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Ludwig R. Towards thermodynamically stable anionic dimers with “anti-electrostatic” hydrogen bonds overcoming like-charge repulsion. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Quiñonero D, Alkorta I, Elguero J. Metastable Dianions and Dications. Chemphyschem 2020; 21:1597-1607. [PMID: 32314864 DOI: 10.1002/cphc.202000172] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Revised: 04/13/2020] [Indexed: 12/17/2022]
Abstract
A theoretical study of metastable dianions and dications has been carried out at the CCSD(T)//MP2 level. MX3 2- and LX4 2- (M=Li and Na, L=Be and Mg, X=F and Cl) have been considered as dianions, M3 X2+ (M=Li and Na, X=F and Cl), YH3 2+ and ZH4 2+ (Y=F and Cl and Z=O, S) as dications. Minima structures are found in all cases, but they are less stable than the corresponding dissociated pair of mono-ions. The dissociation profile of the molecules in two mono-ions has been explored showing in all cases a maximum that prevent their spontaneous dissociation. The strength and nature of the chemical bond in the dianions and dications have been analyzed with the QTAIM, NBO and LMOEDA method and compared to the corresponding monoanions and monocations.
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Affiliation(s)
- David Quiñonero
- Departament de Química, Universitat de les Illes Balears, Crta. de Valldemossa km 7.5, 07122, Palma de Mallorca, Spain
| | - Ibon Alkorta
- Instituto de Química Médica (CSIC), Juan de la Cierva, 3. 28006, Madrid, Spain
| | - Jose Elguero
- Instituto de Química Médica (CSIC), Juan de la Cierva, 3. 28006, Madrid, Spain
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Understanding the Behavior of Fully Non-Toxic Polypyrrole-Gelatin and Polypyrrole-PVdF Soft Actuators with Choline Ionic Liquids. ACTUATORS 2020. [DOI: 10.3390/act9020040] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Smart and soft electroactive polymer actuators as building blocks for soft robotics have many beneficial properties that could make them useful in future biomimetic and biomedical applications. Gelatin—a material exploited for medical applications—can be used to make a fully biologically benign soft electroactive polymer actuator that provides high performance and has been shown to be harmless. In our study, these polypyrrole-gelatin trilayer actuators with choline acetate and choline isobutyrate showed the highest strain difference and highest efficiency in strain difference to charge density ratios compared to a reference system containing imidazolium-based ionic liquid and a traditional polyvinylidene fluoride (PVdF) membrane material. As neither the relative ion sizes nor the measured parameters of the ionic liquids could explain their behavior in the actuators, molecular dynamics simulations and density functional theory calculations were conducted. Strong cation-cation clustering was found and the radial distribution functions provided further insight into the topic, showing that the cation-cation correlation peak height is a good predictor of strain difference of the actuators.
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Grabowski SJ, Casanova D, Formoso E, Ugalde JM. Tetravalent Oxygen and Sulphur Centres Mediated by Carborane Superacid: Theoretical Analysis. Chemphyschem 2019; 20:2443-2450. [PMID: 31411374 DOI: 10.1002/cphc.201900687] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2019] [Revised: 08/09/2019] [Indexed: 11/09/2022]
Abstract
The tetravalent oxygen or sulphur centres, especially in H4 O2+ and H4 S2+ dications, were analysed experimentally and theoretically in various studies. Herein, we discuss stabilities of such centres in related H(CH3 )3 O2+ and H(CH3 )3 S2+ dications mediated by carborane superacid. The ωB97X-D/6-311++G(d,p) calculations were performed for a gas phase and for different solvents characterized by a wide range of dielectric constants for complexes of these dications with the conjugated base of H(CHB11 F11 ) carborane superacid, CHB11 F11 - , which indicate that these complexes are linked by hydrogen bonds. The Quantum Theory of 'Atoms in Molecules' (QTAIM) approach is applied to characterize these interactions. DFT results show that tetravalent oxygen and sulphur structures are additionally stabilized by polar solvents.
