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Danten Y, Gatti C, Frayret C. Seeking for Optimal Excited States in Photoinduced Electron-Transfer Processes─The Case Study of Brooker's Merocyanine. J Phys Chem A 2022; 126:9577-9593. [PMID: 36534011 DOI: 10.1021/acs.jpca.2c04269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Material design enters an era in which control of electrons in atoms, molecules, and materials is an essential property to be predicted and thoroughly understood in view of discovering new compounds with properties optimized toward specific optical/optoelectronic applications. π-electronic delocalization and charge separation/recombination enter notably into the set of features that are highly desirable to tailor. Diverse domains are particularly relying on photoinduced electron-transfer (PET), including fields of paramount importance such as energy production through light-harvesting, efficient chemoreceptive sensors, or organic field-effect transistors. In view of completing the arsenal of strategies in this area, we selected Brooker's merocyanine─a typical [D-π-A] compound─as the case study and examined from time-dependent density functional theory the opportunity offered by selected excited states to reach a suited manipulation of the charge transfer (CT) extent. In addition to the consideration of diagnostic tools able to spot the charge amount (i.e., magnitude of electron fraction) transferred upon excitation (qCT), the spatial extent associated with such an electronic transition or CT length (DCT), as well as the corresponding variation in dipole moment between the ground and the excited states (μCT), further analysis of the excitation process was undertaken. The advantage of going beyond the above-mentioned molecular indicators─which can be considered as PET global indices─was explored on the basis of a partitioning of the electron density. Relevant insight was gained on the relation these global indices have with the evolution of (local) features characterizing either chemical bond or electron delocalization upon vertical excitations.
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Affiliation(s)
- Yann Danten
- Institut des Sciences Moléculaires, UMR CNRS 5255, Université de Bordeaux, 351 Cours de la Libération, 33405Talence, France
| | - Carlo Gatti
- CNR SCITEC, CNR Istituto di Scienze e Tecnologie Chimiche ''Giulio Natta'', Sede Via C. Golgi, 19, 20133Milano, Italy
| | - Christine Frayret
- Laboratoire de Réactivité et Chimie des Solides (LRCS), UMR CNRS 7314, Université de Picardie Jules Verne, Hub de l'Energie, 15, Rue Baudelocque, 80039Amiens Cedex, France.,Réseau sur le Stockage Electrochimique de l'Energie (RS2E), CNRS FR3459, 15 rue Baudelocque, 80039Amiens Cedex, France
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2
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Aliyarova IS, Tupikina EY, Soldatova NS, Ivanov DM, Postnikov PS, Yusubov M, Kukushkin VY. Halogen Bonding Involving Gold Nucleophiles in Different Oxidation States. Inorg Chem 2022; 61:15398-15407. [PMID: 36137295 DOI: 10.1021/acs.inorgchem.2c01858] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A single-crystal X-ray diffraction (XRD) study of diaryliodonium tetrachloroaurates (or, in the recent terminology, tetrachloridoaurates), [(p-XC6H4)2I][AuCl4] (X = Cl, 1; Br, 2), was performed for 1 (the structure is denoted as 1a to show similarity with the isomorphic structure 2a) and two polymorphs─2a (obtained from MeOH) and 2b (from 1,2-C2H4Cl2). Examination of the XRD data for these three structures revealed 2-center C-X···AuIII (X = Cl and Br) and 3-center bifurcated C-Br···(Cl-Au) halogen bonding (abbreviated as XB) between the p-Cl or p-Br atoms of the diaryliodonium cations and the gold(III) atom of [AuCl4]-. The noncovalent nature of AuIII-involving interactions, the nucleophilicity of the gold(III) atoms, and the electrophilic role of p-X atoms of the diaryliodonium cations in the XBs were studied by a set of complementary computational methods. Combined experimental and theoretical studies allowed the recognition of the d-nucleophilicity of the [d8AuIII] atom which, regardless of its rather substantial formal 3+ charge, can function as a d-nucleophilic partner of XB. This conclusion was also supported by theoretical calculations performed for the structures' refcodes BINXOM and ICSD 62511; the obtained data verified the nucleophilicity of AuIII toward a K+ ions or a σ-(Cl)-hole, respectively. All our results, together with consideration of relevant literature, indicate that gold atoms in the three oxidation states (0, I, and even III) exhibit nucleophilicity in XBs.
