1
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Taherivardanjani S, Wylie L, Dötzer R, Kirchner B. Exploring the Influence of the Phosphorus-Heteroatom Substitution in Nicotine on Its Electronic and Vibrational Spectroscopic Properties. Chemistry 2024; 30:e202302534. [PMID: 37984418 DOI: 10.1002/chem.202302534] [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: 08/03/2023] [Revised: 11/10/2023] [Accepted: 11/13/2023] [Indexed: 11/22/2023]
Abstract
The influence of phosphorus substitution of nitrogen in heterocyclic compounds on the vibrational spectroscopy as well as frontier molecular orbitals are analyzed. Nicotine with two nitrogen atoms in its structure is taken as the sample system to be studied computationally. By replacing the nitrogen atom in one or both rings of this molecule with phosphorus, three nicotine derivatives are created. The vibrational circular dichroism and infrared spectra of these four molecules in their monomer state, as well as the assemblies up to trimers are determined. The aforementioned spectra are calculated using static quantum chemical calculations employing a cluster-weighted approach. The calculated gas phase spectra of nicotine are compared to their respective experimental spectra. It is observed that the nicotine derivatives with phosphorus in the methylpyrrolidine ring have considerably different gas phase and bulk phase vibrational circular dichroism spectra when compared to nicotine. The phosphorus substitution reduces the energy gap between the highest occupied molecular orbital and the lowest unoccupied molecular orbital as well as altering the polarizability and reactivity of the investigated molecules.
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Affiliation(s)
- Shima Taherivardanjani
- Mulliken Center for Theoretical Chemistry, Institute for Physical and Theoretical Chemistry, Beringstr. 4, D-53115, Bonn, Germany
| | - Luke Wylie
- Mulliken Center for Theoretical Chemistry, Institute for Physical and Theoretical Chemistry, Beringstr. 4, D-53115, Bonn, Germany
| | | | - Barbara Kirchner
- Mulliken Center for Theoretical Chemistry, Institute for Physical and Theoretical Chemistry, Beringstr. 4, D-53115, Bonn, Germany
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2
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Blasius J, Drysch K, Pilz FH, Frömbgen T, Kielb P, Kirchner B. Efficient Prediction of Mole Fraction Related Vibrational Frequency Shifts. J Phys Chem Lett 2023; 14:10531-10536. [PMID: 37972218 DOI: 10.1021/acs.jpclett.3c02761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2023]
Abstract
While so far it has been possible to calculate vibrational spectra of mixtures at a particular composition, we present here a novel cluster approach for a fast and robust calculation of mole fraction dependent infrared and vibrational circular dichroism spectra at the example of acetonitrile/(R)-butan-2-ol mixtures. By assigning weights to a limited number of quantum chemically calculated clusters, vibrational spectra can be obtained at any desired composition by a weighted average of the single cluster spectra. In this way, peak positions carrying information about intermolecular interactions can be predicted. We show that mole fraction dependent peak shifts can be accurately modeled and, that experimentally recorded infrared spectra can be reproduced with high accuracy over the entire mixing range. Because only a very limited number of clusters is required, the presented approach is a valuable and computationally efficient tool to access mole fraction dependent spectra of mixtures on a routine basis.