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Affiliation(s)
- Sławomir J Grabowski
- Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU), P.K. 1072, 20080, Donostia, Euskadi, Spain.,Donostia International Physics Center (DIPC), 20018, Donostia, Euskadi, Spain.,IKERBASQUE, Basque Foundation for Science, 48011, Bilbo, Euskadi, Spain
| | - David Casanova
- Donostia International Physics Center (DIPC), 20018, Donostia, Euskadi, Spain.,IKERBASQUE, Basque Foundation for Science, 48011, Bilbo, Euskadi, Spain
| | - Elena Formoso
- Donostia International Physics Center (DIPC), 20018, Donostia, Euskadi, Spain.,Farmazia Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU), 01006, Vitoria-Gasteiz, Euskaldi, Spain
| | - Jesus M Ugalde
- Kimika Fakultatea, Euskal Herriko Unibertsitatea (UPV/EHU), P.K. 1072, 20080, Donostia, Euskadi, Spain.,Donostia International Physics Center (DIPC), 20018, Donostia, Euskadi, Spain
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Pollak D, Goddard R, Pörschke KR. Cs[H2NB2(C6F5)6] Featuring an Unequivocal 16-Coordinate Cation. J Am Chem Soc 2016; 138:9444-51. [DOI: 10.1021/jacs.6b02590] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- David Pollak
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz
1, 45470 Mülheim
an der Ruhr, Germany
| | - Richard Goddard
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz
1, 45470 Mülheim
an der Ruhr, Germany
| | - Klaus-Richard Pörschke
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz
1, 45470 Mülheim
an der Ruhr, Germany
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Knorr A, Ludwig R. Cation-cation clusters in ionic liquids: Cooperative hydrogen bonding overcomes like-charge repulsion. Sci Rep 2015; 5:17505. [PMID: 26626928 PMCID: PMC4667241 DOI: 10.1038/srep17505] [Citation(s) in RCA: 88] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Accepted: 10/28/2015] [Indexed: 12/27/2022] Open
Abstract
Direct spectroscopic evidence for H-bonding between like-charged ions is reported for the ionic liquid, 1-(2-hydroxyethyl)-3-methylimidazolium tetrafluoroborate. New infrared bands in the OH frequency range appear at low temperatures indicating the formation of H-bonded cation-cation clusters similar to those known for water and alcohols. Supported by DFT calculations, these vibrational bands can be assigned to attractive interaction between the hydroxyl groups of the cations. The repulsive Coulomb interaction is overcome by cooperative hydrogen bonding between ions of like charge. The transition energy from purely cation-anion interacting configurations to those including cation-cation H-bonds is determined to be 3-4 kJmol(-1). The experimental findings and DFT calculations strongly support the concept of anti-electrostatic hydrogen bonds (AEHBs) as recently suggested by Weinhold and Klein. The like-charge configurations are kinetically stabilized with decreasing temperatures.
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Affiliation(s)
- Anne Knorr
- Universität Rostock, Institut für Chemie, Abteilung für Physikalische Chemie, Dr.-Lorenz-Weg 1, 18059, Rostock (Germany)
| | - Ralf Ludwig
- Universität Rostock, Institut für Chemie, Abteilung für Physikalische Chemie, Dr.-Lorenz-Weg 1, 18059, Rostock (Germany)
- Leibniz-Institut für Katalyse an der Universität Rostock e.V., Albert-Einstein-Str. 29a, 18059 Rostock (Germany)
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Cebollada A, Vellé A, Iglesias M, Fullmer LB, Goberna-Ferrón S, Nyman M, Sanz Miguel PJ. Direct X-Ray Scattering Evidence for Metal-Metal Interactions in Solution at the Molecular Level. Angew Chem Int Ed Engl 2015; 54:12762-6. [DOI: 10.1002/anie.201505736] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Revised: 07/20/2015] [Indexed: 11/05/2022]
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Cebollada A, Vellé A, Iglesias M, Fullmer LB, Goberna-Ferrón S, Nyman M, Sanz Miguel PJ. Direct X-Ray Scattering Evidence for Metal-Metal Interactions in Solution at the Molecular Level. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201505736] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Knorr A, Fumino K, Bonsa AM, Ludwig R. Spectroscopic evidence of ‘jumping and pecking’ of cholinium and H-bond enhanced cation–cation interaction in ionic liquids. Phys Chem Chem Phys 2015; 17:30978-82. [DOI: 10.1039/c5cp03412d] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Spectroscopic evidence for cation–cation interaction in ionic liquids. The repulsive electrostatic interaction is overcome by hydrogen bonding between ions of like charge.
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Affiliation(s)
- Anne Knorr
- Universität Rostock
- Institut für Chemie
- Abteilung für Physikalische Chemie
- Dr.-Lorenz-Weg 1
- 18059 Rostock
| | - Koichi Fumino
- Universität Rostock
- Institut für Chemie
- Abteilung für Physikalische Chemie
- Dr.-Lorenz-Weg 1
- 18059 Rostock
| | - Anne-Marie Bonsa
- Universität Rostock
- Institut für Chemie
- Abteilung für Physikalische Chemie
- Dr.-Lorenz-Weg 1
- 18059 Rostock
| | - Ralf Ludwig
- Universität Rostock
- Institut für Chemie
- Abteilung für Physikalische Chemie
- Dr.-Lorenz-Weg 1
- 18059 Rostock
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