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Affiliation(s)
- Irina S Aliyarova
- Institute of Chemistry, Saint Petersburg State University, Universitetskaya Nab. 7/9, Saint Petersburg 199034, Russian Federation.,Research School of Chemistry and Applied Biomedical Sciences, Tomsk Polytechnic University, Tomsk 634034, Russian Federation
| | - Elena Yu Tupikina
- Institute of Chemistry, Saint Petersburg State University, Universitetskaya Nab. 7/9, Saint Petersburg 199034, Russian Federation
| | - Natalia S Soldatova
- Research School of Chemistry and Applied Biomedical Sciences, Tomsk Polytechnic University, Tomsk 634034, Russian Federation
| | - Daniil M Ivanov
- Institute of Chemistry, Saint Petersburg State University, Universitetskaya Nab. 7/9, Saint Petersburg 199034, Russian Federation.,Research School of Chemistry and Applied Biomedical Sciences, Tomsk Polytechnic University, Tomsk 634034, Russian Federation
| | - Pavel S Postnikov
- Research School of Chemistry and Applied Biomedical Sciences, Tomsk Polytechnic University, Tomsk 634034, Russian Federation.,Department of Solid State Engineering, Institute of Chemical Technology, Prague 16628, Czech Republic
| | - Mekhman Yusubov
- Research School of Chemistry and Applied Biomedical Sciences, Tomsk Polytechnic University, Tomsk 634034, Russian Federation
| | - Vadim Yu Kukushkin
- Institute of Chemistry, Saint Petersburg State University, Universitetskaya Nab. 7/9, Saint Petersburg 199034, Russian Federation.,Institute of Chemistry and Pharmaceutical Technologies, Altai State University, 656049 Barnaul, Russian Federation
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3
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Salazar-Lozas H, Guevara-Vela JM, Pendás ÁM, Francisco E, Rocha-Rinza T. Partition of the electronic energy of the PM7 method via the interacting quantum atoms approach. Phys Chem Chem Phys 2022; 24:19521-19530. [PMID: 35938407 DOI: 10.1039/d2cp02013k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Partitions of the electronic energy such as that provided by the Interacting Quantum Atoms (IQA) approach have given valuable insights for numerous chemical systems and processes. Unfortunately, this kind of analysis may involve the integration of scalar fields over very irregular volumes, a condition which leads to a large and often prohibitive computational effort. These circumstances have limited the use of these energy partitions to systems comprising a few tens of atoms at most. On the other hand, semiempirical methods have proved useful in the study of systems of several thousands of atoms. Therefore, the goal of this work is to carry out partitions of the semiempirical method PM7 in compliance with the IQA approach. For this purpose, we computed one- and two-atomic energetic contributions whose sum equals the PM7 electronic energy. We illustrate how one might exploit the partition of electronic energies computed via the PM7 method by considering small organic and inorganic molecules and the energetics of individual hydrogen bond interactions within several water clusters which include (H2O)30, (H2O)50 and (H2O)100. We also considered the solvation of the amphiphilic caprylate anion to exemplify how to exploit the energy partition proposed in this paper. Overall, this investigation shows how the approach put forward herein might give further insights of the interactions occurring within complex systems in physical and biological chemistry.
