1
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Wong LN, Brunner M, Imberti S, Warr GG, Atkin R. Bulk Nanostructure of Mixtures of Choline Arginate, Choline Lysinate, and Water. J Phys Chem B 2024. [PMID: 38691762 DOI: 10.1021/acs.jpcb.4c01482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2024]
Abstract
Neutron diffraction with empirical potential structure refinement was used to investigate the bulk liquid nanostructure of mixtures of choline arginate (Ch[Arg]), choline lysinate (Ch[Lys]), and water at mole ratios of 1Ch[Arg]:1Ch[Lys]:6H2O (balanced), 1Ch[Arg]:1Ch[Lys]:20H2O (balanced dilute), 3Ch[Arg]:1Ch[Lys]:12H2O (Arg- rich), and 1Ch[Arg]:3Ch[Lys]:12H2O (Lys- rich). The Arg- and Lys- anions tend not to associate due to electrostatic repulsion between charge groups and weak anion-anion attractions. This means that the local ion structures around the anions in these mixtures resemble the parent single-component systems. The bulk liquid nanostructure varies with the Arg-:Lys- ratio. In the Lys--rich mixture (1Ch[Arg]:3Ch[Lys]:12H2O), Lys- side chains cluster into a continuous apolar domain separated from a charged domain of polar groups. In the balanced mixture (1Ch[Arg]:1Ch[Lys]:6H2O), Lys- side chains form discrete apolar aggregates within a continuous polar domain of Arg-, Ch+, and water, and in the Arg--rich mixture (3Ch[Arg]:1Ch[Lys]:12H2O), the distribution of Lys- and Arg- is nearly homogeneous. Finally, in the balance dilute system (1Ch[Arg]:1Ch[Lys]:20H2O), a percolating water domain forms.
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Affiliation(s)
- Lucas N Wong
- School of Molecular Sciences, The University of Western Australia, Crawley, WA 6009, Australia
| | - Manuel Brunner
- School of Molecular Sciences, The University of Western Australia, Crawley, WA 6009, Australia
| | - Silvia Imberti
- UKRI, STFC, ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Didcot OX11 0QX, United Kingdom
| | - Gregory G Warr
- School of Chemistry and University of Sydney Nano Institute, The University of Sydney, Sydney, NSW 2006, Australia
| | - Rob Atkin
- School of Molecular Sciences, The University of Western Australia, Crawley, WA 6009, Australia
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2
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Wong LN, Imberti S, Warr GG, Atkin R. Bulk nanostructure of a deep eutectic solvent with an amphiphilic hydrogen bond donor. Phys Chem Chem Phys 2023; 25:31068-31076. [PMID: 37946570 DOI: 10.1039/d3cp03587e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2023]
Abstract
Neutron diffraction with empirical potential structure refinement (EPSR) show the deep eutectic solvent (DES) 1 : 4 choline chloride : butyric acid is amphiphilically nanostructured. Nanostructure results from solvophobic interactions between the alkyl chains of the butyric acid hydrogen bond donor (HBD) and is retained with addition of 10 wt% water. EPSR fits to the diffraction data is used to produce a three-dimensional model of the liquid which is interrogated to reveal the interactions leading to the solvophobic effect, and therefore nanostructure, in this DES at atomic resolution. The model shows electrostatic and hydrogen bond interactions cause the cation, anion and HBD acid group to cluster into a polar domain, from which the acid alkyl chains are solvophobically excluded into theapolar domain. The polar and apolar domains percolate through the liquid in a bicontinuous sponge-like structure. The effect of adding 10 wt% water is probed, revealing that water molecules are sequestered around the cation and anion within the polar domain, while the neat bulk structure is retained. Alkyl chain packing in the apolar domain becomes slightly better-defined indicating water marginally strengthens solvophobic segregation. These findings reveal bulk self-assembled nanostructure can be produced in DESs via an amphiphilic HBD.
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Affiliation(s)
- Lucas N Wong
- School of Molecular Sciences, The University of Western Australia, Crawley, Perth 6009, Australia.
| | - Silvia Imberti
- STFC, ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Didcot OX11 0QX, UK
| | - Gregory G Warr
- School of Chemistry and University of Sydney Nano Institute, The University of Sydney, Sydney, NSW 2006, Australia
| | - Rob Atkin
- School of Molecular Sciences, The University of Western Australia, Crawley, Perth 6009, Australia.
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3
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McGrogan A, Byrne EL, Guiney R, Headen TF, Youngs TGA, Chrobok A, Holbrey JD, Swadźba-Kwaśny M. The structure of protic ionic liquids based on sulfuric acid, doped with excess of sulfuric acid or with water. Phys Chem Chem Phys 2023; 25:9785-9795. [PMID: 36647728 DOI: 10.1039/d2cp04292d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Neutron scattering with isotopic substitution was used to study the structure of concentrated sulfuric acid, and two protic ionic liquids (PILs): a Brønsted-acidic PIL, synthesised using pyridine and excess of sulfuric acid, [Hpy][HSO4]·H2SO4, and a hydrated PIL, in which an equimolar mixture of sulfuric acid and pyridine has been doped with water, [Hpy][HSO4]·2H2O. Brønsted acidic PILs are excellent solvents/catalysts for esterifications, driving reaction to completion by phase-separating water and ester products. Water-doped PILs are efficient solvents/antisolvents in biomass fractionation. This study was carried out to provide an insight into the relationship between the performance of PILs in the two respective processes and their liquid structure. It was found that a persistent sulfate/sulfuric acid/water network structure was retained through the transition from sulfuric acid to PILs, even in the presence of 2 moles (∼17 wt%) of water. Hydrogen sulfate PILs have the propensity to incorporate water into hydrogen-bonded anionic chains, with strong and directional hydrogen bonds, which essentially form a new water-in-salt solvent system, with its own distinct structure and physico-chemical properties. It is the properties of this hydrated PIL that can be credited both for the good performance in esterification and beneficial solvent/antisolvent behaviour in biomass fractionation.
