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Qi J, Zeng H, Gu L, Liu Z, Zeng Y, Hong E, Lai Y, Liu T, Yang C. Electrochemical Preparation of Crystalline Hydrous Iridium Oxide and Its Use in Oxygen Evolution Catalysis. ACS APPLIED MATERIALS & INTERFACES 2023; 15:15269-15278. [PMID: 36930828 DOI: 10.1021/acsami.2c20131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Even the most stable Ir-based oxides inevitably encounter a severe degradation problem during the oxygen evolution reaction (OER) in acid, resulting in quick formation of amorphous IrOx layers on the catalyst surface. Unfortunately, there is still a lack of fundamental understanding of such hydrous IrOx layers, including the atomic arrangement, key active structure, compositions, chemical stability, and so on. In this work, we demonstrate an electrochemical strategy to prepare two types of protonated iridium oxides with well-defined crystalline structures: one possesses a 2D layered structure (denoted as α-HxIrO3) and the other consists of 3D interconnected polymorphs (denoted as β-HxIrO3). Both protonated iridium oxides demonstrate superior electrochemical stabilities with 6 times suppressed Ir dissolution comparing to the initial Li2IrO3 and rutile IrO2. It is hypothesized that the enriched protons and fast diffusions in these two protonated HxIrO3 crystal oxides may promote surface structural stability by suppressing the formation of high-valence Ir species at the solid-liquid interfaces during OER. Overall, the results of this work shed light on the role of proton dynamics toward the OER processes on the catalyst surface in acid media.
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Affiliation(s)
- Jun Qi
- School of Materials, Sun Yat-Sen University, Shenzhen 518107, P. R. China
| | - Huiyan Zeng
- School of Materials, Sun Yat-Sen University, Shenzhen 518107, P. R. China
| | - Long Gu
- School of Materials, Sun Yat-Sen University, Shenzhen 518107, P. R. China
| | - Zhongfei Liu
- School of Materials, Sun Yat-Sen University, Shenzhen 518107, P. R. China
| | - Yanquan Zeng
- School of Materials, Sun Yat-Sen University, Shenzhen 518107, P. R. China
| | - Enna Hong
- School of Materials, Sun Yat-Sen University, Shenzhen 518107, P. R. China
| | - Yuecheng Lai
- School of Materials, Sun Yat-Sen University, Shenzhen 518107, P. R. China
| | - Tianhui Liu
- Synchrotron Radiation Facility Division, Institute of Advanced Science Facilities (IASF), Shenzhen 518108, P. R. China
| | - Chunzhen Yang
- School of Materials, Sun Yat-Sen University, Shenzhen 518107, P. R. China
- Synchrotron Radiation Facility Division, Institute of Advanced Science Facilities (IASF), Shenzhen 518108, P. R. China
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2
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Ahmadi M, Jangizehi A, Seiffert S. Backbone Polarity Tunes Sticker Clustering in Hydrogen-Bonded Supramolecular Polymer Networks. Macromolecules 2022. [DOI: 10.1021/acs.macromol.2c00645] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mostafa Ahmadi
- Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Amir Jangizehi
- Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
| | - Sebastian Seiffert
- Department of Chemistry, Johannes Gutenberg University Mainz, Duesbergweg 10-14, 55128 Mainz, Germany
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3
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Li XM, Wang Y, Mu Y, Liu J, Zeng L, Lan YQ. Superprotonic Conductivity of a Functionalized Metal-Organic Framework at Ambient Conditions. ACS APPLIED MATERIALS & INTERFACES 2022; 14:9264-9271. [PMID: 35138786 DOI: 10.1021/acsami.2c00500] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Seeking fast proton transport pathways at ambient conditions is desirable but challenging. Here, we report a strategy to synthesize a composite material with a polyoxometalate (POM) and an ionic liquid (IL) confined in stable metal-organic framework (MOF) channels through electrostatic interaction. The obtained SO3H-IL-PMo12@MIL-101 possesses fast proton transfer, and its proton conductivity can reach 1.33 × 10-2 S cm-1 at ambient conditions (30 °C, 70% relative humidity (RH)), which is the highest value among the MOF-based proton conductors operated in an ambient environment. Therefore, it has the potential of becoming a room-temperature proton conductor without a humidifier. Importantly, the composite material is further fabricated into a composite membrane for proton-exchange membrane fuel cells (PEMFCs), which can deliver a power density of 0.93 mW cm-2 at 30 °C and 98% RH. This result can lay a fundamental basis for the application of MOF-based proton conductors in the area of electrochemical energy conversion.
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Affiliation(s)
- Xiao-Min Li
- Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Yameng Wang
- Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Yongbiao Mu
- Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Jiang Liu
- Jiangsu Key Laboratory of Biofunctional Materials, School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210023, China
| | - Lin Zeng
- Department of Mechanical and Energy Engineering, Southern University of Science and Technology, Shenzhen 518055, China
- Key Laboratory of Energy Conversion and Storage Technologies (Southern University of Science and Technology), Ministry of Education, Shenzhen 518055, China
| | - Ya-Qian Lan
- School of Chemistry, South China Normal University, Guangzhou 510006, China
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4
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Bao X, Liu M, Wang Z, Dai D, Wang P, Cheng H, Liu Y, Zheng Z, Dai Y, Huang B. Photocatalytic Selective Oxidation of HMF Coupled with H2 Evolution on Flexible Ultrathin g-C3N4 Nanosheets with Enhanced N–H Interaction. ACS Catal 2022. [DOI: 10.1021/acscatal.1c05357] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Xiaolei Bao
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Mu Liu
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Zeyan Wang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Dujuan Dai
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Peng Wang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Hefeng Cheng
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Yuanyuan Liu
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Zhaoke Zheng
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
| | - Ying Dai
- School of Physics, Shandong University, Jinan 250100, China
| | - Baibiao Huang
- State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
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5
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Jain SK, Rawlings D, Antoine S, Segalman RA, Han S. Confinement Promotes Hydrogen Bond Network Formation and Grotthuss Proton Hopping in Ion-Conducting Block Copolymers. Macromolecules 2022. [DOI: 10.1021/acs.macromol.1c01808] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sheetal K. Jain
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Dakota Rawlings
- Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Ségolène Antoine
- Materials Department, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Rachel A. Segalman
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, California 93106, United States
- Materials Department, University of California Santa Barbara, Santa Barbara, California 93106, United States
| | - Songi Han
- Department of Chemical Engineering, University of California Santa Barbara, Santa Barbara, California 93106, United States
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6
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Abstract
A variety of organic cages with different geometries have been developed during the last decade, most of them exhibiting a single cavity. In contrast, the number of organic cages featuring a pair of cavities remains scarce. These structures may pave the way towards novel porous materials with emergent properties and functions.We herein report on rational design of a three-dimensional hexaformyl precursor 1, which exhibits two types of conformers, i.e. Conformer-1 and -2, with different cleft positions and sizes. Aided by molecular dynamics simulations, we select two triamino conformation capturers (denoted CC). Small-sized CC-1 selectively capture Conformer-1 by matching its cleft size, while the large-sized CC-2 is able to match and capture both conformers. This strategy allows the formation of three compounds with twin cavities, which we coin diphane. The self-assembly of diphane units results in superstructures with tunable proton conductivity, which reaches up to 1.37×10-5 S cm-1. The preparation of nanocages with unprecedented architectures may lead to new functions. Here the authors report the self-assembly of organic cages featuring twin cavities; the geometry and pocket size determine the molecular packing and the proton conductivity performance.