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Affiliation(s)
- Hugo Salazar-Lozas
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Alcaldía Coyoacán C.P. 04510, Ciudad de México, Mexico.
| | | | - Ángel Martín Pendás
- Departamento de Química Física y Analítica, Universidad de Oviedo, Julián Claveria 8, 33006, Oviedo, Spain
| | - Evelio Francisco
- Departamento de Química Física y Analítica, Universidad de Oviedo, Julián Claveria 8, 33006, Oviedo, Spain
| | - Tomás Rocha-Rinza
- Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad Universitaria, Alcaldía Coyoacán C.P. 04510, Ciudad de México, Mexico.
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4
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Aliyarova IS, Tupikina EY, Ivanov DM, Kukushkin VY. Metal-Involving Halogen Bonding Including Gold(I) as a Nucleophilic Partner. The Case of Isomorphic Dichloroaurate(I)·Halomethane Cocrystals. Inorg Chem 2022; 61:2558-2567. [DOI: 10.1021/acs.inorgchem.1c03482] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Irina S. Aliyarova
- Institute of Chemistry, Saint Petersburg State University, Universitetskaya Nab. 7/9, Saint Petersburg 199034, Russian Federation
| | - Elena Yu. Tupikina
- Institute of Chemistry, Saint Petersburg State University, Universitetskaya Nab. 7/9, Saint Petersburg 199034, Russian Federation
| | - Daniil M. Ivanov
- Institute of Chemistry, Saint Petersburg State University, Universitetskaya Nab. 7/9, Saint Petersburg 199034, Russian Federation
| | - Vadim Yu. Kukushkin
- Institute of Chemistry, Saint Petersburg State University, Universitetskaya Nab. 7/9, Saint Petersburg 199034, Russian Federation
- Institute of Chemistry and Pharmaceutical Technologies, Altai State University, Barnaul 656049, Russian Federation
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5
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Zelenkov LE, Eliseeva AA, Baykov S, Ivanov DM, Sumina AI, Gomila RM, Frontera A, Kukushkin VY, Bokach NA. Inorganic–Organic {dz2-MIIS4}···π-Hole Stacking in Reverse Sandwich Structures. The Case of Cocrystals of Group 10 Metal Dithiocarbamates with Electron-deficient Arenes. Inorg Chem Front 2022. [DOI: 10.1039/d2qi00438k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cocrystallization of the dithiocarbamate complexes [M(S2CNEt2)2] (M = Ni 1, Pd 2, Pt 3) and X-substituted perfluoroarenes (X = I, Br; 1,2-dibromoperfluorobenzene FBrB and 1,2-diiodoperfluorobenzene FIB) gives isomorphous cocrystals of...
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Hoffmann G, Tognetti V, Joubert L. Electrophilicity Indices and Halogen Bonds: Some New Alternatives to the Molecular Electrostatic Potential. J Phys Chem A 2020; 124:2090-2101. [DOI: 10.1021/acs.jpca.9b10233] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Guillaume Hoffmann
- Normandy University, COBRA UMR 6014 & FR 3038, Université de Rouen INSA Rouen, CNRS, 1 rue Tesniére 76821 Mont St Aignan. Cedex, France
| | - Vincent Tognetti
- Normandy University, COBRA UMR 6014 & FR 3038, Université de Rouen INSA Rouen, CNRS, 1 rue Tesniére 76821 Mont St Aignan. Cedex, France
| | - Laurent Joubert
- Normandy University, COBRA UMR 6014 & FR 3038, Université de Rouen INSA Rouen, CNRS, 1 rue Tesniére 76821 Mont St Aignan. Cedex, France
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7
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Graton J, Rahali S, Le Questel JY, Montavon G, Pilmé J, Galland N. Spin-orbit coupling as a probe to decipher halogen bonding. Phys Chem Chem Phys 2018; 20:29616-29624. [PMID: 30318527 DOI: 10.1039/c8cp05690k] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The nature of halogen-bond interactions is scrutinized from the perspective of astatine, the heaviest halogen element. Potentially the strongest halogen-bond donor, its ability is shown to be deeply affected by relativistic effects and especially by the spin-orbit coupling. Complexes between a series of XY dihalogens (X, Y = At, I, Br, Cl and F) and ammonia are studied with two-component relativistic quantum calculations, revealing that the spin-orbit interaction leads to a weaker halogen-bond donating ability of the diastatine species with respect to diiodine. In addition, the donating ability of the lighter halogen elements, iodine and bromine, in the AtI and AtBr species is more decreased by the spin-orbit coupling than that of astatine. This can only be rationalized from the evolution of a charge-transfer descriptor, the local electrophilicity ω+S,max, determined for the pre-reactive XY species. Finally, the investigation of the spin-orbit coupling effects by means of quantum chemical topology methods allows us to unveil the connection between the astatine propensity to form charge-shift bonds and the astatine ability to engage in halogen bonds.