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Affiliation(s)
- Jan Blasius
- Mulliken Center for Theoretical Chemistry, Clausius Institute of Physical and Theoretical Chemistry, University of Bonn, Beringstraße 4-6, D-53115 Bonn, Germany
| | - Katrin Drysch
- Mulliken Center for Theoretical Chemistry, Clausius Institute of Physical and Theoretical Chemistry, University of Bonn, Beringstraße 4-6, D-53115 Bonn, Germany
| | - Frank Hendrik Pilz
- Clausius Institute of Physical and Theoretical Chemistry, University of Bonn, Wegelerstraße 12, D-53115 Bonn, Germany
| | - Tom Frömbgen
- Mulliken Center for Theoretical Chemistry, Clausius Institute of Physical and Theoretical Chemistry, University of Bonn, Beringstraße 4-6, D-53115 Bonn, Germany
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Patrycja Kielb
- Clausius Institute of Physical and Theoretical Chemistry, University of Bonn, Wegelerstraße 12, D-53115 Bonn, Germany
- Transdisciplinary Research Area "Building Blocks of Matter and Fundamental Interactions" (TRA Matter), University of Bonn, D-53115 Bonn, Germany
| | - Barbara Kirchner
- Mulliken Center for Theoretical Chemistry, Clausius Institute of Physical and Theoretical Chemistry, University of Bonn, Beringstraße 4-6, D-53115 Bonn, Germany
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3
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Merten C. Modelling solute-solvent interactions in VCD spectra analysis with the micro-solvation approach. Phys Chem Chem Phys 2023; 25:29404-29414. [PMID: 37881890 DOI: 10.1039/d3cp03408a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2023]
Abstract
Vibrational circular dichroism (VCD) spectroscopy has become an important part of the (stereo-)chemists' toolbox as a reliable method for the determination of absolute configurations. Being the chiroptical version of infrared spectroscopy, it has also been recognized as being very sensitive to conformational changes and intermolecular interactions. This sensitivity originates from the fact that the VCD spectra of individual conformers are often more different than their IR spectra, so that changes in conformational distributions or band positions and intensities become more pronounced. What is an advantage for studies focussing on intermolecular interactions can, however, quickly turn into a major obstacle during AC determinations: solute-solvent interactions can have a strong influence on spectral signatures and they must be accurately treated when simulating VCD and IR spectra. In this perspective, we showcase selected examples which exhibit particularly pronounced solvent effects. It is demonstrated that it is typically sufficient to model solute-solvent interactions by placing single solvent molecules near hydrogen bonding sites of the solute and subsequently use the optimized structures for spectra simulations. This micro-solvation approach works reasonably well for medium-sized, not too conformationally flexible molecules. We thus also discuss its limitations and outline the next steps that method development needs to take in order to further improve the workflows for VCD spectra predictions.
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Affiliation(s)
- Christian Merten
- Ruhr Universität Bochum, Fakultät für Chemie und Biochemie, Organische Chemie II, Universitätsstraße 150, 44801 Bochum, Germany.
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4
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Blasius J, Kirchner B. Selective Chirality Transfer to the Bis(trifluoromethylsulfonyl)imide Anion of an Ionic Liquid. Chemistry 2023; 29:e202301239. [PMID: 37341169 DOI: 10.1002/chem.202301239] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 06/19/2023] [Accepted: 06/21/2023] [Indexed: 06/22/2023]
Abstract
Chirality transfer from the chiral molecule (R)-1,2-propylene oxide to the achiral anion of the 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquid is observed. The chiral probe selectively affects one part of the binary ionic liquid, i. e., it has previously been shown experimentally and theoretically that this particular imidazolium cation can be affected by chirality transfer, but in the present system chirality is almost exclusively transferred to the anion and not to both parts of the solvent (anion and cation). This observation is of high relevance because of its selectivity and because anion effects are usually much more important in ionic liquid research than cation effects. From ab initio molecular dynamics simulations, a conformational analysis and dissected vibrational circular dichroism spectra are obtained to study the chirality transfer. While in the neat ionic liquid two mirror imaged trans conformers of the anion occur almost equally, we observe an excess of one of these conformers in the presence of the chiral solute, causing optical activity of the anion. Although the cis conformers are not tremendously affected by the chirality transfer, they gain in total population when (R)-1,2-propylene oxide is dissolved in the ionic liquid.