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Affiliation(s)
- Anne McGrogan
- The QUILL Research Centre, School of Chemistry and Chemical Engineering, Queen's University Belfast, Belfast, BT9 5AG, UK.
| | - Emily L Byrne
- The QUILL Research Centre, School of Chemistry and Chemical Engineering, Queen's University Belfast, Belfast, BT9 5AG, UK.
| | - Robert Guiney
- The QUILL Research Centre, School of Chemistry and Chemical Engineering, Queen's University Belfast, Belfast, BT9 5AG, UK.
| | - Thomas F Headen
- Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX, UK
| | | | - Anna Chrobok
- Department of Chemical Organic Technology and Petrochemistry, Silesian University of Technology, Krzywoustego 4, 44-100, Gilwice, Poland
| | - John D Holbrey
- The QUILL Research Centre, School of Chemistry and Chemical Engineering, Queen's University Belfast, Belfast, BT9 5AG, UK.
| | - Małgorzata Swadźba-Kwaśny
- The QUILL Research Centre, School of Chemistry and Chemical Engineering, Queen's University Belfast, Belfast, BT9 5AG, UK.
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4
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Characterising a Protic Ionic Liquid Library with Applied Machine Learning Algorithms. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.120453] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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5
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Biswas A, Mallik BS. Multiple Ensembles of the Hydrogen-bonded Network in Ethylammonium Nitrate versus Water from Vibrational Spectral Dynamics of SCN- Probe. Chemphyschem 2022; 23:e202200497. [PMID: 35965410 DOI: 10.1002/cphc.202200497] [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: 07/11/2022] [Revised: 08/05/2022] [Indexed: 11/12/2022]
Abstract
We performed classical molecular dynamics simulations to monitor the structural interactions and ultrafast dynamical and spectral response in the protic ionic liquid, ethylammonium nitrate (EAN) and water using the nitrile stretching mode of thiocyanate ion (SCN-) as the vibrational probe. The normalized stretch frequency distribution of nitrile stretch of SCN- attains an asymmetric shape in EAN, indicating the existence of more than one hydrogen-bonding environment in EAN. We computed the 2D IR spectrum from classical trajectories, applying the response function formalism. Spectral diffusion dynamics in EAN undergo an initial rattling of the SCN - inside the local ion-cage occurring at a timescale of 0.10 ps, followed by the breakup of the ion-cage activating molecular diffusion at 7.86 ps timescale. In contrast, the dynamics of structural reorganization occur at a timescale of 0.58 ps in H 2 O. Hence, the time dependence of the frequency-frequency correlation function decay hints at the local molecular structure and ultrafast ion dynamics of the SCN - probe. The loss of frequency correlation read from the peak shape changes in the 2D correlation spectrum as a function of waiting time is faster in H 2 O than in EAN due to the enhanced structural ordering and higher viscosity of the latter. We provide an atomic-level interpretation of the solvation environment around SCN - in EAN and water, which indicates the multiple ensembles of the hydrogen bond network in EAN.
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Affiliation(s)
- Aritri Biswas
- IITH: Indian Institute of Technology Hyderabad, Chemistry, INDIA
| | - Bhabani S Mallik
- IITH: Indian Institute of Technology Hyderabad, Chemistry, Kandi, 502285, Sangareddy, INDIA
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6
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Shmukler LE, Fedorova IV, Fadeeva Y, Gruzdev MS, Safonova LP. Alkylimidazolium Protic Ionic Liquids: Structural Features and Physicochemical Properties. Chemphyschem 2021; 23:e202100772. [PMID: 34904777 DOI: 10.1002/cphc.202100772] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 12/04/2021] [Indexed: 11/08/2022]
Abstract
We focus on a series of protic ionic liquids (PILs) with imidazolium and alkylimidazolium (1R3HIm, R = methyl, ethyl, propyl, and butyl) cations. Using the literature data and our experimental results on the thermal and transport properties, we analyze the effects of the anion nature and the alkyl radical length in the cation structure on the above properties. DFT calculations in gas and solvent phase have resulted in microscopic insights into the structure and cation-anion binding in these PILs. We show that the higher thermodynamic stability of an ion pair raises the PIL decomposition temperature. The melting points of the salts with the same cation decrease as the hydrocarbon radical in the cation becomes longer, which correlates with the weaker ion-ion interaction in the ion pairs. A comparative analysis of the protic ILs and corresponding ILs (1R3MeIm) with the same radical (R) in the cation structure and the same anion has been performed. The lower melting points of the ILs with 1R3MeIm cations are assumed to result from the weakening both of the ion-ion interaction and hydrogen bond.