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Affiliation(s)
- Jérôme Graton
- Université de Nantes, CEISAM, UMR CNRS 6230, 2 Rue de la Houssinière, BP 92208, 44322 Nantes Cedex 3, France.
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8
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Malček M, Bučinský L, Teixeira F, Cordeiro MNDS. Detection of simple inorganic and organic molecules over Cu-decorated circumcoronene: a combined DFT and QTAIM study. Phys Chem Chem Phys 2018; 20:16021-16032. [PMID: 29850712 DOI: 10.1039/c8cp02035c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Nowadays graphene materials have attracted a considerable attention because of their potential utilization as gas sensors, biosensors, or adsorbents. Doping or decorating the graphene surface with transition metals can significantly tune its electronic properties and chemical reactivity. Circumcoronene, being a polyaromatic hydrocarbon composed of 19 benzene rings, can be used as a model system of a tiny graphene quantum dot. The adsorption of a set of small molecules (water, hydrogen peroxide, methanol, ethanol, and oxygen) over the copper-decorated circumcoronene was theoretically investigated using density functional theory (DFT) and Bader's quantum theory of atoms in molecules (QTAIM). Following the obtained B3LYP energies, the adsorption of O2 and the chemisorption of H2O2 were found to be energetically the most favorable, with energetic outcomes of -3.6 eV and -3.7 eV, respectively. Moreover, an H2O2 molecule was decomposed during the chemisorption on the Cu atom to form a neutral Cu(OH)2 molecule. Changes in the electronic structure of the studied systems, in particular the oxidation of copper, after the adsorption were investigated within the framework of QTAIM (e.g., charges, bond critical points, and delocalization indices) and partial density of states (PDOS) analysis. The results of this study suggest the suitability of the Cu-decorated graphene materials as adsorbents and/or gas sensors in practical applications.
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Affiliation(s)
- Michal Malček
- LAQV@REQUIMTE, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, Rua do Campo Alegre s/n, 4169-007 Porto, Portugal.
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9
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Bil A, Latajka Z, Biczysko M. Hydrogen detachment driven by a repulsive 1πσ* state – an electron localization function study of 3-amino-1,2,4-triazole. Phys Chem Chem Phys 2018; 20:5210-5216. [DOI: 10.1039/c7cp06744e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Electron localization function analysis reveals the details of a charge induced hydrogen detachment mechanism of 3-amino-1,2,4-triazole, identified recently as responsible for phototautomerization of the molecule.