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Affiliation(s)
- Jan Blasius
- Mulliken Center for Theoretical Chemistry, Clausius-Institute for Physical and Theoretical Chemistry, University of Bonn, Beringstraße 4-6, D-53115, Bonn, Germany
| | - Barbara Kirchner
- Mulliken Center for Theoretical Chemistry, Clausius-Institute for Physical and Theoretical Chemistry, University of Bonn, Beringstraße 4-6, D-53115, Bonn, Germany
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5
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Yeni O, Allouche AR, Legentil L, Ferrières V, Compagnon I. Conformational preferences of the flexible galactofuranose sugar in gas-phase. Phys Chem Chem Phys 2023. [PMID: 37465915 DOI: 10.1039/d3cp01671d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/20/2023]
Abstract
In contrast with the predominant pyranose form of galactose, galactofuranose is known to be highly flexible. Such flexibility poses a remarkable challenge in terms of structural studies, thus hindering the in depth understanding of the structure/function relationship in this rare sugar. A thorough computational study based on molecular dynamics and density functional theory supported by vibrational spectroscopy in the gas phase was carried out to provide a better understanding of the instrinsic conformational preferences of galactofuranose. Based on energetic and spectroscopic criteria, we report a subtantially reduced conformational landscape: methyl α-D-galactofuranose adopts E2/1E conformations and methyl β-D-galactofuranose adopts 1T2/1E conformations.
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Affiliation(s)
- Oznur Yeni
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne, France.
| | - Abdul-Rahman Allouche
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne, France.
| | - Laurent Legentil
- Univ. Rennes, Ecole Nationale Supérieure de Chimie de Rennes, F-35000 Rennes, France
| | - Vincent Ferrières
- Univ. Rennes, Ecole Nationale Supérieure de Chimie de Rennes, F-35000 Rennes, France
| | - Isabelle Compagnon
- Univ Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne, France.
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6
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Ditler E, Kumar C, Luber S. Vibrational circular dichroism spectra of natural products by means of the nuclear velocity perturbation theory. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 298:122769. [PMID: 37163900 DOI: 10.1016/j.saa.2023.122769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 03/24/2023] [Accepted: 04/18/2023] [Indexed: 05/12/2023]
Abstract
We present the application of the recently implemented nuclear velocity perturbation theory, using the combined Gaussian and plane waves approach in CP2K, to the vibrational circular dichroism (VCD) spectra of a set of natural products. Even though the calculations were carried out for isolated molecules in the gas-phase limit, neglecting inter-molecular interactions and anharmonic effects, the match between simulated and experimental spectra is reasonable. We also study the influence of different density functionals on the conformational search and the resulting VCD spectra via group coupling matrices (GCMs). The GCM analysis reveals that the VCD signal can in some cases arise from moieties which are close to each other and in other cases from moieties far from each other. Differences in spectra obtained using different exchange-correlation density functionals can be attributed to interaction terms between different moieties in the molecules changing their sign.
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Affiliation(s)
- Edward Ditler
- University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
| | - Chandan Kumar
- University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
| | - Sandra Luber
- University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland.
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7
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Jähnigen S, Le Barbu-Debus K, Guillot R, Vuilleumier R, Zehnacker A. How Crystal Symmetry Dictates Non-Local Vibrational Circular Dichroism in the Solid State. Angew Chem Int Ed Engl 2023; 62:e202215599. [PMID: 36441537 PMCID: PMC10107176 DOI: 10.1002/anie.202215599] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2022] [Revised: 11/28/2022] [Accepted: 11/28/2022] [Indexed: 11/29/2022]
Abstract
Solid-State Vibrational Circular Dichroism (VCD) can be used to determine the absolute structure of chiral crystals, but its interpretation remains a challenge in modern spectroscopy. In this work, we investigate the effect of a twofold screw axis on the solid-state VCD spectrum in a combined experimental and theoretical analysis of P21 crystals of (S)-(+)-1-indanol. Even though the space group is achiral, a single proper symmetry operation has an important impact on the VCD spectrum, which reflects the supramolecular chirality of the crystal. Distinguishing between contributions originating from molecular chirality and from chiral crystal packing, we find that while IR absorption hardly depends on the symmetry of the space group, the situation is different for VCD, where completely new non-local patterns emerge. Understanding the two underlying mechanisms, namely gauge transport and direct coupling, will help to use VCD to distinguish polymorphic forms.
