1
|
Xie F, Sun W, Pinacho P, Schnell M. CO 2 Aggregation on Monoethanolamine: Observations from Rotational Spectroscopy. Angew Chem Int Ed Engl 2023; 62:e202218539. [PMID: 36719030 DOI: 10.1002/anie.202218539] [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: 12/15/2022] [Revised: 01/26/2023] [Accepted: 01/30/2023] [Indexed: 02/01/2023]
Abstract
The initial stages of the gas-phase nucleation between CO2 and monoethanolamine were investigated via broadband rotational spectroscopy with the aid of extensive theoretical structure sampling. Sub-nanometer-scale aggregation patterns of monoethanolamine-(CO2 )n , n=1-4, were identified. An interesting competition between the monoethanolamine intramolecular hydrogen bond and the intermolecular interactions between monoethanolamine and CO2 upon cluster growth was discovered, revealing an intriguing CO2 binding priority to the hydroxyl group over the amine group. These findings are in sharp contrast to the general results for aqueous solutions. In the quinary complex, a cap-like CO2 tetramer was observed cooperatively surrounding the monoethanolamine. As the cluster approaches the critical size of new particle formation, the contribution of CO2 self-assembly to the overall stability increases.
Collapse
Affiliation(s)
- Fan Xie
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany
| | - Wenhao Sun
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany
| | - Pablo Pinacho
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany
| | - Melanie Schnell
- Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607, Hamburg, Germany.,Institut für Physikalische Chemie, Christian-Albrechts-Universität zu Kiel, Max-Eyth-Str. 1, 24118, Kiel, Germany
| |
Collapse
|
2
|
Yang Y, Sun X, Reza Poopari M, Jian C, Zeng H, Tang T, Xu Y. Chirality Discrimination at Binary Organic|Water Interfaces Monitored by Interfacial Tension Measurements with Preliminary Comparison with Molecular Dynamics Simulations. Chemphyschem 2023; 24:e202200608. [PMID: 36173980 DOI: 10.1002/cphc.202200608] [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: 08/15/2022] [Revised: 09/17/2022] [Indexed: 02/03/2023]
Abstract
Chirality discrimination at a binary toluene (organic)/water(aqueous) interface between R- or S-Tol-BINAP (2,2'-Bis(di-p-tolylphosphino)-1,1'-binaphthyl) molecules and the water-soluble serine chiral specie is examined for the first time, using a combination of interfacial tension measurements and molecular dynamic simulations. Experimental interfacial measurements exhibit a clear chirality-controlled difference when a homochiral versus a heterochiral enantiomeric pairs are introduced at the interfaces. The related molecular dynamics simulations support the experimental results and provide further molecular insight of intermolecular interactions at the interfaces. The results indicate that interfacial tension measurements can capture the preferential interactions which exist between different pairs of enantiomers at the binary interfaces, opening up a new way for probing chirality discrimination at liquid-liquid interfaces.
Collapse
Affiliation(s)
- Yanqing Yang
- Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada
| | - Xiaoyu Sun
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | | | - Cuiying Jian
- Department of Mechanical Engineering, York University, Toronto, Ontario, M3 J 1P3, Canada
| | - Hongbo Zeng
- Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Tian Tang
- Department of Mechanical Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Yunjie Xu
- Department of Chemistry, University of Alberta, Edmonton, Alberta, T6G 2G2, Canada
| |
Collapse
|
3
|
Insausti A, Ma J, Yang Q, Xie F, Xu Y. Rotational Spectroscopy of 2-Furoic Acid and Its Dimer: Conformational Distribution and Double Proton Tunneling. Chemphyschem 2022; 23:e202200176. [PMID: 35390214 DOI: 10.1002/cphc.202200176] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Revised: 04/06/2022] [Indexed: 01/18/2023]
Abstract
Structural and tunneling properties of the 2-furoic acid (FA) monomer and dimer were investigated using rotational spectroscopy and DFT calculations. CREST, a conformational ensemble space exploration tool, was used to identify all possible low energy conformations of the FA monomer and dimer, followed by the DFT geometry optimization and harmonic frequency calculations. Broadband rotational spectra in the 2-6 GHz and in the 8-12 GHz regions were recorded in a supersonic jet expansion. The monomeric FA was found to exist dominantly as three different conformers: I , II , and III in a jet, with I and II taking on the trans -COOH configuration while III having the cis -COOH configuration. For the FA dimer, only the I - II conformer was observed experimentally, whereas the symmetric I - I and II - II conformers were not observed because of their zero dipole moments. The analysis of the splittings in the rotational transitions of I - II allowed one to extract the tunneling splitting to be 1056.0(12) MHz. The barrier height was determined to be ~442 cm -1 using the scaled potential energy scans at several different levels of theory.