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Shah AH, Rana UA, Zhu H, Li J, Vijayaraghavan R, Macfarlane DR, Forsyth M, Siddiqi HM. Study of Proton Transport in Diethylmethylammonium Poly[4-styrenesulfonyl(trifluoromethylsulfonyl)imide]-Based Composite Membranes with Triflic Acid and Diethylmethylamine-Rich Compositions. J Phys Chem B 2021; 125:11005-11016. [PMID: 34570507 DOI: 10.1021/acs.jpcb.1c04399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The study highlights the effect of acid- and base-rich conditions on the proton dynamics of diethylmethylammonium poly[4-styrenesulfonyl(trifluoromethylsulfonyl)imide, [DEMA][PSTFSI], a polymerized protic ionic liquid designed as a polymer electrolyte for nonhumidified polymer electrolyte membrane fuel cells. Different proportions of triflic acid (HTf) and diethylmethylamine (DEMA) were added to the pristine polymer. The thermal analysis of the mixtures revealed that the addition of the base increases the glassy/amorphous nature of the polymer; however, HTf plasticizes the polymer and lowers the Tg value, so that it falls outside of the differential scanning calorimetry-studied temperature range. 50 mol % doping of the HTf contents increases the conductivity upto 0.952 mS cm-1, and 50 mol % DEMA mixture has a conductivity of 0.169 mS cm-1 at 100 °C. Vogel-Tamman-Fulcher fitting of the ionic conductivities of the doped systems suggested that the ionic conductivities are completely decoupled from segmental motion of the polymer. A combination of Fourier transform infrared and static NMR studies demonstrated that HTf-added polymer composites show conduction via Grotthuss and vehicular mechanisms, while DEMA-added polymer composites show predominantly a Grotthuss mechanism by developing the aggregates of proton and added base.
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Affiliation(s)
- Azhar Hussain Shah
- Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan.,Department of Chemistry and the ARC Center of Excellence for Electromaterials Science, Monash University, Clayton 3800, Victoria, Australia
| | - Usman Ali Rana
- Sustainable Energy Technologies (SET) Center, College of Engineering, King Saud University, P.O. Box 800, Riyadh 11421, Saudi Arabia
| | - Haijin Zhu
- Institute for Frontier Materials, Deakin University, Geelong 3216, Victoria, Australia
| | - Jiaye Li
- Department of Chemistry and the ARC Center of Excellence for Electromaterials Science, Monash University, Clayton 3800, Victoria, Australia
| | - R Vijayaraghavan
- Department of Chemistry and the ARC Center of Excellence for Electromaterials Science, Monash University, Clayton 3800, Victoria, Australia
| | - Douglas R Macfarlane
- Department of Chemistry and the ARC Center of Excellence for Electromaterials Science, Monash University, Clayton 3800, Victoria, Australia
| | - Maria Forsyth
- Institute for Frontier Materials, Deakin University, Geelong 3216, Victoria, Australia
| | - Humaira M Siddiqi
- Department of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan
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8
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Asgar MA, Kim J, Haq MR, Kim T, Kim SM. A Comprehensive Review of Micro/Nano Precision Glass Molding Molds and Their Fabrication Methods. MICROMACHINES 2021; 12:mi12070812. [PMID: 34357222 PMCID: PMC8304585 DOI: 10.3390/mi12070812] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/28/2021] [Revised: 07/05/2021] [Accepted: 07/09/2021] [Indexed: 11/16/2022]
Abstract
Micro/nano-precision glass molding (MNPGM) is an efficient approach for manufacturing micro/nanostructured glass components with intricate geometry and a high-quality optical finish. In MNPGM, the mold, which directly imprints the desired pattern on the glass substrate, is a key component. To date, a wide variety of mold inserts have been utilized in MNPGM. The aim of this article is to review the latest advances in molds for MNPGM and their fabrication methods. Surface finishing is specifically addressed because molded glass is usually intended for optical applications in which the surface roughness should be lower than the wavelength of incident light to avoid scattering loss. The use of molds for a wide range of molding temperatures is also discussed in detail. Finally, a series of tables summarizing the mold fabrication methods, mold patterns and their dimensions, anti-adhesion coatings, molding conditions, molding methods, surface roughness values, glass substrates and their glass transition temperatures, and associated applications are presented. This review is intended as a roadmap for those interested in the glass molding field.
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Affiliation(s)
- Md. Ali Asgar
- Department of Computer Science and Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Korea;
| | - Jun Kim
- Department of Mechanical Engineering, Chung-Ang University, 84 Heukseok-dong, Dongjak-gu, Seoul 06974, Korea; (J.K.); (M.R.H.)
| | - Muhammad Refatul Haq
- Department of Mechanical Engineering, Chung-Ang University, 84 Heukseok-dong, Dongjak-gu, Seoul 06974, Korea; (J.K.); (M.R.H.)
| | - Taekyung Kim
- Department of Systems Engineering, University of Texas at Dallas, Richardson, TX 75080, USA
- Correspondence: (T.K.); (S.-m.K.); Tel.: +82-2-820-5877 (S.-m.K.)
| | - Seok-min Kim
- Department of Computer Science and Engineering, Chung-Ang University, 84 Heukseok-ro, Dongjak-gu, Seoul 06974, Korea;
- Department of Mechanical Engineering, Chung-Ang University, 84 Heukseok-dong, Dongjak-gu, Seoul 06974, Korea; (J.K.); (M.R.H.)
- Correspondence: (T.K.); (S.-m.K.); Tel.: +82-2-820-5877 (S.-m.K.)
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9
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Xue W, Deng W, Chen H, Liu R, Taylor JM, Li Y, Wang L, Deng Y, Li W, Wen Y, Wang G, Wan C, Xu G. MOF‐Directed Synthesis of Crystalline Ionic Liquids with Enhanced Proton Conduction. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202010783] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Wen‐Long Xue
- Beijing Key Laboratory for Optical Materials and Photonic Devices Department of Chemistry Capital Normal University Beijing 100048 China
| | - Wei‐Hua Deng
- State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
- University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100049 China
| | - Hui Chen
- Beijing Key Laboratory for Optical Materials and Photonic Devices Department of Chemistry Capital Normal University Beijing 100048 China
| | - Rui‐Heng Liu
- Beijing Key Laboratory for Optical Materials and Photonic Devices Department of Chemistry Capital Normal University Beijing 100048 China
| | - Jared M. Taylor
- Department of chemistry University of Calgary Calgary Alberta T2N1N4 Canada
| | - Yu‐kun Li
- Beijing Key Laboratory for Optical Materials and Photonic Devices Department of Chemistry Capital Normal University Beijing 100048 China
| | - Lu Wang
- Beijing Key Laboratory for Optical Materials and Photonic Devices Department of Chemistry Capital Normal University Beijing 100048 China
| | - Yu‐Heng Deng
- Beijing Key Laboratory for Optical Materials and Photonic Devices Department of Chemistry Capital Normal University Beijing 100048 China
| | - Wen‐Hua Li
- State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
| | - Ying‐Yi Wen
- State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
| | - Guan‐E Wang
- State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
| | - Chong‐Qing Wan
- Beijing Key Laboratory for Optical Materials and Photonic Devices Department of Chemistry Capital Normal University Beijing 100048 China
| | - Gang Xu
- State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
- University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100049 China
- Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou Fujian 350108 China
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10
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Peschel C, Dreßler C, Sebastiani D. ab-Initio Study of Hydrogen Bond Networks in 1,2,3-Triazole Phases. Molecules 2020; 25:E5722. [PMID: 33287426 PMCID: PMC7730418 DOI: 10.3390/molecules25235722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2020] [Revised: 11/28/2020] [Accepted: 12/01/2020] [Indexed: 11/16/2022] Open
Abstract
The research in storage and conversion of energy is an everlasting process. The use of fuel cells is very tempting but up to now there are still several conceptual challenges to overcome. Especially, the requirement of liquid water causes difficulties due to the temperature limit. Therefore, imidazoles and triazoles are increasingly investigated in a manifold of experimental and theoretical publications as they are both very promising in overcoming this problem. Recently, triazoles were found to be superior to imidazoles in proton conduction. An ab-initio molecular dynamics simulation of pure triazole phases for investigating the behavior of both tautomer species of the triazole molecule has never been done. In this work, we investigate the structural and dynamical properties of two different solid phases and the liquid phase at two different temperatures. We are able to show how the distinct tautomers contribute to the mechanism of proton conduction, to compute dynamical properties of the four systems and to suggest a mechanism of reorientation in solid phase.