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Affiliation(s)
- Sascha Jähnigen
- PASTEUR, Département de Chimie, Ecole Normale Supérieure, CNRS, PSL University, Sorbonne Université, 75005, Paris, France
| | - Katia Le Barbu-Debus
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Université Paris-Saclay, 91405, Orsay, France
| | - Régis Guillot
- Institut de Chimie Moléculaire et des Matériaux d'Orsay (ICMMO), CNRS, Université Paris-Saclay, 91405, Orsay, France
| | - Rodolphe Vuilleumier
- PASTEUR, Département de Chimie, Ecole Normale Supérieure, CNRS, PSL University, Sorbonne Université, 75005, Paris, France
| | - Anne Zehnacker
- Institut des Sciences Moléculaires d'Orsay (ISMO), CNRS, Université Paris-Saclay, 91405, Orsay, France
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8
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Taherivardanjani S, Blasius J, Brehm M, Dötzer R, Kirchner B. Conformer Weighting and Differently Sized Cluster Weighting for Nicotine and Its Phosphorus Derivatives. J Phys Chem A 2022; 126:7070-7083. [PMID: 36170053 DOI: 10.1021/acs.jpca.2c03133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Weighting methods applied to systems with many conformers have been broadly employed to calculate thermodynamic properties, structural characteristics, and populations. To better understand and test the sensitivity of conventional weighting methods, the conformational distributions of nicotine and its phosphorus-substituted derivatives are investigated. The weighting schemes used for this are all based on Boltzmann statistics. Classical Boltzmann factors based on the electronic energy and the Gibbs free energy are calculated at different quantum chemical levels of theory and compared to cluster weights obtained by the quantum cluster equilibrium method. Furthermore, the influence of the modified rigid-rotor-harmonic-oscillator (mRRHO) approximation on the cluster weights is investigated. The substitution of the nitrogen atom in the methylpyrrolidine ring by a phosphorus atom results in more monomer conformers and clusters being populated. The conformational distribution of the monomers remained stable at different levels of theory and weighting methods. However, going to dimers and trimers, we observe a significant influence of the level of theory, weighting method, and mRRHO cutoff on the populations of these clusters. We show that mRRHO cutoff values of 50 and 100 cm-1 yield similar results, which is why 50 cm-1 is recommended as a robust choice. Furthermore, we observe that the global minimum for ΔE0 and ΔG varies in a few cases and that the global minimum is not always the dominantly occupied structure.
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Affiliation(s)
- Shima Taherivardanjani
- Mulliken Center for Theoretical Chemistry, Clausius Institute of Physical and Theoretical Chemistry, University of Bonn, Beringstr. 4 + 6, D-53115 Bonn, Germany
| | - Jan Blasius
- Mulliken Center for Theoretical Chemistry, Clausius Institute of Physical and Theoretical Chemistry, University of Bonn, Beringstr. 4 + 6, D-53115 Bonn, Germany
| | - Martin Brehm
- Institut für Chemie, Martin-Luther-Universität Halle-Wittenberg, D-06120 Halle (Saale), Germany
| | - Reinhard Dötzer
- Competence Center Analytics, BASF SE, D-67056 Ludwigshafen, Germany
| | - Barbara Kirchner
- Mulliken Center for Theoretical Chemistry, Clausius Institute of Physical and Theoretical Chemistry, University of Bonn, Beringstr. 4 + 6, D-53115 Bonn, Germany
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9
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Galimberti DR. Vibrational Circular Dichroism from DFT Molecular Dynamics: The AWV Method. J Chem Theory Comput 2022; 18:6217-6230. [PMID: 36112978 PMCID: PMC9558311 DOI: 10.1021/acs.jctc.2c00736] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
The paper illustrates the Activity Weighted Velocities
(AWV) methodology
to compute Vibrational Circular Dichroism (VCD) anharmonic spectra
from Density Functional Theory (DFT) molecular dynamics. AWV calculates
the spectra by the Fourier Transform of the time correlation functions
of velocities, weighted by specific observables: the Atomic Polar
Tensors (APTs) and the Atomic Axial Tensors (AATs). Indeed, AWV shows
to correctly reproduce the experimental spectra for systems in the
gas and liquid phases, both in the case of weakly and strongly interacting
systems. The comparison with the experimental spectra is striking
especially in the fingerprint region, as demonstrated by the three
benchmark systems discussed: (1S)-Fenchone in the
gas phase, (S)-(−)-Propylene oxide in the
liquid phase, and (R)-(−)-2-butanol in the
liquid phase. The time evolution of APTs and AATs can be adequately
described by a linear combination of the tensors of a small set of
appropriate reference structures, strongly reducing the computational
cost without compromising accuracy. Additionally, AWV allows the partition
of the spectral signal in its molecular components without any expensive
postprocessing and any localization of the charge density or the wave
function.