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Affiliation(s)
- Andrzej Bil
- Faculty of Chemistry
- University of Wrocław
- 50-383 Wrocław
- Poland
| | | | - Malgorzata Biczysko
- International Centre for Quantum and Molecular Structures (ICQMS)
- College of Sciences
- Shanghai University
- 200444 Shanghai
- China
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10
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Mignot M, Schammé B, Tognetti V, Joubert L, Cardinael P, Peulon-Agasse V. Anthracenyl polar embedded stationary phases with enhanced aromatic selectivity. Part II: A density functional theory study. J Chromatogr A 2017; 1519:91-99. [DOI: 10.1016/j.chroma.2017.08.083] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 08/28/2017] [Accepted: 08/30/2017] [Indexed: 12/28/2022]
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11
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Matthies O, Grin Y, Kohout M. Absent Diamond-to-β-SnPhase Transition for Carbon: Quantum Chemical Topology Approach. ChemistrySelect 2017. [DOI: 10.1002/slct.201700828] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Olga Matthies
- Max-Planck-Institut für Chemische Physik fester Stoffe; Nöthnitzer Straße 40 01187 Dresden Germany
| | - Yuri Grin
- Max-Planck-Institut für Chemische Physik fester Stoffe; Nöthnitzer Straße 40 01187 Dresden Germany
| | - Miroslav Kohout
- Max-Planck-Institut für Chemische Physik fester Stoffe; Nöthnitzer Straße 40 01187 Dresden Germany
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12
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Tognetti V, Joubert L. On Atoms‐in‐Molecules Energies from Kohn–Sham Calculations. Chemphyschem 2017; 18:2675-2687. [DOI: 10.1002/cphc.201700637] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Revised: 07/01/2017] [Indexed: 12/29/2022]
Affiliation(s)
- Vincent Tognetti
- Normandy Univ. COBRA UMR 6014 & FR 3038Université de Rouen, INSA Rouen, CNRS 1 rue Tesniére 76821 Mont St Aignan, Cedex France
| | - Laurent Joubert
- Normandy Univ. COBRA UMR 6014 & FR 3038Université de Rouen, INSA Rouen, CNRS 1 rue Tesniére 76821 Mont St Aignan, Cedex France
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13
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Rombouts JA, Ehlers AW, Lammertsma K. A quantitative analysis of light-driven charge transfer processes using voronoi partitioning of time dependent DFT-derived electron densities. J Comput Chem 2017; 38:1811-1818. [PMID: 28555891 PMCID: PMC6585665 DOI: 10.1002/jcc.24822] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 04/12/2017] [Accepted: 04/12/2017] [Indexed: 11/17/2022]
Abstract
An analytical method is presented that provides quantitative insight into light-driven electron density rearrangement using the output of standard time-dependent density functional theory (TD-DFT) computations on molecular compounds. Using final and initial electron densities for photochemical processes, the subtraction of summed electron density in each atom-centered Voronoi polyhedron yields the electronic charge difference, QVECD . This subtractive method can also be used with Bader, Mulliken and Hirshfeld charges. A validation study shows QVECD to have the most consistent performance across basis sets and good conservation of charge between electronic states. Besides vertical transitions, relaxation processes can be investigated as well. Significant electron transfer is computed for isomerization on the excited state energy surface of azobenzene. A number of linear anilinepyridinium donor-bridge-acceptor chromophores was examined using QVECD to unravel the influence of its pi-conjugated bridge on charge separation. Finally, the usefulness of the presented method as a tool in optimizing charge transfer is shown for a homologous series of organometallic pigments. The presented work allows facile calculation of a novel, relevant quantity describing charge transfer processes at the atomic level. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Jeroen A. Rombouts
- Department of Chemistry and Pharmaceutical SciencesVrije Universiteit AmsterdamDe Boelelaan 1083 & 1085AmsterdamHV1081The Netherlands
| | - Andreas W. Ehlers
- Department of Chemistry and Pharmaceutical SciencesVrije Universiteit AmsterdamDe Boelelaan 1083 & 1085AmsterdamHV1081The Netherlands