Collapse
Affiliation(s)
- Aran Insausti
- UPV/EHU: Universidad del Pais Vasco, Departamento de Química Física, SPAIN
| | - Jiarui Ma
- University of Alberta Department of Renewable Resources, Chemistry, CANADA
| | - Qian Yang
- University of Alberta, Chemistry, CANADA
| | - Fan Xie
- DESY Accelerator Centre: Deutsches Elektronen-Synchrotron, Spectroscopy of molecular processes, GERMANY
| | - Yunjie Xu
- University of Alberta Faculty of Science, Chemistry Department, 11227 Saskatchewan Drive, T6G 2G2, Edmonton, CANADA
| |
Collapse
|
4
|
Yang Y, Cheramy J, Brehm M, Xu Y. Raman Optical Activity of N-Acetyl-L-Cysteine in water and in methanol: the "clusters-in-a-liquid" model and ab initio molecular dynamics simulations. Chemphyschem 2022; 23:e202200161. [PMID: 35353934 DOI: 10.1002/cphc.202200161] [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: 03/09/2022] [Revised: 03/29/2022] [Indexed: 11/06/2022]
Abstract
Raman and Raman Optical Activity (ROA) spectra of N-acetyl-L-cysteine (NALC), a flexible chiral molecule, were measured in water and in methanol to evaluate the solvent effects. Two different solvation approaches, i.e. the DFT based clusters-in-a-liquid solvent model and the ab initio molecular dynamics (AIMD) simulations, were applied to simulate the Raman and ROA spectra. Systematic conformational searches were carried out using a recently developed conformational searching tool, CREST, with the inclusion of polarizable continuum model of water and of methanol. The CREST candidates of NALC and the NALC-solvent complexes were re-optimized and their Raman and ROA simulations were done at the B3LYP-D3BJ/def2-TZVP and the B3LYP-aug-cc-pVDZ//cc-pVTZ levels. Also, AIMD simulations , which includes some anharmonic effects and all intermolecular interactions in solution, were performed. By empirically weighting the computed Raman and ROA spectra of each conformer, good agreements with the experimental data were achieved with both approaches, while AIMD offered some improvements in the carbonyl and in the low wavenumber regions over the static DFT approach. The pros and cons of these two different approaches for accounting the solvent effects on Raman and ROA of this flexible chiral system will also be discussed.
Collapse
Affiliation(s)
| | | | - Martin Brehm
- Martin-Luther-Universität Halle-Wittenberg: Martin-Luther-Universitat Halle-Wittenberg, Chemistry, GERMANY
| | - Yunjie Xu
- University of Alberta Faculty of Science, Chemistry Department, 11227 Saskatchewan Drive, T6G 2G2, Edmonton, CANADA
| |
Collapse
|
5
|
Yang Y, Cheramy J, Xu Y. Matrix Isolation-Vibrational Circular Dichroism Spectroscopic Study of Conformations and Non-Covalent Interactions of Tetrahydro-2-Furoic Acid. Chemphyschem 2021; 22:1336-1343. [PMID: 33945674 DOI: 10.1002/cphc.202100256] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 05/01/2021] [Indexed: 11/10/2022]
Abstract
The conformational landscape and aggregation behaviour of tetrahydro-2-furoic acid (THFA) were investigated by using matrix isolation-vibrational circular dichroism (MI-VCD). The well-resolved experimental MI-IR and MI-VCD features in an argon matrix at 10 K allow one to identify two dominant monomeric conformations as trans-THFA where the hydroxyl and carbonyl groups of COOH are at opposite sides, as well as one cis-conformer. At 24 K and 30 K deposition temperatures, the experimental IR and VCD spectral features reveal further growth of the binary THFA aggregates. Systematic conformational searches identified three vastly different binary binding topologies, resulting in a few hundred stable (THFA)2 conformers. Interestingly, the main binary structures observed correspond to an unusual type of structure which is made of two trans-THFA subunits, in contrast to the usual double H-bonded ring binary structures, identified in a previous solution study. The present work showcases the power of MI-VCD spectroscopy in revealing unusual structures formed in a cold rare gas matrix.