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Affiliation(s)
- Daria Ruth Galimberti
- Institute for Molecules and Materials, Radboud University, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
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10
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Krupová M, Leszczenko P, Sierka E, Emma Hamplová S, Pelc R, Andrushchenko V. Vibrational Circular Dichroism Unravels Supramolecular Chirality and Hydration Polymorphism of Nucleoside Crystals. Chemistry 2022; 28:e202201922. [DOI: 10.1002/chem.202201922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2022] [Indexed: 11/07/2022]
Affiliation(s)
- Monika Krupová
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo náměstí 2 16610 Prague Czech Republic
- Hylleraas Centre for Quantum Molecular Sciences Department of Chemistry UiT The Arctic University of Norway N-9037 Tromsø Norway
| | - Patrycja Leszczenko
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo náměstí 2 16610 Prague Czech Republic
- Faculty of Chemistry Jagiellonian University Gronostajowa 2 30-387 Kraków Poland
| | - Ewa Sierka
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo náměstí 2 16610 Prague Czech Republic
- Faculty of Chemistry Jagiellonian University Gronostajowa 2 30-387 Kraków Poland
| | - Sára Emma Hamplová
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo náměstí 2 16610 Prague Czech Republic
- Department of Biology and Biochemistry University of Bath Claverton Down Bath BA2 7AY United Kingdom
| | - Radek Pelc
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo náměstí 2 16610 Prague Czech Republic
- Third Faculty of Medicine Charles University Ruská 87 10000 Prague Czech Republic
| | - Valery Andrushchenko
- Institute of Organic Chemistry and Biochemistry Czech Academy of Sciences Flemingovo náměstí 2 16610 Prague Czech Republic
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11
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Kirchner B, Blasius J, Alizadeh V, Gansäuer A, Hollóczki O. Chemistry Dissolved in Ionic Liquids. A Theoretical Perspective. J Phys Chem B 2022; 126:766-777. [PMID: 35034453 DOI: 10.1021/acs.jpcb.1c09092] [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 theoretical treatment of ionic liquids must focus now on more realistic models while at the same time keeping an accurate methodology when following recent ionic liquids research trends or allowing predictability to come to the foreground. In this Perspective, we summarize in three cases of advanced ionic liquid research what methodological progress has been made and point out difficulties that need to be overcome. As particular examples to discuss we choose reactions, chirality, and radicals in ionic liquids. All these topics have in common that an explicit or accurate treatment of the electronic structure and/or intermolecular interactions is required (accurate methodology), while at the same time system size and complexity as well as simulation time (realistic model) play an important role and must be covered as well.
