complexes have been determined using a combination of experimental second moment values and ab initio results. The complexation of the -OH of one or two water molecules has been found to occur in the plane of the carboxylic acid group forming a six- or eight-member ring.
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Affiliation(s)
- G S Grubbs
- Department of Chemistry, Missouri University of Science and Technology , 400 W. 11th Street, Rolla, Missouri 65401, United States
| | - Daniel A Obenchain
- Department of Chemistry, Wesleyan University , 52 Lawn Avenue, Middletown, Connecticut 06459, United States
| | - Derek S Frank
- Department of Chemistry, Wesleyan University , 52 Lawn Avenue, Middletown, Connecticut 06459, United States
| | - Stewart E Novick
- Department of Chemistry, Wesleyan University , 52 Lawn Avenue, Middletown, Connecticut 06459, United States
| | - S A Cooke
- Department of Chemistry, Wesleyan University , 52 Lawn Avenue, Middletown, Connecticut 06459, United States.,School of Natural and Social Sciences, State University of New York-Purchase College , 735 Anderson Hill Road, Purchase, New York 10577, United States
| | - Agapito Serrato
- Department of Chemistry, University of Texas Rio Grande Valley , Brownsville, Texas 78520, United States
| | - Wei Lin
- Department of Chemistry, University of Texas Rio Grande Valley , Brownsville, Texas 78520, United States
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14
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Robinson PJ, Ganteför G, Alexandrova A, Bowen KH. Photoelectron spectroscopic and theoretical study of the [HPd(η2-H2)]− cluster anion. J Chem Phys 2015; 143:094307. [DOI: 10.1063/1.4929998] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Affiliation(s)
- Paul J. Robinson
- Departments of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095-1569, USA
| | - Gerd Ganteför
- Departments of Chemistry and Materials Science, Johns Hopkins University, Baltimore, Maryland 21218, USA
| | - Anastassia Alexandrova
- Departments of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095-1569, USA
- California NanoSystems Institute, 570 Westwood Plaza, Building 114, Los Angeles, California 90095, USA
| | - Kit H. Bowen
- Departments of Chemistry and Materials Science, Johns Hopkins University, Baltimore, Maryland 21218, USA
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15
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Bittner DM, Zaleski DP, Stephens SL, Tew DP, Walker NR, Legon AC. A monomeric complex of ammonia and cuprous chloride: H3N⋯CuCl isolated and characterised by rotational spectroscopy and ab initio calculations. J Chem Phys 2015; 142:144302. [DOI: 10.1063/1.4916391] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Affiliation(s)
- Dror M. Bittner
- School of Chemistry, Newcastle University, Bedson Building, Newcastle upon Tyne, Tyne and Wear NE1 7RU, United Kingdom
| | - Daniel P. Zaleski
- School of Chemistry, Newcastle University, Bedson Building, Newcastle upon Tyne, Tyne and Wear NE1 7RU, United Kingdom
| | - Susanna L. Stephens
- School of Chemistry, Newcastle University, Bedson Building, Newcastle upon Tyne, Tyne and Wear NE1 7RU, United Kingdom
| | - David P. Tew
- School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
| | - Nicholas R. Walker
- School of Chemistry, Newcastle University, Bedson Building, Newcastle upon Tyne, Tyne and Wear NE1 7RU, United Kingdom
| | - Anthony C. Legon
- School of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
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16
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Grubbs GS, Obenchain DA, Pickett HM, Novick SE. H2—AgCl: A spectroscopic study of a dihydrogen complex. J Chem Phys 2014; 141:114306. [DOI: 10.1063/1.4895904] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- G. S. Grubbs
- Department of Chemistry, Missouri University of Science and Technology, 400 W. 11th St., Rolla, Missouri 65409, USA
| | - Daniel A. Obenchain
- Department of Chemistry, Wesleyan University, 52 Lawn Avenue, Middletown, Connecticut 06459-0180, USA
| | - Herbert M. Pickett
- Department of Chemistry, Wesleyan University, 52 Lawn Avenue, Middletown, Connecticut 06459-0180, USA
| | - Stewart E. Novick
- Department of Chemistry, Wesleyan University, 52 Lawn Avenue, Middletown, Connecticut 06459-0180, USA
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17