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Affiliation(s)
- Liudmila E Shmukler
- G A Krestov Institute of Solution Chemistry Russian Academy of Sciences: Institut himii rastvorov imeni G A Krestova Rossijskoj akademii nauk, laboratory 1-8, RUSSIAN FEDERATION
| | - Irina V Fedorova
- G A Krestov Institute of Solution Chemistry Russian Academy of Sciences: Institut himii rastvorov imeni G A Krestova Rossijskoj akademii nauk, laboratory 1-8, RUSSIAN FEDERATION
| | - Yuliya Fadeeva
- G A Krestov Institute of Solution Chemistry Russian Academy of Sciences: Institut himii rastvorov imeni G A Krestova Rossijskoj akademii nauk, laboratory 1-8, Akademicheskaya, 1, 153045, Ivanovo, RUSSIAN FEDERATION
| | - Matvey S Gruzdev
- G A Krestov Institute of Solution Chemistry Russian Academy of Sciences: Institut himii rastvorov imeni G A Krestova Rossijskoj akademii nauk, laboratory 1-8, RUSSIAN FEDERATION
| | - Liubov P Safonova
- G A Krestov Institute of Solution Chemistry Russian Academy of Sciences: Institut himii rastvorov imeni G A Krestova Rossijskoj akademii nauk, laboratory 1-8, RUSSIAN FEDERATION
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7
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Solvatochromic probes behaviour within ternary room temperature 1-butyl-3-methyl imidazolium tetrafluoroborate + methanol + water solutions. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.117767] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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8
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Andreev IA, Ratmanova NK, Augustin AU, Ivanova OA, Levina II, Khrustalev VN, Werz DB, Trushkov IV. Protic Ionic Liquid as Reagent, Catalyst, and Solvent: 1-Methylimidazolium Thiocyanate. Angew Chem Int Ed Engl 2021; 60:7927-7934. [PMID: 33433034 PMCID: PMC8048580 DOI: 10.1002/anie.202016593] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Indexed: 02/06/2023]
Abstract
We propose a new concept of the triple role of protic ionic liquids with nucleophilic anions: a) a regenerable solvent, b) a Brønsted acid inducing diverse transformations via general acid catalysis, and c) a source of a nucleophile. The efficiency of this strategy was demonstrated using thiocyanate-based protic ionic liquids for the ring-opening of donor-acceptor cyclopropanes. A wide variety of activated cyclopropanes were found to react with 1-methylimidazolium thiocyanate under mild metal-free conditions via unusual nitrogen attack of the ambident thiocyanate ion on the electrophilic center of the three-membered ring affording pyrrolidine-2-thiones bearing donor and acceptor substituents at the C(5) and C(3) atoms, respectively, in a single time-efficient step. The ability of 1-methylimidazolium thiocyanate to serve as a triplex reagent was exemplarily illustrated by (4+2)-annulation with 1-acyl-2-(2-hydroxyphenyl)cyclopropane, epoxide ring-opening and other organic transformations.
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Affiliation(s)
- Ivan A. Andreev
- Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and ImmunologySamory Mashela 1117997MoscowRussian Federation
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of SciencesLeninsky pr. 47119991MoscowRussian Federation
| | - Nina K. Ratmanova
- Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and ImmunologySamory Mashela 1117997MoscowRussian Federation
| | - André U. Augustin
- Technische Universität BraunschweigInstitute of Organic ChemistryHagenring 3038106BraunschweigGermany
| | - Olga A. Ivanova
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of SciencesLeninsky pr. 47119991MoscowRussian Federation
- Department of ChemistryLomonosov Moscow State UniversityLeninskie Gory 1–3119991MoscowRussian Federation
| | - Irina I. Levina
- Institute of Biochemical PhysicsRussian Academy of SciencesKosygina 4119334MoscowRussian Federation
| | - Victor N. Khrustalev
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of SciencesLeninsky pr. 47119991MoscowRussian Federation
- Faculty of ScienceRUDN UniversityMiklukho-Maklaya 6117198MoscowRussian Federation
| | - Daniel B. Werz
- Technische Universität BraunschweigInstitute of Organic ChemistryHagenring 3038106BraunschweigGermany
| | - Igor V. Trushkov
- Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and ImmunologySamory Mashela 1117997MoscowRussian Federation
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of SciencesLeninsky pr. 47119991MoscowRussian Federation
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9
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Andreev IA, Ratmanova NK, Augustin AU, Ivanova OA, Levina II, Khrustalev VN, Werz DB, Trushkov IV. Protic Ionic Liquid as Reagent, Catalyst, and Solvent: 1‐Methylimidazolium Thiocyanate. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202016593] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Ivan A. Andreev
- Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and Immunology Samory Mashela 1 117997 Moscow Russian Federation
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences Leninsky pr. 47 119991 Moscow Russian Federation
| | - Nina K. Ratmanova
- Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and Immunology Samory Mashela 1 117997 Moscow Russian Federation
| | - André U. Augustin
- Technische Universität Braunschweig Institute of Organic Chemistry Hagenring 30 38106 Braunschweig Germany
| | - Olga A. Ivanova
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences Leninsky pr. 47 119991 Moscow Russian Federation