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Affiliation(s)
| | | | - Daniel Sebastiani
- Institute of Chemistry, Martin-Luther-Universität Halle-Wittenberg, von-Danckelmann-Platz 4, 06120 Halle, Germany; (C.P.); (C.D.)
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11
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Xue W, Deng W, Chen H, Liu R, Taylor JM, Li Y, Wang L, Deng Y, Li W, Wen Y, Wang G, Wan C, Xu G. MOF‐Directed Synthesis of Crystalline Ionic Liquids with Enhanced Proton Conduction. Angew Chem Int Ed Engl 2020; 60:1290-1297. [DOI: 10.1002/anie.202010783] [Citation(s) in RCA: 55] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Indexed: 12/18/2022]
Affiliation(s)
- Wen‐Long Xue
- Beijing Key Laboratory for Optical Materials and Photonic Devices Department of Chemistry Capital Normal University Beijing 100048 China
| | - Wei‐Hua Deng
- State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
- University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100049 China
| | - Hui Chen
- Beijing Key Laboratory for Optical Materials and Photonic Devices Department of Chemistry Capital Normal University Beijing 100048 China
| | - Rui‐Heng Liu
- Beijing Key Laboratory for Optical Materials and Photonic Devices Department of Chemistry Capital Normal University Beijing 100048 China
| | - Jared M. Taylor
- Department of chemistry University of Calgary Calgary Alberta T2N1N4 Canada
| | - Yu‐kun Li
- Beijing Key Laboratory for Optical Materials and Photonic Devices Department of Chemistry Capital Normal University Beijing 100048 China
| | - Lu Wang
- Beijing Key Laboratory for Optical Materials and Photonic Devices Department of Chemistry Capital Normal University Beijing 100048 China
| | - Yu‐Heng Deng
- Beijing Key Laboratory for Optical Materials and Photonic Devices Department of Chemistry Capital Normal University Beijing 100048 China
| | - Wen‐Hua Li
- State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
| | - Ying‐Yi Wen
- State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
| | - Guan‐E Wang
- State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
| | - Chong‐Qing Wan
- Beijing Key Laboratory for Optical Materials and Photonic Devices Department of Chemistry Capital Normal University Beijing 100048 China
| | - Gang Xu
- State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
- University of Chinese Academy of Sciences Chinese Academy of Sciences Beijing 100049 China
- Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou Fujian 350108 China
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12
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Long Z, Atsango AO, Napoli JA, Markland TE, Tuckerman ME. Elucidating the Proton Transport Pathways in Liquid Imidazole with First-Principles Molecular Dynamics. J Phys Chem Lett 2020; 11:6156-6163. [PMID: 32633523 DOI: 10.1021/acs.jpclett.0c01744] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Imidazole is a promising anhydrous proton conductor with a high conductivity comparable to that of water at a similar temperature relative to its melting point. Previous theoretical studies of the mechanism of proton transport in imidazole have relied either on empirical models or on ab initio trajectories that have been too short to draw significant conclusions. Here, we present the results of multiple time-step ab initio molecular dynamics simulations of an excess proton in liquid imidazole reaching 1 ns in total simulation time. We find that the proton transport is dominated by structural diffusion, with the diffusion constant of the proton defect being ∼8 times higher than that of self-diffusion of the imidazole molecules. By using correlation function analysis, we decompose the mechanism for proton transport into a series of first-order processes and show that the proton transport mechanism occurs over three distinct time and length scales. Although the mechanism at intermediate times is dominated by hopping along pseudo-one-dimensional chains, at longer times the overall rate of diffusion is limited by the re-formation of these chains. These results provide a more complete picture of the traditional idealized Grotthuss structural diffusion mechanism.
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Affiliation(s)
- Zhuoran Long
- Department of Chemistry, New York University, New York, New York 10003, United States
| | - Austin O Atsango
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Joseph A Napoli
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Thomas E Markland
- Department of Chemistry, Stanford University, Stanford, California 94305, United States
| | - Mark E Tuckerman
- Department of Chemistry, New York University, New York, New York 10003, United States
- Courant Institute of Mathematical Science, New York University, New York, New York 10012, United States
- NYU-ECNU Center for Computational Chemistry at NYU Shanghai, 3663 Zhongshan Road North, Shanghai 200062, China
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13
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Li W, Guo Z, Jiang L, Zhong L, Li G, Zhang J, Fan K, Gonzalez-Cortes S, Jin K, Xu C, Xiao T, Edwards PP. Facile in situ reductive synthesis of both nitrogen deficient and protonated g-C 3N 4 nanosheets for the synergistic enhancement of visible-light H 2 evolution. Chem Sci 2020; 11:2716-2728. [PMID: 34084330 PMCID: PMC8157536 DOI: 10.1039/c9sc05060d] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Accepted: 01/31/2020] [Indexed: 11/25/2022] Open
Abstract
A new strategy is reported here to synthesize both nitrogen deficient and protonated graphitic carbon nitride (g-C3N4) nanosheets by the conjoint use of NH4Cl as a dynamic gas template together with hypophosphorous acid (H3PO2) as a doping agent. The NH4Cl treatment allows for the scalable production of protonated g-C3N4 nanosheets. With the corresponding co-addition of H3PO2, nitrogen vacancies, accompanied by both additional protons and interstitially-doped phosphorus, are introduced into the g-C3N4 framework, and the electronic bandgap of g-C3N4 nanosheets as well as their optical properties and hydrogen-production performance can be precisely tuned by careful adjustment of the H3PO2 treatment. This conjoint approach thereby results in improved visible-light absorption, enhanced charge-carrier separation and a high H2 evolution rate of 881.7 μmol h-1 achieved over the H3PO2 doped g-C3N4 nanosheets with a corresponding apparent quantum yield (AQY) of 40.4% (at 420 nm). We illustrate that the synergistic H3PO2 doping modifies the layered g-C3N4 materials by introducing nitrogen vacancies as well as protonating them, leading to significant photocatalytic H2 evolution enhancements, while the g-C3N4 materials doped with phosphoric acid (H3PO4) are simply protonated further, revealing the varied doping effects of phosphorus having different (but accessible) valence states.
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Affiliation(s)
- Weisong Li
- School of Chemical Engineering & Technology, State Key Laboratory of Chemical Engineering, Tianjin University Tianjin 300350 China
- Inorganic Chemistry Laboratory, University of Oxford South Parks Road Oxford OX1 3QR UK
| | - Zheng Guo
- School of Chemical Engineering & Technology, State Key Laboratory of Chemical Engineering, Tianjin University Tianjin 300350 China
| | - Litong Jiang
- Inorganic Chemistry Laboratory, University of Oxford South Parks Road Oxford OX1 3QR UK
- Institute of Physics, Chinese Academy of Sciences Beijing 100190 China
| | - Lei Zhong
- School of Chemical Engineering & Technology, State Key Laboratory of Chemical Engineering, Tianjin University Tianjin 300350 China
| | - Guoning Li
- School of Chemical Engineering & Technology, State Key Laboratory of Chemical Engineering, Tianjin University Tianjin 300350 China
| | - Jiajun Zhang
- School of Chemical Engineering & Technology, State Key Laboratory of Chemical Engineering, Tianjin University Tianjin 300350 China
| | - Kai Fan
- School of Chemical Engineering & Technology, State Key Laboratory of Chemical Engineering, Tianjin University Tianjin 300350 China
| | - Sergio Gonzalez-Cortes
- School of Chemical Engineering & Technology, State Key Laboratory of Chemical Engineering, Tianjin University Tianjin 300350 China
| | - Kuijuan Jin
- Institute of Physics, Chinese Academy of Sciences Beijing 100190 China
| | - Chunjian Xu
- School of Chemical Engineering & Technology, State Key Laboratory of Chemical Engineering, Tianjin University Tianjin 300350 China
| | - Tiancun Xiao
- Inorganic Chemistry Laboratory, University of Oxford South Parks Road Oxford OX1 3QR UK
| | - Peter P Edwards
- Inorganic Chemistry Laboratory, University of Oxford South Parks Road Oxford OX1 3QR UK
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14
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Al-Madhagi LH, Callear SK, Schroeder SLM. Hydrophilic and hydrophobic interactions in concentrated aqueous imidazole solutions: a neutron diffraction and total X-ray scattering study. Phys Chem Chem Phys 2020; 22:5105-5113. [DOI: 10.1039/c9cp05993h] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A study of 5 M aqueous imidazole solutions combining neutron and X-ray diffraction with EPSR simulations shows dominance of hydrogen-bonding between imidazole and water and negligible hydrogen-bonding between imidazole molecules.