Collapse
Affiliation(s)
- Yanqing Yang
- Chemistry Department, University of Alberta Edmonton, Alberta, Canada, T6G 2G2
| | - Joseph Cheramy
- Chemistry Department, University of Alberta Edmonton, Alberta, Canada, T6G 2G2
| | - Yunjie Xu
- Chemistry Department, University of Alberta Edmonton, Alberta, Canada, T6G 2G2
| |
Collapse
|
6
|
Li W, Quesada-Moreno MM, Pinacho P, Schnell M. Unlocking the Water Trimer Loop: Isotopic Study of Benzophenone-(H 2 O) 1-3 Clusters with Rotational Spectroscopy. Angew Chem Int Ed Engl 2021; 60:5323-5330. [PMID: 33289239 PMCID: PMC7986920 DOI: 10.1002/anie.202013899] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Indexed: 12/16/2022]
Abstract
Examined here are the structures of complexes of benzophenone microsolvated with up to three water molecules by using broadband rotational spectroscopy and the cold conditions of a molecular jet. The analysis shows that the water molecules dock sideways on benzophenone for the water monomer and dimer moieties, and they move above one of the aromatic rings when the water cluster grows to the trimer. The rotational spectra shows that the water trimer moiety in the complex adopts an open‐loop arrangement. Ab initio calculations face a dilemma of identifying the global minimum between the open loop and the closed loop, which is only solved when zero‐point vibrational energy correction is applied. An OH⋅⋅⋅π bond and a Bürgi‐Dunitz interaction between benzophenone and the water trimer are present in the cluster. This work shows the subtle balance between water–water and water–solute interactions when the solute molecule offers several different anchor sites for water molecules.
Collapse
Affiliation(s)
- Weixing Li
- Deutsches Elektronen-Synchrotron, Notkestrasse 85, 22607, Hamburg, Germany
| | | | - Pablo Pinacho
- Deutsches Elektronen-Synchrotron, Notkestrasse 85, 22607, Hamburg, Germany
| | - Melanie Schnell
- Deutsches Elektronen-Synchrotron, Notkestrasse 85, 22607, Hamburg, Germany.,Christian-Albrechts-Universität zu Kiel, Institute of Physical Chemistry, Max-Eyth-Str. 1, 24118, Kiel, Germany
| |
Collapse
|
7
|
Li W, Quesada‐Moreno MM, Pinacho P, Schnell M. Unlocking the Water Trimer Loop: Isotopic Study of Benzophenone‐(H
2
O)
1–3
Clusters with Rotational Spectroscopy. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202013899] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Weixing Li
- Deutsches Elektronen-Synchrotron Notkestrasse 85 22607 Hamburg Germany
| | | | - Pablo Pinacho
- Deutsches Elektronen-Synchrotron Notkestrasse 85 22607 Hamburg Germany
| | - Melanie Schnell
- Deutsches Elektronen-Synchrotron Notkestrasse 85 22607 Hamburg Germany
- Christian-Albrechts-Universität zu Kiel Institute of Physical Chemistry Max-Eyth-Str. 1 24118 Kiel Germany
| |
Collapse
|