- Department of Chemistry Lomonosov Moscow State University Leninskie Gory 1–3 119991 Moscow Russian Federation
| | - Irina I. Levina
- Institute of Biochemical Physics Russian Academy of Sciences Kosygina 4 119334 Moscow Russian Federation
| | - Victor N. Khrustalev
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences Leninsky pr. 47 119991 Moscow Russian Federation
- Faculty of Science RUDN University Miklukho-Maklaya 6 117198 Moscow Russian Federation
| | - Daniel B. Werz
- Technische Universität Braunschweig Institute of Organic Chemistry Hagenring 30 38106 Braunschweig Germany
| | - Igor V. Trushkov
- Dmitry Rogachev National Medical Research Center of Pediatric Hematology, Oncology and Immunology Samory Mashela 1 117997 Moscow Russian Federation
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences Leninsky pr. 47 119991 Moscow Russian Federation
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Wang YL, Li B, Sarman S, Mocci F, Lu ZY, Yuan J, Laaksonen A, Fayer MD. Microstructural and Dynamical Heterogeneities in Ionic Liquids. Chem Rev 2020; 120:5798-5877. [PMID: 32292036 PMCID: PMC7349628 DOI: 10.1021/acs.chemrev.9b00693] [Citation(s) in RCA: 192] [Impact Index Per Article: 48.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Indexed: 12/11/2022]
Abstract
Ionic liquids (ILs) are a special category of molten salts solely composed of ions with varied molecular symmetry and charge delocalization. The versatility in combining varied cation-anion moieties and in functionalizing ions with different atoms and molecular groups contributes to their peculiar interactions ranging from weak isotropic associations to strong, specific, and anisotropic forces. A delicate interplay among intra- and intermolecular interactions facilitates the formation of heterogeneous microstructures and liquid morphologies, which further contributes to their striking dynamical properties. Microstructural and dynamical heterogeneities of ILs lead to their multifaceted properties described by an inherent designer feature, which makes ILs important candidates for novel solvents, electrolytes, and functional materials in academia and industrial applications. Due to a massive number of combinations of ion pairs with ion species having distinct molecular structures and IL mixtures containing varied molecular solvents, a comprehensive understanding of their hierarchical structural and dynamical quantities is of great significance for a rational selection of ILs with appropriate properties and thereafter advancing their macroscopic functionalities in applications. In this review, we comprehensively trace recent advances in understanding delicate interplay of strong and weak interactions that underpin their complex phase behaviors with a particular emphasis on understanding heterogeneous microstructures and dynamics of ILs in bulk liquids, in mixtures with cosolvents, and in interfacial regions.
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Affiliation(s)
- Yong-Lei Wang
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Bin Li
- School
of Chemical Engineering and Technology, Sun Yat-sen University, Zhuhai 519082, P. R. China
| | - Sten Sarman
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Francesca Mocci
- Department
of Chemical and Geological Sciences, University
of Cagliari, I-09042 Monserrato, Italy
| | - Zhong-Yuan Lu
- State
Key Laboratory of Supramolecular Structure and Materials, Institute
of Theoretical Chemistry, Jilin University, Changchun 130021, P. R. China
| | - Jiayin Yuan
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Aatto Laaksonen
- Department
of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
- State
Key Laboratory of Materials-Oriented and Chemical Engineering, Nanjing Tech University, Nanjing 210009, P. R. China
- Centre of
Advanced Research in Bionanoconjugates and Biopolymers, Petru Poni Institute of Macromolecular Chemistry Aleea Grigore Ghica-Voda, 41A, 700487 Iasi, Romania
- Department
of Engineering Sciences and Mathematics, Division of Energy Science, Luleå University of Technology, SE-97187 Luleå, Sweden
| | - Michael D. Fayer
- Department
of Chemistry, Stanford University, Stanford, California 94305, United States
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Kanzaki R, Kodamatani H, Tomiyasu T. Proton Thermodynamics in a Protic Ionic Liquid, Ethylammonium Nitrate. Chemistry 2019; 25:13500-13503. [PMID: 31454440 DOI: 10.1002/chem.201903485] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Indexed: 11/11/2022]
Abstract
In order to investigate the proton solvation state in protic ionic liquids (PILs), ten acid dissociation enthalpies and entropies of eight compounds were determined in ethylammonium nitrate (EAN). Regardless of the nature of the compound, 24 kJ mol-1 larger enthalpy and 65 J mol-1 K-1 larger entropy than those in water, respectively, were observed. These values were reasonably explained by the differences in the proton solvation structure in EAN and water. Namely, protons in EAN exist as HNO3 , having a higher reaction energy than that of H3 O+ in water, undergo entropic stabilization as a result of the less-structured solvation. As such, the entropic effect of the proton solvation structure on the acid-base property is possibly applicable to all PILs. In addition, based on these proton thermodynamics, enthalpy and entropy windows were proposed as a novel perspective for the characterization of solvents. Use of this concept enabled the visualization of similarities and differences between EAN and water.