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Affiliation(s)
- Laila H. Al-Madhagi
- School of Chemical and Process Engineering
- University of Leeds
- Leeds LS2 9JT
- UK
- Diamond Light Source Ltd
| | | | - Sven L. M. Schroeder
- School of Chemical and Process Engineering
- University of Leeds
- Leeds LS2 9JT
- UK
- Diamond Light Source Ltd
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15
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Tritt-Goc J, Lindner Ł, Bielejewski M, Markiewicz E, Pankiewicz R. Proton conductivity and proton dynamics in nanocrystalline cellulose functionalized with imidazole. Carbohydr Polym 2019; 225:115196. [PMID: 31521266 DOI: 10.1016/j.carbpol.2019.115196] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2019] [Revised: 08/09/2019] [Accepted: 08/12/2019] [Indexed: 11/25/2022]
Abstract
In the present study, we report the synthesis, electrical and dynamic properties of a new generation bio-based nanocomposite, that is a proton-exchange membrane based on nanocrystalline cellulose (CNC) and imidazole (Im). CNC serves as supporting material and imidazole acts as a proton donor and proton acceptor at the same time. The nanocomposite (1.3 CNC-Im) was synthesized as a film and shows proton conductivity equal to 4.0 × 10-1 S/m at 160 °C in anhydrous conditions. Analysis of impedance measurements and NMR spectra provided some insight into the macroscopic and microscopic processes involved in proton transport in 1.3 CNC-Im. Local processes such as reorientation of imidazole rings and breaking of hydrogen bonds are identified and their activation energies are calculated. The energies of the macroscopic and microscopic proton transport in CNC-Im film are correlated. The percolation model used confirmed the percolation nature of conductivity in cellulose composites with imidazole.
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Affiliation(s)
- J Tritt-Goc
- Institute of Molecular Physics Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland.
| | - Ł Lindner
- Institute of Molecular Physics Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland.
| | - M Bielejewski
- Institute of Molecular Physics Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland.
| | - E Markiewicz
- Institute of Molecular Physics Polish Academy of Sciences, M. Smoluchowskiego 17, 60-179 Poznań, Poland.
| | - R Pankiewicz
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Uniwersytetu Poznańskiego 8, 61-614 Poznań, Poland.
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16
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Kodchakorn K, Nimmanpipug P, Phongtamrug S, Tashiro K. pH-induced conformational changes in histamine in the solid state. RSC Adv 2019; 9:19375-19389. [PMID: 35519396 PMCID: PMC9065317 DOI: 10.1039/c9ra03418h] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Accepted: 06/03/2019] [Indexed: 11/22/2022] Open
Abstract
Histamine is one of the most basic biogenic amino-compounds, which is composed of imidazole and a flexible ethylamine side chain moiety. Histamine is known to take the form of various types of cations, free base, monocation and dication form, where its conformational change is highly sensitively to the pH conditions. The details of these changes are still controversial due to a lack of detailed information on its crystal structures. Thus, in this study, the molecular packing structures of histidine at various pH were analyzed via X-ray diffraction in combination with vibrational spectroscopy and energy calculations. A variety of molecular conformations including the tautomeric phenomenon was found to be intimately related with intra- and intermolecular hydrogen bonds. The role of the hydrogen bonds was studied also to check the possibility of high proton conductivity of histamine, as predicted by computer simulation. Consequently, the thus-predicted proton conductivity was confirmed for the first time experimentally. During the heating process, the conductivity showed the relatively high maximum value of 10-4 S cm-1 at around 60 °C, which is related to the effective proton transfer between the amino NH group of one histamine unit and the imidazole ring of another.
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Affiliation(s)
- Kanchanok Kodchakorn
- Department of Chemistry, Faculty of Science and Center of Excellence for Innovation in Analytical Science and Technology, Chiang Mai University Chiang Mai 50200 Thailand
- Doctor of Philosophy Program in Chemistry, Faculty of Science, Chiang Mai University Chiang Mai 50200 Thailand
| | - Piyarat Nimmanpipug
- Department of Chemistry, Faculty of Science and Center of Excellence for Innovation in Analytical Science and Technology, Chiang Mai University Chiang Mai 50200 Thailand
| | - Suttinun Phongtamrug
- Department of Industrial Chemistry, Faculty of Applied Science, King Mongkut's University of Technology North Bangkok Bangkok 10800 Thailand
| | - Kohji Tashiro
- Department of Future Industry-Oriented Basic Science and Materials, Graduate School of Engineering, Toyota Technological Institute Tempaku Nagoya 468-8511 Japan
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17
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Kim K, Kashani Rahimi S, Alam TM, Sorte EG, Otaigbe JU. Unexpected effects of inorganic phosphate glass on crystallization and thermo-rheological behavior of polyethylene terephthalate. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.08.066] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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18
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Peedika Paramban R, Afroz Z, Mondal PK, Sahoo J, Chopra D. Structural insights into salts and a salt polymorph of nitrogen containing small organic molecules. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2018.05.067] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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19
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Garaga MN, Dracopoulos V, Werner-Zwanziger U, Zwanziger JW, Maréchal M, Persson M, Nordstierna L, Martinelli A. A long-chain protic ionic liquid inside silica nanopores: enhanced proton mobility due to efficient self-assembly and decoupled proton transport. NANOSCALE 2018; 10:12337-12348. [PMID: 29780989 DOI: 10.1039/c8nr02031k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We report enhanced protonic and ionic dynamics in an imidazole/protic ionic liquid mixture confined within the nanopores of silica particles. The ionic liquid is 1-octylimidazolium bis(trifluoromethanesulfonyl)imide ([HC8Im][TFSI]), while the silica particles are microsized and characterized by internal well connected nanopores. We demonstrate that the addition of imidazole is crucial to promote a proton motion decoupled from molecular diffusion, which occurs due to the establishment of new N-HN hydrogen bonds and fast proton exchange events in the ionic domains, as evidenced by both infrared and 1H NMR spectroscopy. An additional reason for the decoupled motion of protons is the nanosegregated structure adopted by the liquid imidazole/[HC8Im][TFSI] mixture, with segregated polar and non-polar nano-domains, as clearly shown by WAXS data. This arrangement, promoted by the length of the octyl group and thus by significant chain-chain interactions, reduces the mobility of molecules (Dmol) more than that of protons (DH), which is manifested by DH/Dmol ratios greater than three. Once included into the nanopores of hydrophobic silica microparticles, the nanostructure of the liquid mixture is preserved with slightly larger ionic domains, but effects on the non-polar ones are unclear. This results in a further enhancement of proton motion with localised paths of conduction. These findings demonstrate significant progress in the design of proton conducting materials via tailor-made molecular structures as well as by smart exploitation of confinement effects. Compared to other imidazole-based proton conducting materials that are crystalline up to 90 °C or above, the gel materials that we propose are useful for applications at room temperature, and can thus find applications in e.g. intermediate temperature proton exchange fuel cells.