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Affiliation(s)
- Barbara Kirchner
- Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstraße 4+6, D-53115 Bonn, Germany
| | - Jan Blasius
- Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstraße 4+6, D-53115 Bonn, Germany
| | - Vahideh Alizadeh
- Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstraße 4+6, D-53115 Bonn, Germany
| | - Andreas Gansäuer
- Kekulé-Institut für Organische Chemie und Biochemie, University of Bonn, Gerhard-Domagk-Straße 1, D-53121 Bonn, Germany
| | - Oldamur Hollóczki
- Mulliken Center for Theoretical Chemistry, University of Bonn, Beringstraße 4+6, D-53115 Bonn, Germany.,Department of Physical Chemistry, Faculty of Science and Technology, University of Debrecen, Egyetem tér 1, H-4010 Debrecen, Hungary
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12
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Taherivardanjani S, Elfgen R, Reckien W, Suarez E, Perlt E, Kirchner B. Benchmarking the Computational Costs and Quality of Vibrational Spectra from Ab Initio Simulations. ADVANCED THEORY AND SIMULATIONS 2021. [DOI: 10.1002/adts.202100293] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Shima Taherivardanjani
- Mulliken Center for Theoretical Chemistry Institute for Physical and Theoretical Chemistry Beringstr. 4 Bonn D‐53115 Germany
| | - Roman Elfgen
- Mulliken Center for Theoretical Chemistry Institute for Physical and Theoretical Chemistry Beringstr. 4 Bonn D‐53115 Germany
| | - Werner Reckien
- Mulliken Center for Theoretical Chemistry Institute for Physical and Theoretical Chemistry Beringstr. 4 Bonn D‐53115 Germany
| | - Estela Suarez
- Institute for Advanced Simulation Jülich Supercomputing Centre, Forschungszentrum Jülich GmbH Wilhelm‐Johnen‐Straße Jülich D‐52425 Germany
| | - Eva Perlt
- Otto Schott Institute of Materials Research Faculty of Physics and Astronomy Friedrich‐Schiller‐Universität Jena Löbdergraben 32 Jena D‐07743 Germany
| | - Barbara Kirchner
- Mulliken Center for Theoretical Chemistry Institute for Physical and Theoretical Chemistry Beringstr. 4 Bonn D‐53115 Germany
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13
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Vázquez-Fernández I, Drużbicki K, Fernandez-Alonso F, Mukhopadhyay S, Nockemann P, Parker SF, Rudić S, Stana SM, Tomkinson J, Yeadon DJ, Seddon KR, Plechkova NV. Spectroscopic Signatures of Hydrogen-Bonding Motifs in Protonic Ionic Liquid Systems: Insights from Diethylammonium Nitrate in the Solid State. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2021; 125:24463-24476. [PMID: 34795809 PMCID: PMC8592064 DOI: 10.1021/acs.jpcc.1c05137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 10/08/2021] [Indexed: 06/13/2023]
Abstract
Diethylammonium nitrate, [N0 0 2 2][NO3], and its perdeuterated analogue, [N D D 2 2] [NO3], were structurally characterized and studied by infrared, Raman, and inelastic neutron scattering (INS) spectroscopy. Using these experimental data along with state-of-the-art computational materials modeling, we report unambiguous spectroscopic signatures of hydrogen-bonding interactions between the two counterions. An exhaustive assignment of the spectral features observed with each technique has been provided, and a number of distinct modes related to NH···O dynamics have been identified. We put a particular emphasis on a detailed interpretation of the high-resolution, broadband INS experiments. In particular, the INS data highlight the importance of conformational degrees of freedom within the alkyl chains, a ubiquitous feature of ionic liquid (IL) systems. These findings also enable an in-depth physicochemical understanding of protonic IL systems, a first and necessary step to the tailoring of hydrogen-bonding networks in this important class of materials.
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Affiliation(s)
- Isabel Vázquez-Fernández
- The
QUILL Research Centre, School of Chemistry and Chemical Engineering, The Queen’s University of Belfast, Belfast BT9 5AG, Northern Ireland, U.K.
| | - Kacper Drużbicki
- Materials
Physics Center, CSIC-UPV/EHU, Paseo Manuel de Lardizabal 5, Donostia-San
Sebastian 20018, Spain
- Centre
of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza 112, Lodz 90-363, Poland
| | - Felix Fernandez-Alonso
- Materials
Physics Center, CSIC-UPV/EHU, Paseo Manuel de Lardizabal 5, Donostia-San
Sebastian 20018, Spain
- Donostia
International Physics Center (DIPC), Paseo Manuel de Lardizabal 4, Donostia-San
Sebastian 20018, Spain
- Department
of Physics and Astronomy, University College
London, Gower Street, London WC1E 6BT, U.K.
- Ikerbasque,
Basque Foundation for Science, Plaza Euskadi 5, Bilbao 48009, Spain
| | - Sanghamitra Mukhopadhyay
- ISIS
Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U.K.