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Affiliation(s)
- Ryo Kanzaki
- Graduate School of Science and Engineering, Kagoshima University, 1-21-35, Korimoto, Kagoshima, 890-0065, Japan
| | - Hitoshi Kodamatani
- Graduate School of Science and Engineering, Kagoshima University, 1-21-35, Korimoto, Kagoshima, 890-0065, Japan
| | - Takashi Tomiyasu
- Graduate School of Science and Engineering, Kagoshima University, 1-21-35, Korimoto, Kagoshima, 890-0065, Japan
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12
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Niemann T, Neumann J, Stange P, Gärtner S, Youngs TGA, Paschek D, Warr GG, Atkin R, Ludwig R. Die zweigesichtige Natur der Wasserstoffbrückenbindung in hydroxylfunktionalisierten ionischen Flüssigkeiten, offenbart durch Neutronendiffraktometrie und Molekulardynamik‐Simulation. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201904712] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Thomas Niemann
- Universität Rostock Institut für Chemie Abteilung für Physikalische Chemie Dr.-Lorenz-Weg 2 18059 Rostock Deutschland
| | - Jan Neumann
- Universität Rostock Institut für Chemie Abteilung für Physikalische Chemie Albert-Einstein-Str. 21 18059 Rostock Deutschland
| | - Peter Stange
- Universität Rostock Institut für Chemie Abteilung für Physikalische Chemie Dr.-Lorenz-Weg 2 18059 Rostock Deutschland
| | - Sabrina Gärtner
- ISIS Faculty, STFC Rutherford Appleton Laboratory Didcot OX11 0QX UK
| | | | - Dietmar Paschek
- Universität Rostock Institut für Chemie Abteilung für Physikalische Chemie Albert-Einstein-Str. 21 18059 Rostock Deutschland
| | - Gregory G. Warr
- School of Chemistry and Sydney Nano The University of Sydney NSW 2006 Australien
| | - Rob Atkin
- School of Molecular Sciences The University of Western Australia Perth Western Australia 6009 Australien
| | - Ralf Ludwig
- Universität Rostock Institut für Chemie Abteilung für Physikalische Chemie Dr.-Lorenz-Weg 2 18059 Rostock Deutschland
- Department LL&M University of Rostock Albert-Einstein-Str. 25 18059 Rostock Deutschland
- Leibniz-Institut für Katalyse an der Universität Rostock e.V. Albert-Einstein-Str. 29a 18059 Rostock Deutschland
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13
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Niemann T, Neumann J, Stange P, Gärtner S, Youngs TGA, Paschek D, Warr GG, Atkin R, Ludwig R. The Double-Faced Nature of Hydrogen Bonding in Hydroxy-Functionalized Ionic Liquids Shown by Neutron Diffraction and Molecular Dynamics Simulations. Angew Chem Int Ed Engl 2019; 58:12887-12892. [PMID: 31177605 DOI: 10.1002/anie.201904712] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Revised: 05/25/2019] [Indexed: 01/14/2023]
Abstract
We characterize the double-faced nature of hydrogen bonding in hydroxy-functionalized ionic liquids by means of neutron diffraction with isotopic substitution (NDIS), molecular dynamics (MD) simulations, and quantum chemical calculations. NDIS data are fit using the empirical potential structure refinement technique (EPSR) to elucidate the nearest neighbor H⋅⋅⋅O and O⋅⋅⋅O pair distribution functions for hydrogen bonds between ions of opposite charge and the same charge. Despite the presence of repulsive Coulomb forces, the cation-cation interaction is stronger than the cation-anion interaction. We compare the hydrogen-bond geometries of both "doubly charged hydrogen bonds" with those reported for molecular liquids, such as water and alcohols. In combination, the NDIS measurements and MD simulations reveal the subtle balance between the two types of hydrogen bonds: The small transition enthalpy suggests that the elusive like-charge attraction is almost competitive with conventional ion-pair formation.
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Affiliation(s)
- Thomas Niemann
- Universität Rostock, Institut für Chemie, Abteilung für Physikalische Chemie, Dr.-Lorenz-Weg 2, 18059, Rostock, Germany
| | - Jan Neumann
- Universität Rostock, Institut für Chemie, Abteilung für Physikalische Chemie, Albert-Einstein-Strasse 21, 18059, Rostock, Germany
| | - Peter Stange
- Universität Rostock, Institut für Chemie, Abteilung für Physikalische Chemie, Dr.-Lorenz-Weg 2, 18059, Rostock, Germany
| | - Sabrina Gärtner
- ISIS Faculty, STFC, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Tristan G A Youngs
- ISIS Faculty, STFC, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Dietmar Paschek
- Universität Rostock, Institut für Chemie, Abteilung für Physikalische Chemie, Albert-Einstein-Strasse 21, 18059, Rostock, Germany
| | - Gregory G Warr
- School of Chemistry and Sydney Nano, The University of Sydney, NSW, 2006, Australia
| | - Rob Atkin
- School of Molecular Sciences, The University of Western Australia, Perth, Western Australia, 6009, Australia
| | - Ralf Ludwig
- Universität Rostock, Institut für Chemie, Abteilung für Physikalische Chemie, Dr.-Lorenz-Weg 2, 18059, Rostock, Germany.,Department LL&M, University of Rostock, Albert-Einstein-Strasse 25, 18059, Rostock, Germany.,Leibniz-Institut für Katalyse an der, Universität Rostock e.V., Albert-Einstein-Strasse 29a, 18059, Rostock, Germany
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14
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Jiang HJ, Imberti S, Simmons BA, Atkin R, Warr GG. Structural Design of Ionic Liquids for Optimizing Aromatic Dissolution. CHEMSUSCHEM 2019; 12:270-274. [PMID: 30300962 DOI: 10.1002/cssc.201802016] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2018] [Revised: 10/03/2018] [Indexed: 06/08/2023]
Abstract
Certain protic ionic liquids (PILs) are potentially low-cost, high-efficiency solvents for the extraction and processing of aromatic compounds. To understand the key design features of PILs that determine solubility selectivity at the atomic level, neutron diffraction was used to compare the bulk structure of two PILs with and without an aromatic solute, guaiacol (2-methoxyphenol). Guaiacol is a common lignin residue in biomass processing, and a model compound for anisole- or phenol-based food additives and drug precursors. Although the presence of amphiphilic nanostructure is important to facilitate the dissolution of solute nonpolar moieties, the local geometry and competitive interactions between the polar groups of the cation, anion, and solute are found to also strongly influence solvation. Based on these factors, a framework is presented for the design of PIL structure to minimize competition and to enhance driving forces for the dissolution of small aromatic species.