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20
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Spiess HW. 50th Anniversary Perspective: The Importance of NMR Spectroscopy to Macromolecular Science. Macromolecules 2017. [DOI: 10.1021/acs.macromol.6b02736] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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21
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Pöppler AC, Walker D, Brown SP. A combined NMR crystallographic and PXRD investigation of the structure-directing role of water molecules in orotic acid and its lithium and magnesium salts. CrystEngComm 2017. [DOI: 10.1039/c6ce02101h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Cao L, He X, Jiang Z, Li X, Li Y, Ren Y, Yang L, Wu H. Channel-facilitated molecule and ion transport across polymer composite membranes. Chem Soc Rev 2017; 46:6725-6745. [DOI: 10.1039/c5cs00906e] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This tutorial review highlights transport channels within polymer composite membranes and focuses on the regulation of channel microenvironments through bio-inspiration.
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Affiliation(s)
- Li Cao
- Key Laboratory for Green Chemical Technology of Ministry of Education
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Xueyi He
- Key Laboratory for Green Chemical Technology of Ministry of Education
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Zhongyi Jiang
- Key Laboratory for Green Chemical Technology of Ministry of Education
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Xueqin Li
- School of Chemistry and Chemical Engineering/Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan
- Shihezi University
- Shihezi
- China
| | - Yifan Li
- School of Chemical Engineering and Energy
- Zhengzhou University
- Zhengzhou 450001
- P. R. China
| | - Yanxiong Ren
- Key Laboratory for Green Chemical Technology of Ministry of Education
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Leixin Yang
- Key Laboratory for Green Chemical Technology of Ministry of Education
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
| | - Hong Wu
- Key Laboratory for Green Chemical Technology of Ministry of Education
- School of Chemical Engineering and Technology
- Tianjin University
- Tianjin 300072
- China
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23
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Thanganathan U. Synthesis and characterization of hybrid composite membranes and their properties: Single cell performances based on carbon black catalyst/proton-conducting hybrid composite membrane for H2/O2 fuel cells. J Memb Sci 2016. [DOI: 10.1016/j.memsci.2016.05.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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24
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Sun Q, Harvey JA, Greco KV, Auerbach SM. Molecular Simulations of Hydrogen Bond Cluster Size and Reorientation Dynamics in Liquid and Glassy Azole Systems. J Phys Chem B 2016; 120:10411-10419. [DOI: 10.1021/acs.jpcb.6b07148] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Qinfang Sun
- Department
of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Jacob A. Harvey
- Department
of Chemistry, University of Kansas, Lawrence, Kansas 66045, United States
| | - Katharine V. Greco
- Department
of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, United States
| | - Scott M. Auerbach
- Department
of Chemistry, University of Massachusetts, Amherst, Massachusetts 01003, United States
- Department
of Chemical Engineering, University of Massachusetts, Amherst, Massachusetts 01003, United States
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25
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Arhangelskis M, Eddleston MD, Reid DG, Day GM, Bučar DK, Morris AJ, Jones W. Rationalization of the Color Properties of Fluorescein in the Solid State: A Combined Computational and Experimental Study. Chemistry 2016; 22:10065-73. [PMID: 27303817 PMCID: PMC4982065 DOI: 10.1002/chem.201601340] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Indexed: 11/10/2022]
Abstract
Fluorescein is known to exist in three tautomeric forms defined as quinoid, zwitterionic, and lactoid. In the solid state, the quinoid and zwitterionic forms give rise to red and yellow materials, respectively. The lactoid form has not been crystallized pure, although its cocrystal and solvate forms exhibit colors ranging from yellow to green. An explanation for the observed colors of the crystals is found using a combination of UV/Vis spectroscopy and plane-wave DFT calculations. The role of cocrystal coformers in modifying crystal color is also established. Several new crystal structures are determined using a combination of X-ray and electron diffraction, solid-state NMR spectroscopy, and crystal structure prediction (CSP). The protocol presented herein may be used to predict color properties of materials prior to their synthesis.
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Affiliation(s)
- Mihails Arhangelskis
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Mark D Eddleston
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - David G Reid
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Graeme M Day
- School of Chemistry, University of Southampton, Highfield, Southampton, SO17 1BJ, UK
| | - Dejan-Krešimir Bučar
- Department of Chemistry, University College London, 20 Gordon Street, London, WC1H 0AJ, UK
| | - Andrew J Morris
- Theory of Condensed Matter Group, Cavendish Laboratory, University of Cambridge, J J Thomson Avenue, Cambridge, CB3 0HE, UK
| | - William Jones
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.
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26
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Inukai M, Horike S, Itakura T, Shinozaki R, Ogiwara N, Umeyama D, Nagarkar S, Nishiyama Y, Malon M, Hayashi A, Ohhara T, Kiyanagi R, Kitagawa S. Encapsulating Mobile Proton Carriers into Structural Defects in Coordination Polymer Crystals: High Anhydrous Proton Conduction and Fuel Cell Application. J Am Chem Soc 2016; 138:8505-11. [DOI: 10.1021/jacs.6b03625] [Citation(s) in RCA: 126] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Munehiro Inukai
- Institute
for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida, Sakyo-ku,
Kyoto 606-8501, Japan
- Graduate
School of Science and Technology, Tokushima University, 2-1 minami-Josanjima-Cho, Tokushima 770-8506, Japan
| | - Satoshi Horike
- Department
of Synthetic Chemistry and Biological Chemistry, Graduate School of
Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Tomoya Itakura
- DENSO Corporation, 1-1, Showa-cho, Kariya, Aichi 448-8661, Japan
| | - Ryota Shinozaki
- DENSO Corporation, 1-1, Showa-cho, Kariya, Aichi 448-8661, Japan
| | - Naoki Ogiwara
- Department
of Synthetic Chemistry and Biological Chemistry, Graduate School of
Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Daiki Umeyama
- Department
of Synthetic Chemistry and Biological Chemistry, Graduate School of
Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Sanjog Nagarkar
- Institute
for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida, Sakyo-ku,
Kyoto 606-8501, Japan
| | - Yusuke Nishiyama
- JEOL Resonance
Inc., 3-1-2 Musashino, Akishima, Tokyo 196-8558, Japan
- RIKEN CLST-JEOL Collaboration
Center, Yokohama, Kanagawa 230-0045, Japan
| | - Michal Malon
- JEOL Resonance
Inc., 3-1-2 Musashino, Akishima, Tokyo 196-8558, Japan
- RIKEN CLST-JEOL Collaboration
Center, Yokohama, Kanagawa 230-0045, Japan
| | - Akari Hayashi
- International
Research Center for Hydrogen Energy, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Takashi Ohhara
- J-PARC Center,
Japan Atomic Energy Agency, Tokai, Naka-gun 319-1195, Japan
- Research Center
for Neutron Science and Technology, Comprehensive Research Organization
for Science and Society, Tokai, Ibaraki 319-1106, Japan
| | - Ryoji Kiyanagi
- J-PARC Center,
Japan Atomic Energy Agency, Tokai, Naka-gun 319-1195, Japan
| | - Susumu Kitagawa
- Institute
for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Yoshida, Sakyo-ku,
Kyoto 606-8501, Japan
- Department
of Synthetic Chemistry and Biological Chemistry, Graduate School of
Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
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27
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Ivanir-Dabora H, Nimerovsky E, Madhu PK, Goldbourt A. Site-Resolved Backbone and Side-Chain Intermediate Dynamics in a Carbohydrate-Binding Module Protein Studied by Magic-Angle Spinning NMR Spectroscopy. Chemistry 2015; 21:10778-85. [DOI: 10.1002/chem.201500856] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Indexed: 12/12/2022]
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28
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Li S, Trébosc J, Lafon O, Zhou L, Shen M, Pourpoint F, Amoureux JP, Deng F. Observation of 1H-13C and 1H-1H proximities in a paramagnetic solid by NMR at high magnetic field under ultra-fast MAS. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2015; 251:36-42. [PMID: 25557861 DOI: 10.1016/j.jmr.2014.11.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2014] [Revised: 11/28/2014] [Accepted: 11/30/2014] [Indexed: 06/04/2023]
Abstract
The assignment of NMR signals in paramagnetic solids is often challenging since: (i) the large paramagnetic shifts often mask the diamagnetic shifts specific to the local chemical environment, and (ii) the hyperfine interactions with unpaired electrons broaden the NMR spectra and decrease the coherence lifetime, thus reducing the efficiency of usual homo- and hetero-nuclear NMR correlation experiments. Here we show that the assignment of (1)H and (13)C signals in isotopically unmodified paramagnetic compounds with moderate hyperfine interactions can be facilitated by the use of two two-dimensional (2D) experiments: (i) (1)H-(13)C correlations with (1)H detection and (ii) (1)H-(1)H double-quantum↔single-quantum correlations. These methods are experimentally demonstrated on isotopically unmodified copper (II) complex of l-alanine at high magnetic field (18.8 T) and ultra-fast Magic Angle Spinning (MAS) frequency of 62.5 kHz. Compared to (13)C detection, we show that (1)H detection leads to a 3-fold enhancement in sensitivity for (1)H-(13)C 2D correlation experiments. By combining (1)H-(13)C and (1)H-(1)H 2D correlation experiments with the analysis of (13)C longitudinal relaxation times, we have been able to assign the (1)H and (13)C signals of each l-alanine ligand.