- Department
of Materials, Imperial College London, Exhibition Road, London SW7 2AZ, U.K.
| | - Peter Nockemann
- The
QUILL Research Centre, School of Chemistry and Chemical Engineering, The Queen’s University of Belfast, Belfast BT9 5AG, Northern Ireland, U.K.
| | - Stewart F. Parker
- ISIS
Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U.K.
| | - Svemir Rudić
- ISIS
Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U.K.
| | - Simona-Maria Stana
- The
QUILL Research Centre, School of Chemistry and Chemical Engineering, The Queen’s University of Belfast, Belfast BT9 5AG, Northern Ireland, U.K.
| | - John Tomkinson
- ISIS
Facility, Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, U.K.
| | - Darius J. Yeadon
- The
QUILL Research Centre, School of Chemistry and Chemical Engineering, The Queen’s University of Belfast, Belfast BT9 5AG, Northern Ireland, U.K.
| | - Kenneth R. Seddon
- The
QUILL Research Centre, School of Chemistry and Chemical Engineering, The Queen’s University of Belfast, Belfast BT9 5AG, Northern Ireland, U.K.
| | - Natalia V. Plechkova
- The
QUILL Research Centre, School of Chemistry and Chemical Engineering, The Queen’s University of Belfast, Belfast BT9 5AG, Northern Ireland, U.K.
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14
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Jähnigen S, Sebastiani D, Vuilleumier R. The important role of non-covalent interactions for the vibrational circular dichroism of lactic acid in aqueous solution. Phys Chem Chem Phys 2021; 23:17232-17241. [PMID: 34369531 DOI: 10.1039/d1cp03106f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
We present a computational study of vibrational circular dichroism (VCD) in solutions of (S)-lactic acid, relying on ab initio molecular dynamics (AIMD) and full solvation with bulk water. We discuss the effect of the hydrogen bond network on the aggregation behaviour of the acid: while aggregates of the solute represent conditions encountered in a weakly interacting solvent, the presence of water drastically interferes with the clusters - more strongly than originally anticipated. For both scenarios we computed the VCD spectra by means of nuclear velocity perturbation theory (NVPT). The comparison with experimental data allows us to establish a VCD-structure relationship that includes the solvent network around the chiral solute. We suggest that fundamental modes with strong polarisation such as the carbonyl stretching vibration can borrow VCD from the chirally restructured solvent cage, which extends the common explanatory models of VCD generation in aqueous solution.
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Affiliation(s)
- Sascha Jähnigen
- PASTEUR, Département de chimie, École normale supérieure, PSL University, Sorbonne Université, CNRS, 75005, Paris, France.
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Blasius J, Zaby P, Hollóczki O, Kirchner B. Recognition in Chiral Ionic Liquids: The Achiral Cation Makes the Difference! J Org Chem 2021; 87:1867-1873. [PMID: 34319732 DOI: 10.1021/acs.joc.1c00939] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
By simulating butan-2-ol dissolved in the chiral ionic liquid 1-ethyl-3-methylimidazolium (S)-alaninate, we investigate the chiral recognition of butan-2-ol in the ionic liquid. The hydrogen bonding between the chiral anion and both enantiomers of butan-2-ol is similar; however, both chiral molecules (anion and alcohol) induce an asymmetry in the achiral cation which leads to a more favorable environment for the alcohol in the heterochiral system as compared to the homochiral system and hence provides an energetic stabilization of the former.
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Affiliation(s)
- Jan Blasius
- Mulliken Center for Theoretical Chemistry, Rheinische Friedrich-Wilhelms-Universität Bonn, Beringstr. 4+6, D-53115 Bonn, Germany
| | - Paul Zaby
- Mulliken Center for Theoretical Chemistry, Rheinische Friedrich-Wilhelms-Universität Bonn, Beringstr. 4+6, D-53115 Bonn, Germany
| | - Oldamur Hollóczki
- Mulliken Center for Theoretical Chemistry, Rheinische Friedrich-Wilhelms-Universität Bonn, Beringstr. 4+6, D-53115 Bonn, Germany
| | - Barbara Kirchner
- Mulliken Center for Theoretical Chemistry, Rheinische Friedrich-Wilhelms-Universität Bonn, Beringstr. 4+6, D-53115 Bonn, Germany
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