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Affiliation(s)
- Haihui Joy Jiang
- School of Chemistry and Sydney Nano Institute, The University of Sydney, NSW, 2006, Australia
| | - Silvia Imberti
- STFC, Rutherford Appleton Laboratory, Didcot, OX11 0QX, UK
| | - Blake A Simmons
- Biological Systems and Engineering Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Rd., Berkeley, CA, 94720, USA
- Deconstruction Division, Joint BioEnergy Institute, 5885 Hollis St., Emeryville, CA, 94608, USA
| | - Rob Atkin
- School of Molecular Sciences, The University of Western Australia, 35 Stirling Hwy, WA, 6009, Australia
| | - Gregory G Warr
- School of Chemistry and Sydney Nano Institute, The University of Sydney, NSW, 2006, Australia
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15
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Feng L, Ye R, Yuan T, Zhang X, Lu GP, Zhou B. A concerted addition mechanism in [Hmim]Br-triggered thiol–ene reactions: a typical “ionic liquid effect” revealed by DFT and experimental studies. NEW J CHEM 2019. [DOI: 10.1039/c8nj05674a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The π+–π and H-bond interactions between [Hmim]Br and substrates promote a special one-step addition mechanism in thiol–ene reactions.
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Affiliation(s)
- Lin Feng
- Chemical Engineering College
- Nanjing University of Science & Technology Xiaolingwei 200
- Nanjing
- China
| | - Renlong Ye
- Chemical Engineering College
- Nanjing University of Science & Technology Xiaolingwei 200
- Nanjing
- China
| | - Tao Yuan
- Chemical Engineering College
- Nanjing University of Science & Technology Xiaolingwei 200
- Nanjing
- China
| | - Xiao Zhang
- Chemical Engineering College
- Nanjing University of Science & Technology Xiaolingwei 200
- Nanjing
- China
| | - Guo-ping Lu
- Chemical Engineering College
- Nanjing University of Science & Technology Xiaolingwei 200
- Nanjing
- China
| | - Baojing Zhou
- Chemical Engineering College
- Nanjing University of Science & Technology Xiaolingwei 200
- Nanjing
- China
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16
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Configurational effect on ion-pair interaction energies and intermolecular potential energy functions in imidazolium-based ionic liquids: A theoretical study. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.04.105] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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17
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Zheng YZ, Chen DF, Zhou Y, Guo R, Liang Q, Fu ZM. Hydrogen-bonding interactions between 1-butyl-2,3-dimethylimidazolium tetrafluoroborate and dimethyl sulphoxide. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.03.042] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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18
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Nasrabadi AT, Gelb LD. How Proton Transfer Equilibria Influence Ionic Liquid Properties: Molecular Simulations of Alkylammonium Acetates. J Phys Chem B 2018; 122:5961-5971. [DOI: 10.1021/acs.jpcb.8b01631] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Amir Taghavi Nasrabadi
- Department of Materials Science and Engineering, University of Texas at Dallas, Richardson, Texas 75080, United States
| | - Lev D. Gelb
- Department of Materials Science and Engineering, University of Texas at Dallas, Richardson, Texas 75080, United States
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19
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Panda S, Kundu K, Umapathy S, Gardas RL. A Combined Experimental and Theoretical Approach to Understand the Structure and Properties ofN-Methylpyrrolidone-Based Protic Ionic Liquids. Chemphyschem 2017; 18:3416-3428. [DOI: 10.1002/cphc.201700886] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2017] [Revised: 09/17/2017] [Indexed: 12/23/2022]
Affiliation(s)
- Somenath Panda
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600036 India
| | - Kaushik Kundu
- Department of Inorganic and Physical Chemistry; Indian Institute of Science; Bangalore 560012 India
| | - Siva Umapathy
- Department of Inorganic and Physical Chemistry; Indian Institute of Science; Bangalore 560012 India
| | - Ramesh L. Gardas
- Department of Chemistry; Indian Institute of Technology Madras; Chennai 600036 India
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20
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Kachmar A, Carignano M, Laino T, Iannuzzi M, Hutter J. Mapping the Free Energy of Lithium Solvation in the Protic Ionic Liquid Ethylammonuim Nitrate: A Metadynamics Study. CHEMSUSCHEM 2017; 10:3083-3090. [PMID: 28547888 DOI: 10.1002/cssc.201700510] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2017] [Revised: 05/23/2017] [Indexed: 06/07/2023]
Abstract
Understanding lithium solvation and transport in ionic liquids is important due to their possible application in electrochemical devices. Using first-principles simulations aided by a metadynamics approach we study the free-energy landscape for lithium ions at infinite dilution in ethylammonium nitrate, a protic ionic liquid. We analyze the local structure of the liquid around the lithium cation and obtain a quantitative picture in agreement with experimental findings. Our simulations show that the lowest two free energy minima correspond to conformations with the lithium ion being solvated either by three or four nitrate ions with a transition barrier between them of 0.2 eV. Other less probable conformations having different solvation pattern are also investigated.