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Affiliation(s)
- Shenhui Li
- National Center for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Julien Trébosc
- Univ. Lille North of France, Unit of Catalysis and Chemistry of Solids (UCCS), CNRS UMR 8181, ENSCL, Univ. Lille 1, Villeneuve d'Ascq 59652, France
| | - Olivier Lafon
- Univ. Lille North of France, Unit of Catalysis and Chemistry of Solids (UCCS), CNRS UMR 8181, ENSCL, Univ. Lille 1, Villeneuve d'Ascq 59652, France.
| | - Lei Zhou
- National Center for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Ming Shen
- Univ. Lille North of France, Unit of Catalysis and Chemistry of Solids (UCCS), CNRS UMR 8181, ENSCL, Univ. Lille 1, Villeneuve d'Ascq 59652, France; Physics Department & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200062, China
| | - Frédérique Pourpoint
- Univ. Lille North of France, Unit of Catalysis and Chemistry of Solids (UCCS), CNRS UMR 8181, ENSCL, Univ. Lille 1, Villeneuve d'Ascq 59652, France
| | - Jean-Paul Amoureux
- Univ. Lille North of France, Unit of Catalysis and Chemistry of Solids (UCCS), CNRS UMR 8181, ENSCL, Univ. Lille 1, Villeneuve d'Ascq 59652, France; Physics Department & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200062, China.
| | - Feng Deng
- National Center for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China.
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29
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Zhang H, Wu W, Wang J, Zhang T, Shi B, Liu J, Cao S. Enhanced anhydrous proton conductivity of polymer electrolyte membrane enabled by facile ionic liquid-based hoping pathways. J Memb Sci 2015. [DOI: 10.1016/j.memsci.2014.11.033] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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30
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Sardo M, Santos SM, Babaryk AA, López C, Alkorta I, Elguero J, Claramunt RM, Mafra L. Diazole-based powdered cocrystal featuring a helical hydrogen-bonded network: structure determination from PXRD, solid-state NMR and computer modeling. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2015; 65:49-63. [PMID: 25604487 DOI: 10.1016/j.ssnmr.2014.12.005] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2014] [Accepted: 12/07/2014] [Indexed: 06/04/2023]
Abstract
We present the structure of a new equimolar 1:1 cocrystal formed by 3,5-dimethyl-1H-pyrazole (dmpz) and 4,5-dimethyl-1H-imidazole (dmim), determined by means of powder X-ray diffraction data combined with solid-state NMR that provided insight into topological details of hydrogen bonding connectivities and weak interactions such as CH···π contacts. The use of various 1D/2D (13)C, (15)N and (1)H high-resolution solid-state NMR techniques provided structural insight on local length scales revealing internuclear proximities and relative orientations between the dmim and dmpz molecular building blocks of the studied cocrystal. Molecular modeling and DFT calculations were also employed to generate meaningful structures. DFT refinement was able to decrease the figure of merit R(F(2)) from ~11% (PXRD only) to 5.4%. An attempt was made to rationalize the role of NH···N and CH···π contacts in stabilizing the reported cocrystal. For this purpose four imidazole derivatives with distinct placement of methyl substituents were reacted with dmpz to understand the effect of methylation in blocking or enabling certain intermolecular contacts. Only one imidazole derivative (dmim) was able to incorporate into the dmpz trimeric motif thus resulting in a cocrystal, which contains both hydrophobic (methyl groups) and hydrophilic components that self-assemble to form an atypical 1D network of helicoidal hydrogen bonded pattern, featuring structural similarities with alpha-helix arrangements in proteins. The 1:1 dmpz···dmim compound I is the first example of a cocrystal formed by two different azoles.
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Affiliation(s)
- Mariana Sardo
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Sérgio M Santos
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
| | - Artem A Babaryk
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal; Faculty of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska s. 64/13, 01601 Kyiv, Ukraine
| | - Concepción López
- Departamento de Química Orgánica y Bio-Orgánica, Facultad de Ciencias, UNED, Senda del Rey 9, E-28040 Madrid, Spain
| | - Ibon Alkorta
- Instituto de Química Médica (CSIC), Juan de la Cierva 3, E-28006 Madrid, Spain
| | - José Elguero
- Instituto de Química Médica (CSIC), Juan de la Cierva 3, E-28006 Madrid, Spain
| | - Rosa M Claramunt
- Departamento de Química Orgánica y Bio-Orgánica, Facultad de Ciencias, UNED, Senda del Rey 9, E-28040 Madrid, Spain.
| | - Luís Mafra
- Department of Chemistry, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal.