- Department of ChemistryUniversity of JohannesburgAuckland ParkJohannesburgSouth Africa2006
| | - Koop Lammertsma
- Department of Chemistry and Pharmaceutical SciencesVrije Universiteit AmsterdamDe Boelelaan 1083 & 1085AmsterdamHV1081The Netherlands
- Department of ChemistryUniversity of JohannesburgAuckland ParkJohannesburgSouth Africa2006
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14
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Tognetti V, Guégan F, Luneau D, Chermette H, Morell C, Joubert L. Structural effects in octahedral carbonyl complexes: an atoms-in-molecules study. Theor Chem Acc 2017. [DOI: 10.1007/s00214-017-2116-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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15
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Teixeira F, Mosquera R, Melo A, Freire C, Cordeiro MNDS. Driving Forces in the Sharpless Epoxidation Reaction: A Coupled AIMD/QTAIM Study. Inorg Chem 2017; 56:2124-2134. [PMID: 28134513 DOI: 10.1021/acs.inorgchem.6b02770] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
In order to better understand the epoxide-formation step of the Sharpless epoxidation process, a set of 263 oxygen-transfer reactions reflecting the complexity of the Sharpless epoxidation process were studied using density functional theory (DFT) and Bader's quantum theory of atoms in molecules (QTAIM). The diversity within these reactions reflects the different ligands in the coordination sphere of vanadium and also different substrates (alkene and an allylic alcohol both free and in the form of an alcoxo ligand). The transition states for 76 of these reactions were also characterized using DFT and QTAIM, allowing for an estimation of the impact of the different ligands and substrates on the activation barriers. A smaller subset of the latter was further subjected to an ab initio molecular dynamics (AIMD) simulation coupled to QTAIM analysis. The results show that the type of active catalyst plays an important role in the thermodinamic outcome of these reactions, with vanadium(V) tert-butylhydroperoxide adducts being responsible for the most exoenergetic reactions. On the other hand, the different ligands tested play only a limited role in modulating the thermodynamics and kinetics of these reactions. Moreover, no evidence was found to support a thermodynamic or kinetic preference for the epoxidation of an allylic alcohol over that of an unfunctionalized alkene. However, the results suggest that the reaction path is strongly influenced by the orientation of the substrate upon approximation to the active catalyst, confirming the well-known regioselectivity of the Sharpless epoxidation process.
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Affiliation(s)
- Filipe Teixeira
- LAQV-REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto , Rua do Campo Alegre, 4169-007 Porto, Portugal
| | - Ricardo Mosquera
- Departamento de Química Física, Facultade de Química, Universidade de Vigo , 36310 Vigo, Galicia, Spain
| | - André Melo
- LAQV-REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto , Rua do Campo Alegre, 4169-007 Porto, Portugal
| | - Cristina Freire
- LAQV-REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto , Rua do Campo Alegre, 4169-007 Porto, Portugal
| | - M Natália D S Cordeiro
- LAQV-REQUIMTE, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade do Porto , Rua do Campo Alegre, 4169-007 Porto, Portugal
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First Principle Modelling of Materials and Processes in Dye-Sensitized Photoanodes for Solar Energy and Solar Fuels. COMPUTATION 2017. [DOI: 10.3390/computation5010005] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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17
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Vannay L, Brémond E, de Silva P, Corminboeuf C. Visualizing and Quantifying Interactions in the Excited State. Chemistry 2016; 22:18442-18449. [DOI: 10.1002/chem.201603914] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Indexed: 02/01/2023]
Affiliation(s)
- Laurent Vannay
- Laboratory for Computational Molecular Design; Ecole Polytechnique Fédérale de Lausanne; 1015 Lausanne Switzerland
| | - Eric Brémond
- Laboratory for Computational Molecular Design; Ecole Polytechnique Fédérale de Lausanne; 1015 Lausanne Switzerland