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Affiliation(s)
- Ali Kachmar
- Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University, Qatar Foundation, Doha, Qatar
| | - Marcelo Carignano
- Qatar Environment and Energy Research Institute, Hamad Bin Khalifa University, Qatar Foundation, Doha, Qatar
| | - Teodoro Laino
- Industry Solutions and Cognitive Computing, IBM Zurich Research Laboratory, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
| | - Marcella Iannuzzi
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
| | - Jürg Hutter
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057, Zurich, Switzerland
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21
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Russina O, Lo Celso F, Plechkova N, Jafta CJ, Appetecchi GB, Triolo A. Mesoscopic organization in ionic liquids. Top Curr Chem (Cham) 2017; 375:58. [PMID: 28516337 DOI: 10.1007/s41061-017-0147-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Accepted: 05/08/2017] [Indexed: 01/24/2023]
Abstract
We discuss some published results and provide new observations concerning the high level of structural complexity that lies behind the nanoscale correlations in ionic liquids (ILs) and their mixtures with molecular liquids. It turns out that this organization is a consequence of the hierarchical construction on both spatial (from ångström to several nanometer) and temporal (from fraction of picosecond to hundreds of nanosecond) scales, which requires joint use of experimental and computational tools.
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Affiliation(s)
- Olga Russina
- Dipartimento di Chimica, Università di Roma Sapienza, Rome, Italy
| | - Fabrizio Lo Celso
- Dipartimento di Fisica e Chimica, Università di Palermo, Palermo, Italy
| | - Natalia Plechkova
- QUILL, The Queen's University of Belfast, Stranmillis Road, Belfast, Northern Ireland, UK
| | - Charl J Jafta
- Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, Berlin, Germany
| | | | - Alessandro Triolo
- Laboratorio Liquidi Ionici, Istituto Struttura della Materia, Consiglio Nazionale delle Ricerche, Rome, Italy.
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22
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Serva A, Migliorati V, Spezia R, D'Angelo P. How Does CeIII
Nitrate Dissolve in a Protic Ionic Liquid? A Combined Molecular Dynamics and EXAFS Study. Chemistry 2017; 23:8424-8433. [DOI: 10.1002/chem.201604889] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Alessandra Serva
- Dipartimento di Chimica; Università di Roma “La Sapienza”; P. le A. Moro 5 00185 Roma Italy
| | - Valentina Migliorati
- Dipartimento di Chimica; Università di Roma “La Sapienza”; P. le A. Moro 5 00185 Roma Italy
| | - Riccardo Spezia
- LAMBE CEA, CNRS; Université Paris Saclay; 91025 Evry Cedex France
- LAMBE Université d'Evry; 91025 Evry Cedex France
| | - Paola D'Angelo
- Dipartimento di Chimica; Università di Roma “La Sapienza”; P. le A. Moro 5 00185 Roma Italy
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23
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Zhang Y, Duan Y, Liu J. Time-dependent density functional theory study on the excited-state hydrogen-bonding characteristics of polyaniline in aqueous environment. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 171:305-310. [PMID: 27566915 DOI: 10.1016/j.saa.2016.08.039] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Revised: 08/13/2016] [Accepted: 08/18/2016] [Indexed: 06/06/2023]
Abstract
A theoretical study was carried out to study the excited-state of hydrogen-bonding characteristics of polyaniline (PANI) in aqueous environment. The hydrogen-bonded PANI-H2O complexes were studied using first-principles calculations based on density functional theory (DFT). The electronic excitation energies and the corresponding oscillator strengths of the low-lying electronically excited states for hydrogen-bonded complexes were calculated by time-dependent density functional theory (TDDFT). The ground-state geometric structures were optimized, and it is observed that the intermolecular hydrogen bonds CN⋯HO and NH⋯OH were formed in PANI-H2O complexes. The formed hydrogen bonds influenced the bond lengths, the charge distribution, as well as the spectral characters of the groups involved. It was concluded that all the hydrogen-bonded PANI-H2O complexes were primarily excited to the S1 states with the largest oscillator strength. In addition, the orbital transition from the highest occupied molecular orbital (HOMO) to the lowest unoccupied molecular orbital (LUMO) involved intramolecular charge redistribution resulting to increase the electron density of the quinonoid rings.
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Affiliation(s)
- Yahong Zhang
- School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, PR China
| | - Yuping Duan
- School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, PR China.