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31
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Mondal A, Balasubramanian S. Vibrational Signatures of Cation–Anion Hydrogen Bonding in Ionic Liquids: A Periodic Density Functional Theory and Molecular Dynamics Study. J Phys Chem B 2015; 119:1994-2002. [DOI: 10.1021/jp5113679] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Anirban Mondal
- Chemistry and Physics of
Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560 064, India
| | - Sundaram Balasubramanian
- Chemistry and Physics of
Materials Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore 560 064, India
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32
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Kins CF, Sengupta E, Kaltbeitzel A, Wagner M, Lieberwirth I, Spiess HW, Hansen MR. Morphological Anisotropy and Proton Conduction in Multiblock Copolyimide Electrolyte Membranes. Macromolecules 2014. [DOI: 10.1021/ma500253s] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Christoph F. Kins
- Max Planck Institute
for Polymer Research, Ackermannweg
10, D-55128 Mainz, Germany
| | - Esha Sengupta
- Max Planck Institute
for Polymer Research, Ackermannweg
10, D-55128 Mainz, Germany
| | - Anke Kaltbeitzel
- Max Planck Institute
for Polymer Research, Ackermannweg
10, D-55128 Mainz, Germany
| | - Manfred Wagner
- Max Planck Institute
for Polymer Research, Ackermannweg
10, D-55128 Mainz, Germany
| | - Ingo Lieberwirth
- Max Planck Institute
for Polymer Research, Ackermannweg
10, D-55128 Mainz, Germany
| | - Hans Wolfgang Spiess
- Max Planck Institute
for Polymer Research, Ackermannweg
10, D-55128 Mainz, Germany
| | - Michael Ryan Hansen
- Max Planck Institute
for Polymer Research, Ackermannweg
10, D-55128 Mainz, Germany
- Interdisciplinary
Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark
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33
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Yang LY, Wei DX, Xu M, Yao YF, Chen Q. Transferring Lithium Ions in Nanochannels: A PEO/Li+Solid Polymer Electrolyte Design. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201307423] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Transferring Lithium Ions in Nanochannels: A PEO/Li+Solid Polymer Electrolyte Design. Angew Chem Int Ed Engl 2014; 53:3631-5. [DOI: 10.1002/anie.201307423] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Revised: 11/25/2013] [Indexed: 11/07/2022]
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Campagne B, Silly G, David G, Améduri B, Jones DJ, Rozière J, Roche I. Anhydrous proton motion study by solid state NMR spectroscopy in novel PEMFC blend membranes composed of fluorinated copolymer bearing 1,2,4-triazole functional groups and sPEEK. RSC Adv 2014. [DOI: 10.1039/c4ra02338b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
The proton mobility in a new family of PEMFC blend membranes containing 1,2,4-triazole groups is studied by infrared and solid state NMR spectroscopies.
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Affiliation(s)
- Benjamin Campagne
- Ingénierie et Architectures Macromoléculaires
- Institut Charles Gerhardt UMR CNRS 5253
- Ecole Nationale Supérieure de Chimie de Montpellier
- 34296 Montpellier Cedex 5, France
- Agrégats
| | - Gilles Silly
- Chalcogénures et Verres
- Institut Charles Gerhardt UMR CNRS 5253
- Université Montpellier 2
- 34095 Montpellier Cedex 5, France
| | - Ghislain David
- Ingénierie et Architectures Macromoléculaires
- Institut Charles Gerhardt UMR CNRS 5253
- Ecole Nationale Supérieure de Chimie de Montpellier
- 34296 Montpellier Cedex 5, France
| | - Bruno Améduri
- Ingénierie et Architectures Macromoléculaires
- Institut Charles Gerhardt UMR CNRS 5253
- Ecole Nationale Supérieure de Chimie de Montpellier
- 34296 Montpellier Cedex 5, France
| | - Deborah J. Jones
- Agrégats
- Interfaces et Matériaux pour l'Energie
- Institut Charles Gerhardt UMR CNRS 5253
- Université Montpellier 2
- 34095 Montpellier Cedex 5, France
| | - Jacques Rozière
- Agrégats
- Interfaces et Matériaux pour l'Energie
- Institut Charles Gerhardt UMR CNRS 5253
- Université Montpellier 2
- 34095 Montpellier Cedex 5, France
| | - Ivan Roche
- PSA Peugeot-Citroën
- Centre Technique de Vélizy A
- , France
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Soberats B, Yoshio M, Ichikawa T, Taguchi S, Ohno H, Kato T. 3D Anhydrous proton-transporting nanochannels formed by self-assembly of liquid crystals composed of a sulfobetaine and a sulfonic acid. J Am Chem Soc 2013; 135:15286-9. [PMID: 24079720 DOI: 10.1021/ja407883b] [Citation(s) in RCA: 116] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Herein we describe anhydrous proton transportation through 3D interconnected pathways formed by self-assembled molecular complexes. A thermotropic bicontinuous cubic (Cub(bi)) phase has been successfully obtained by mixing a wedge-shaped sulfobetaine with benzenesulfonic acid in different ratios. These ionic complexes exhibit the Cub(bi) phase in a wide range of temperatures, while the single zwitterionic compound shows only a columnar hexagonal phase, and benzenesulfonic acid is nonmesomorphic. Anhydrous proton conduction on the order of 10(-4) S cm(-1) has been achieved for the mixture in the Cub(bi) phase over 100 °C, which can be useful for the development of new electrolytes for the next generation of fuel cells.
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Affiliation(s)
- Bartolome Soberats
- Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo , Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Yang T, Huang N, Meng L. Chitosan modified by nitrogen-containing heterocycle and its excellent performance for anhydrous proton conduction. RSC Adv 2013. [DOI: 10.1039/c3ra23139a] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Çelik SÜ, Bozkurt A, Hosseini SS. Alternatives toward proton conductive anhydrous membranes for fuel cells: Heterocyclic protogenic solvents comprising polymer electrolytes. Prog Polym Sci 2012. [DOI: 10.1016/j.progpolymsci.2011.11.006] [Citation(s) in RCA: 111] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Harvey JA, Basak D, Venkataraman D, Auerbach SM. Simulating hydrogen-bond clustering and phase behaviour of imidazole oligomers. Mol Phys 2012. [DOI: 10.1080/00268976.2012.680515] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Boroglu MS, Celik SU, Bozkurt A, Boz I. Fabrication and characterization of anhydrous polymer electrolyte membranes based on sulfonated poly(vinyl alcohol) and benzimidazole. POLYMER SCIENCE SERIES A 2012. [DOI: 10.1134/s0965545x12030066] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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41
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Brown SP. Applications of high-resolution 1H solid-state NMR. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2012; 41:1-27. [PMID: 22177472 DOI: 10.1016/j.ssnmr.2011.11.006] [Citation(s) in RCA: 184] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2011] [Revised: 11/15/2011] [Accepted: 11/16/2011] [Indexed: 05/25/2023]
Abstract
This article reviews the large increase in applications of high-resolution (1)H magic-angle spinning (MAS) solid-state NMR, in particular two-dimensional heteronuclear and homonuclear (double-quantum and spin-diffusion NOESY-like exchange) experiments, in the last five years. These applications benefit from faster MAS frequencies (up to 80 kHz), higher magnetic fields (up to 1 GHz) and pulse sequence developments (e.g., homonuclear decoupling sequences applicable under moderate and fast MAS). (1)H solid-state NMR techniques are shown to provide unique structural insight for a diverse range of systems including pharmaceuticals, self-assembled supramolecular structures and silica-based inorganic-organic materials, such as microporous and mesoporous materials and heterogeneous organometallic catalysts, for which single-crystal diffraction structures cannot be obtained. The power of NMR crystallography approaches that combine experiment with first-principles calculations of NMR parameters (notably using the GIPAW approach) are demonstrated, e.g., to yield quantitative insight into hydrogen-bonding and aromatic CH-π interactions, as well as to generate trial three-dimensional packing arrangements. It is shown how temperature-dependent changes in the (1)H chemical shift, linewidth and DQ-filtered signal intensity can be analysed to determine the thermodynamics and kinetics of molecular level processes, such as the making and breaking of hydrogen bonds, with particular application to proton-conducting materials. Other applications to polymers and biopolymers, inorganic compounds and bioinorganic systems, paramagnetic compounds and proteins are presented. The potential of new technological advances such as DNP methods and new microcoil designs is described.
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Affiliation(s)
- Steven P Brown
- Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom.