- CompuNet; Istituto Italiano di Tecnologia; via Morego 30 16163 Genoa Italy
| | - Piotr de Silva
- Laboratory for Computational Molecular Design; Ecole Polytechnique Fédérale de Lausanne; 1015 Lausanne Switzerland
- Department of Chemistry; Massachusetts Institute of Technology; Cambridge Massachusetts 02139 USA
| | - Clémence Corminboeuf
- Laboratory for Computational Molecular Design; Ecole Polytechnique Fédérale de Lausanne; 1015 Lausanne Switzerland
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Schammé B, Mignot M, Couvrat N, Tognetti V, Joubert L, Dupray V, Delbreilh L, Dargent E, Coquerel G. Molecular Relaxations in Supercooled Liquid and Glassy States of Amorphous Quinidine: Dielectric Spectroscopy and Density Functional Theory Approaches. J Phys Chem B 2016; 120:7579-92. [PMID: 27391029 DOI: 10.1021/acs.jpcb.6b04242] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
In this article, we conduct a comprehensive molecular relaxation study of amorphous Quinidine above and below the glass-transition temperature (Tg) through broadband dielectric relaxation spectroscopy (BDS) experiments and theoretical density functional theory (DFT) calculations, as one major issue with the amorphous state of pharmaceuticals is life expectancy. These techniques enabled us to determine what kind of molecular motions are responsible, or not, for the devitrification of Quinidine. Parameters describing the complex molecular dynamics of amorphous Quinidine, such as Tg, the width of the α relaxation (βKWW), the temperature dependence of α-relaxation times (τα), the fragility index (m), and the apparent activation energy of secondary γ relaxation (Ea-γ), were characterized. Above Tg (> 60 °C), a medium degree of nonexponentiality (βKWW = 0.5) was evidenced. An intermediate value of the fragility index (m = 86) enabled us to consider Quinidine as a glass former of medium fragility. Below Tg (< 60 °C), one well-defined secondary γ relaxation, with an apparent activation energy of Ea-γ = 53.8 kJ/mol, was reported. From theoretical DFT calculations, we identified the most reactive part of Quinidine moieties through exploration of the potential energy surface. We evidenced that the clearly visible γ process has an intramolecular origin coming from the rotation of the CH(OH)C9H14N end group. An excess wing observed in amorphous Quinidine was found to be an unresolved Johari-Goldstein relaxation. These studies were supplemented by sub-Tg experimental evaluations of the life expectancy of amorphous Quinidine by X-ray powder diffraction and differential scanning calorimetry. We show that the difference between Tg and the onset temperature for crystallization, Tc, which is 30 K, is sufficiently large to avoid recrystallization of amorphous Quinidine during 16 months of storage under ambient conditions.
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Affiliation(s)
- Benjamin Schammé
- Normandie Univ, Laboratoire SMS - EA3233, Univ Rouen , F-76821 Mont Saint Aignan, France.,AMME-LECAP EA 4528 International Lab, Avenue de l'Université, BP12, Normandie Univ, Université de Rouen Normandie , 76801 St Etienne du Rouvray, France
| | - Mélanie Mignot
- Normandie Univ, Laboratoire SMS - EA3233, Univ Rouen , F-76821 Mont Saint Aignan, France
| | - Nicolas Couvrat
- Normandie Univ, Laboratoire SMS - EA3233, Univ Rouen , F-76821 Mont Saint Aignan, France
| | - Vincent Tognetti
- COBRA UMR 6014 and FR 3038, Normandie Univ, Université de Rouen, INSA Rouen, CNRS , F-76821 Mont Saint Aignan, Cedex, France
| | - Laurent Joubert
- COBRA UMR 6014 and FR 3038, Normandie Univ, Université de Rouen, INSA Rouen, CNRS , F-76821 Mont Saint Aignan, Cedex, France
| | - Valérie Dupray
- Normandie Univ, Laboratoire SMS - EA3233, Univ Rouen , F-76821 Mont Saint Aignan, France
| | - Laurent Delbreilh
- AMME-LECAP EA 4528 International Lab, Avenue de l'Université, BP12, Normandie Univ, Université de Rouen Normandie , 76801 St Etienne du Rouvray, France
| | - Eric Dargent
- AMME-LECAP EA 4528 International Lab, Avenue de l'Université, BP12, Normandie Univ, Université de Rouen Normandie , 76801 St Etienne du Rouvray, France
| | - Gérard Coquerel
- Normandie Univ, Laboratoire SMS - EA3233, Univ Rouen , F-76821 Mont Saint Aignan, France
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