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Stephens SL, Bittner DM, Mikhailov VA, Mizukami W, Tew DP, Walker NR, Legon AC. Changes in the geometries of C₂H₂ and C₂H₄ on coordination to CuCl revealed by broadband rotational spectroscopy and ab-initio calculations. Inorg Chem 2014; 53:10722-30. [PMID: 25233123 DOI: 10.1021/ic501899c] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The molecular geometries of isolated complexes in which a single molecule of C2H4 or C2H2 is bound to CuCl have been determined through pure rotational spectroscopy and ab-initio calculations. The C2H2···CuCl and C2H4···CuCl complexes are generated through laser vaporization of a copper rod in the presence of a gas sample undergoing supersonic expansion and containing C2H2 (or C2H4), CCl4, and Ar. Results are presented for five isotopologues of C2H2···CuCl and six isotopologues of C2H4···CuCl. Both of these complexes adopt C(2v), T-shaped geometries in which the hydrocarbon binds to the copper atom through its π electrons such that the metal is equidistant from all H atoms. The linear and planar geometries of free C2H2 and C2H4, respectively, are observed to distort significantly on attachment to the CuCl unit, and the various changes are quantified. The ∠(*-C-H) parameter in C2H2 (where * indicates the midpoint of the C≡C bond) is measured to be 192.4(7)° in the r0 geometry of the complex representing a significant change from the linear geometry of the free molecule. This distortion of the linear geometry of C2H2 involves the hydrogen atoms moving away from the copper atom within the complex. Ab-initio calculations at the CCSD(T)(F12*)/AVTZ level predict a dihedral ∠(HCCCu) angle of 96.05° in C2H4···CuCl, and the experimental results are consistent with such a distortion from planarity. The bonds connecting the carbon atoms within each of C2H2 and C2H4, respectively, extend by 0.027 and 0.029 Å relative to the bond lengths in the isolated molecules. Force constants, k(σ), and nuclear quadrupole coupling constants, χ(aa)(Cu), [χ(bb)(Cu) - χ(cc)(Cu)], χ(aa)(Cl), and [χ(bb)(Cl) - χ(cc)(Cl)], are independently determined for all isotopologues of C2H2···CuCl studied and for four isotopologues of C2H4···CuCl.
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Affiliation(s)
- Susanna L Stephens
- School of Chemistry, Bedson Building, Newcastle University , Newcastle upon Tyne, Tyne and Wear NE1 7RU, United Kingdom
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The aerobic CO dehydrogenase from Oligotropha carboxidovorans. J Biol Inorg Chem 2014; 20:243-51. [PMID: 25156151 DOI: 10.1007/s00775-014-1188-4] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Accepted: 08/13/2014] [Indexed: 10/24/2022]
Abstract
We review here the recent literature dealing with the molybdenum- and copper-dependent CO dehydrogenase, with particular emphasis on the structure of the enzyme and recent advances in our understanding of the reaction mechanism of the enzyme.
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Stephens SL, Zaleski DP, Mizukami W, Tew DP, Walker NR, Legon AC. Distortion of ethyne on coordination to silver acetylide, C2H2⋅⋅⋅AgCCH, characterised by broadband rotational spectroscopy and ab initio calculations. J Chem Phys 2014; 140:124310. [DOI: 10.1063/1.4868035] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Wilcoxen J, Hille R. The hydrogenase activity of the molybdenum/copper-containing carbon monoxide dehydrogenase of Oligotropha carboxidovorans. J Biol Chem 2013; 288:36052-60. [PMID: 24165123 DOI: 10.1074/jbc.m113.522441] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The reaction of the air-tolerant CO dehydrogenase from Oligotropha carboxidovorans with H2 has been examined. Like the Ni-Fe CO dehydrogenase, the enzyme can be reduced by H2 with a limiting rate constant of 5.3 s(-1) and a dissociation constant Kd of 525 μM; both kred and kred/Kd, reflecting the breakdown of the Michaelis complex and the reaction of free enzyme with free substrate in the low [S] regime, respectively, are largely pH-independent. During the reaction with H2, a new EPR signal arising from the Mo/Cu-containing active site of the enzyme is observed which is distinct from the signal seen when the enzyme is reduced by CO, with greater g anisotropy and larger hyperfine coupling to the active site (63,65)Cu. The signal also exhibits hyperfine coupling to at least two solvent-exchangeable protons of bound substrate that are rapidly exchanged with solvent. Proton coupling is also evident in the EPR signal seen with the dithionite-reduced native enzyme, and this coupling is lost in the presence of bicarbonate. We attribute the coupled protons in the dithionite-reduced enzyme to coordinated water at the copper site in the native enzyme and conclude that bicarbonate is able to displace this water from the copper coordination sphere. On the basis of our results, a mechanism for H2 oxidation is proposed which involves initial binding of H2 to the copper of the binuclear center, displacing the bound water, followed by sequential deprotonation through a copper-hydride intermediate to reduce the binuclear center.
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Affiliation(s)
- Jarett Wilcoxen
- From the Department of Biochemistry, University of California, Riverside, California 92521
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