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42
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Kucuk AC, Matsui J, Miyashita T. Proton-conducting electrolyte film of double-decker-shaped polyhedral silsesquioxane containing covalently bonded phosphonic acid groups. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm15779a] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Thanganathan U. Effects of imidazole on the thermal and conductivity properties of hybrid membrane based on poly(vinyl alcohol)/SiO2. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm30975k] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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44
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Webber AL, Masiero S, Pieraccini S, Burley JC, Tatton AS, Iuga D, Pham TN, Spada GP, Brown SP. Identifying guanosine self assembly at natural isotopic abundance by high-resolution 1H and 13C solid-state NMR spectroscopy. J Am Chem Soc 2011; 133:19777-95. [PMID: 22034827 DOI: 10.1021/ja206516u] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
By means of the (1)H chemical shifts and the proton-proton proximities as identified in (1)H double-quantum (DQ) combined rotation and multiple-pulse spectroscopy (CRAMPS) solid-state NMR correlation spectra, ribbon-like and quartet-like self-assembly can be identified for guanosine derivatives without isotopic labeling for which it was not possible to obtain single crystals suitable for diffraction. Specifically, characteristic spectral fingerprints are observed for dG(C10)(2) and dG(C3)(2) derivatives, for which quartet-like and ribbon-like self-assembly has been unambiguously identified by (15)N refocused INADEQUATE spectra in a previous study of (15)N-labeled derivatives (Pham, T. N.; et al. J. Am. Chem. Soc.2005, 127, 16018). The NH (1)H chemical shift is observed to be higher (13-15 ppm) for ribbon-like self-assembly as compared to 10-11 ppm for a quartet-like arrangement, corresponding to a change from NH···N to NH···O intermolecular hydrogen bonding. The order of the two NH(2)(1)H chemical shifts is also inverted, with the NH(2) proton closest in space to the NH proton having a higher or lower (1)H chemical shift than that of the other NH(2) proton for ribbon-like as opposed to quartet-like self-assembly. For the dG(C3)(2) derivative for which a single-crystal diffraction structure is available, the distinct resonances and DQ peaks are assigned by means of gauge-including projector-augmented wave (GIPAW) chemical shift calculations. In addition, (14)N-(1)H correlation spectra obtained at 850 MHz under fast (60 kHz) magic-angle spinning (MAS) confirm the assignment of the NH and NH(2) chemical shifts for the dG(C3)(2) derivative and allow longer range through-space N···H proximities to be identified, notably to the N7 nitrogens on the opposite hydrogen-bonding face.
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Affiliation(s)
- Amy L Webber
- Department of Physics, University of Warwick, Coventry CV4 7AL, United Kingdom
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Harms C, Wilhelm M, Grathwohl G. Influence of PDMS chain length on proton conductivity in polysiloxane based membranes for HT-PEMFC application. J Memb Sci 2011. [DOI: 10.1016/j.memsci.2011.08.049] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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46
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Graf R. New proton conducting materials for technical applications: what can we learn from solid state NMR studies? SOLID STATE NUCLEAR MAGNETIC RESONANCE 2011; 40:127-133. [PMID: 21996452 DOI: 10.1016/j.ssnmr.2011.09.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2011] [Revised: 09/22/2011] [Accepted: 09/23/2011] [Indexed: 05/31/2023]
Abstract
Many novel proton conducting materials are based on complex hydrogen bonding networks of amphoteric hydrogen bonded moieties. Solid state NMR provides unique methods to study the properties of such network and specific proton conduction mechanisms in detail. In particular 1H solid state NMR techniques under fast magic angle spinning are powerful tools in this area. Site specific studies of the dynamic behavior via variable temperature 1H MAS measurements provide insight in the thermodynamics of the hydrogen bonding as well as activation energies for the proton transfer between the amphoteric sites. On macroscopic length scales, pulsed field gradient NMR experiments are able to determine the proton mobility and the contribution of different conduction mechanisms. In this article, aspects of recent solid state NMR studies in the field are reviewed and typical experimental methods as well as their possible outcome are discussed.
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Affiliation(s)
- Robert Graf
- Department of Polymer Spectroscopy, Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
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47
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Kobayashi T, Mao K, Wang SG, Lin VSY, Pruski M. Molecular ordering of mixed surfactants in mesoporous silicas: a solid-state NMR study. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2011; 39:65-71. [PMID: 21392947 DOI: 10.1016/j.ssnmr.2011.02.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2010] [Revised: 01/03/2011] [Accepted: 02/05/2011] [Indexed: 05/30/2023]
Abstract
The use of mixed surfactants in the synthesis of mesoporous silica nanoparticles (MSNs) is of importance in the context of adjusting pore structures, sizes and morphologies. In the present study, the arrangement of molecules in micelles produced from a mixture of two surfactants, cetyltrimethylammonium bromide (CTAB) and cetylpyridinium bromide (CPB) was detailed by solid-state NMR spectroscopy. Proximities of methyl protons in the trimethylammonium headgroup of CTAB and protons in the pyridinium headgroup of CPB were observed under fast magic angle spinning (MAS) by (1)H-(1)H double quantum (DQ) MAS NMR and NOESY. This result suggested that CTAB and CPB co-exist in the pores without forming significant monocomponent domain structures. (1)H-(29)Si heteronuclear correlation (HETCOR) NMR showed that protons in the headgroups of CTAB are in closer proximity to the silica surface than those in the CPB headgroups. The structural information obtained in this investigation leads to better understanding of the mechanisms of self-assembly and their role in determining the structure and morphology of mesoporous materials.
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Zhengbang W, Tang H, Mu P. Self-assembly of durable Nafion/TiO2 nanowire electrolyte membranes for elevated-temperature PEM fuel cells. J Memb Sci 2011. [DOI: 10.1016/j.memsci.2010.11.070] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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49
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O’Dell LA, Schurko RW, Harris KJ, Autschbach J, Ratcliffe CI. Interaction Tensors and Local Dynamics in Common Structural Motifs of Nitrogen: A Solid-State 14N NMR and DFT Study. J Am Chem Soc 2010; 133:527-46. [DOI: 10.1021/ja108181y] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Luke A. O’Dell
- Steacie Institute for Molecular Sciences, National Research Council, 100 Sussex Drive, Ottawa, K1A 0R6 Ontario, Canada, Department of Chemistry, University of Windsor, 401 Sunset Avenue, Windsor, N9B 3P4 Ontario, Canada, and Department of Chemistry, 312 Natural Sciences Complex, State University of New York at Buffalo, Buffalo, New York 14260-3000, United States
| | - Robert W. Schurko
- Steacie Institute for Molecular Sciences, National Research Council, 100 Sussex Drive, Ottawa, K1A 0R6 Ontario, Canada, Department of Chemistry, University of Windsor, 401 Sunset Avenue, Windsor, N9B 3P4 Ontario, Canada, and Department of Chemistry, 312 Natural Sciences Complex, State University of New York at Buffalo, Buffalo, New York 14260-3000, United States
| | - Kristopher J. Harris
- Steacie Institute for Molecular Sciences, National Research Council, 100 Sussex Drive, Ottawa, K1A 0R6 Ontario, Canada, Department of Chemistry, University of Windsor, 401 Sunset Avenue, Windsor, N9B 3P4 Ontario, Canada, and Department of Chemistry, 312 Natural Sciences Complex, State University of New York at Buffalo, Buffalo, New York 14260-3000, United States
| | - Jochen Autschbach
- Steacie Institute for Molecular Sciences, National Research Council, 100 Sussex Drive, Ottawa, K1A 0R6 Ontario, Canada, Department of Chemistry, University of Windsor, 401 Sunset Avenue, Windsor, N9B 3P4 Ontario, Canada, and Department of Chemistry, 312 Natural Sciences Complex, State University of New York at Buffalo, Buffalo, New York 14260-3000, United States
| | - Christopher I. Ratcliffe
- Steacie Institute for Molecular Sciences, National Research Council, 100 Sussex Drive, Ottawa, K1A 0R6 Ontario, Canada, Department of Chemistry, University of Windsor, 401 Sunset Avenue, Windsor, N9B 3P4 Ontario, Canada, and Department of Chemistry, 312 Natural Sciences Complex, State University of New York at Buffalo, Buffalo, New York 14260-3000, United States
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50
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Li J, Yang X, Tang H, Pan M. Durable and high performance Nafion membrane prepared through high-temperature annealing methodology. J Memb Sci 2010. [DOI: 10.1016/j.memsci.2010.06.016] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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