| | - Jin Liu
- School of Materials Science and Engineering, Dalian University of Technology, Dalian 116085, PR China
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24
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Russina O, Triolo A. Ionic Liquids and Neutron Scattering. NEUTRON SCATTERING - APPLICATIONS IN BIOLOGY, CHEMISTRY, AND MATERIALS SCIENCE 2017. [DOI: 10.1016/b978-0-12-805324-9.00004-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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25
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Kanzaki R, Kodamatani H, Tomiyasu T, Watanabe H, Umebayashi Y. A pH Scale for the Protic Ionic Liquid Ethylammonium Nitrate. Angew Chem Int Ed Engl 2016; 55:6266-9. [DOI: 10.1002/anie.201511328] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Revised: 01/26/2016] [Indexed: 11/05/2022]
Affiliation(s)
- Ryo Kanzaki
- Graduate School of Science and Engineering; Kagoshima University; 1-21-35, Korimoto Kagoshima 890-0065 Japan
| | - Hitoshi Kodamatani
- Graduate School of Science and Engineering; Kagoshima University; 1-21-35, Korimoto Kagoshima 890-0065 Japan
| | - Takashi Tomiyasu
- Graduate School of Science and Engineering; Kagoshima University; 1-21-35, Korimoto Kagoshima 890-0065 Japan
| | - Hikari Watanabe
- Graduate School of Science and Technology; Niigata University; 8050, Ikarashi 2-no-cho, Nishi-ku Niigata 950-2181 Japan
| | - Yasuhiro Umebayashi
- Graduate School of Science and Technology; Niigata University; 8050, Ikarashi 2-no-cho, Nishi-ku Niigata 950-2181 Japan
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26
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Kanzaki R, Kodamatani H, Tomiyasu T, Watanabe H, Umebayashi Y. A pH Scale for the Protic Ionic Liquid Ethylammonium Nitrate. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201511328] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ryo Kanzaki
- Graduate School of Science and Engineering; Kagoshima University; 1-21-35, Korimoto Kagoshima 890-0065 Japan
| | - Hitoshi Kodamatani
- Graduate School of Science and Engineering; Kagoshima University; 1-21-35, Korimoto Kagoshima 890-0065 Japan
| | - Takashi Tomiyasu
- Graduate School of Science and Engineering; Kagoshima University; 1-21-35, Korimoto Kagoshima 890-0065 Japan
| | - Hikari Watanabe
- Graduate School of Science and Technology; Niigata University; 8050, Ikarashi 2-no-cho, Nishi-ku Niigata 950-2181 Japan
| | - Yasuhiro Umebayashi
- Graduate School of Science and Technology; Niigata University; 8050, Ikarashi 2-no-cho, Nishi-ku Niigata 950-2181 Japan
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27
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Cui Y, Yin J, Li C, Li S, Wang A, Yang G, Jia Y. Experimental and theoretical studies on compositions, structures, and IR and NMR spectra of functionalized protic ionic liquids. Phys Chem Chem Phys 2016; 18:19731-7. [DOI: 10.1039/c6cp03293a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
DMCEAP and DMEOAP are composed of neutral and ionized species in the liquid phase as investigated through experimental spectroscopy and DFT calculations.
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Affiliation(s)
- Yingna Cui
- Department of Chemical Engineering
- Dalian University
- Dalian
- China
| | - Jingmei Yin
- Department of Chemical Engineering
- Dalian University
- Dalian
- China
| | - Changping Li
- Department of Chemical Engineering
- Dalian University
- Dalian
- China
| | - Shenmin Li
- Department of Chemical Engineering
- Dalian University
- Dalian
- China
| | - Ailing Wang
- Department of Chemical Engineering
- Dalian University
- Dalian
- China
| | - Guang Yang
- Department of Chemical Engineering
- Dalian University
- Dalian
- China
| | - Yingping Jia
- Department of Chemical Engineering
- Dalian University
- Dalian
- China
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28
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Mariani A, Russina O, Caminiti R, Triolo A. Structural organization in a methanol:ethylammonium nitrate (1:4) mixture: A joint X-ray/Neutron diffraction and computational study. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.10.054] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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29
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Hettige JJ, Araque JC, Margulis CJ. Bicontinuity and Multiple Length Scale Ordering in Triphilic Hydrogen-Bonding Ionic Liquids. J Phys Chem B 2014; 118:12706-16. [DOI: 10.1021/jp5068457] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Jeevapani J. Hettige
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Juan Carlos Araque
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Claudio J. Margulis
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
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30
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Chen L, Mullen GE, Le Roch M, Cassity CG, Gouault N, Fadamiro HY, Barletta RE, O'Brien RA, Sykora RE, Stenson AC, West KN, Horne HE, Hendrich JM, Xiang KR, Davis JH. On the Formation of a Protic Ionic Liquid in Nature. Angew Chem Int Ed Engl 2014; 53:11762-5. [DOI: 10.1002/anie.201404402] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Revised: 06/16/2014] [Indexed: 11/09/2022]
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31
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Chen L, Mullen GE, Le Roch M, Cassity CG, Gouault N, Fadamiro HY, Barletta RE, O'Brien RA, Sykora RE, Stenson AC, West KN, Horne HE, Hendrich JM, Xiang KR, Davis JH. On the Formation of a Protic Ionic Liquid in Nature. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201404402] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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32
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Busch S, Bruce CD, Redfield C, Lorenz CD, McLain SE. Water mediation is essential to nucleation of β-turn formation in peptide folding motifs. Angew Chem Int Ed Engl 2013; 52:13091-5. [PMID: 24130065 PMCID: PMC4227566 DOI: 10.1002/anie.201307657] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2013] [Indexed: 12/05/2022]
Abstract
Water-mediated bond formation: The structure of the peptide GPG-NH2 has been investigated in aqueous solution to understand the role of water in the formation of a β-turn. Using a combination of neutron diffraction enhanced by isotopic substitution, NMR spectroscopy, and computer simulations, it was found that water is an essential component to initiate folding in solution.
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Affiliation(s)
- Sebastian Busch
- Department of Biochemistry, University of Oxford, South Parks Road, Oxford, OX1 3QU (United Kingdom)
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33
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Busch S, Bruce CD, Redfield C, Lorenz CD, McLain SE. Water Mediation Is Essential to Nucleation of β-Turn Formation in Peptide Folding Motifs. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201307657] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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