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Sato C, Dekura S, Sato H, Sambe K, Takeda T, Kurihara T, Mizuno M, Taniguchi T, Wu J, Nakamura T, Akutagawa T. Proton Conduction in Chiral Molecular Assemblies of Azolium-Camphorsulfonate Salts. J Am Chem Soc 2024; 146:22699-22710. [PMID: 39083719 DOI: 10.1021/jacs.4c07429] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/02/2024]
Abstract
Chiral molecular assemblies have attracted considerable attention because of their interesting physical properties, such as spin-selective electron transport. Cation-anion salts of three azolium cations, imidazolium (HIm+), triazolium (HTrz+), and thiazolium (HThz+), in combination with a chiral camphorsulfonate (1S-CS-) and their racemic compounds (rac-CS-) were prepared and compared in terms of phase transitions, crystal structures, dynamics of constituent molecules, dielectric responses, and proton conductivities. The cation-anion crystals containing HIm+ showed no significant difference in proton conductivity between the homochiral and racemic crystals, whereas the HTrz+-containing crystals showed higher proton conductivity and lower activation energy in the homochiral form than in the racemic form. A two-dimensional hydrogen-bonding network consisting of HTrz+ and -SO3- groups and similar in-plane rotational motion was observed in both crystals; however, the HTrz+ cation in the homochiral crystal exhibited the rotational motion modulated with translational motion, whereas the HTrz+ cation in the racemic crystal exhibited almost steady in-plane rotational motion. The different motional degrees of freedom were confirmed by crystal structure analyses and temperature- and frequency-dependent dielectric constants. In contrast, steady in-plane rotational motion with the thermally activated fluctuating motion of CS- was observed both in homochiral and racemic crystals containing HIm+, which averaged the motional space of protons resulting in similar dielectric responses and proton conductivities. The control of motional degrees of freedom in homochiral crystals affects the proton conductivity and is useful for the design of molecular proton conductors.
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Affiliation(s)
- Chisato Sato
- Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan
| | - Shun Dekura
- Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
| | - Hiroyasu Sato
- Rigaku Corporation, Akishima, Tokyo, 196-8666, Japan
| | - Kohei Sambe
- Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan
| | - Takashi Takeda
- Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
| | - Takuya Kurihara
- Department of Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-Machi, Kanazawa, Ishikawa, 920-1192, Japan
| | - Motohiro Mizuno
- Department of Chemistry, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma-Machi, Kanazawa, Ishikawa, 920-1192, Japan
- Nanomaterials Research Institute, Kanazawa University, Kakuma-Machi, Kanazawa, Ishikawa, 920-1192, Japan
- Institute for Frontier Science Initiative, Kanazawa University, Kakuma-Machi, Kanazawa, Ishikawa, 920-1192, Japan
| | - Takuya Taniguchi
- Center for Data Science, Waseda University, 1-6-1 Nishiwaseda, Shinjuku-ku, Tokyo, 169-8050, Japan
| | - Jiabing Wu
- Graduate School of Environmental Science, Hokkaido University, N10W5, Kita-ku, Sapporo, 060-0810, Japan
- Research Institute for Electronic Science, Hokkaido University, N20W10, Kita-ku, Sapporo 001-0020, Japan
| | - Takayoshi Nakamura
- Graduate School of Environmental Science, Hokkaido University, N10W5, Kita-ku, Sapporo, 060-0810, Japan
- Research Institute for Electronic Science, Hokkaido University, N20W10, Kita-ku, Sapporo 001-0020, Japan
| | - Tomoyuki Akutagawa
- Graduate School of Engineering, Tohoku University, Sendai, 980-8579, Japan
- Institute of Multidisciplinary Research for Advanced Materials (IMRAM), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
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Pal SC, Mukherjee D, Oruganti Y, Lee BG, Lim DW, Pramanik B, Manna AK, Das MC. Room-Temperature Superprotonic Conductivity beyond 10 -1 S cm -1 in a Co(II) Coordination Polymer. J Am Chem Soc 2024; 146:14546-14557. [PMID: 38748181 DOI: 10.1021/jacs.4c01113] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/30/2024]
Abstract
An efficient design of crystalline solid-state proton conductors (SSPCs) is crucial for the progress of clean energy applications. Developing such materials to make them work at room temperature with a conductivity of ≥10-1 S cm-1 is of significant interest in terms of technical and commercial aspects. Utilizing the recently highlighted "coordinated-water-driven proton conduction" approach, herein, we have rationally synthesized two highly stable and scalable 1D Co(II) coordination polymers (CPs) as SSPCs, PCM-2 {[Co(bpy)(H2O)2(NO3)2]·H2O}n and PCM-3 {[Co2(bpy)2(SO4)2(H2O)6].4H2O}n, with distinct alignments in coordinated water and coordinated oxo-anions (nitrate and sulfate, respectively). The acidity of the metal-bound water molecules in PCM-2 is further enhanced through cooperative long-range continuous H bonds with coordinated Brønsted basic nitrates (proton acceptors), leading to ultrahigh superprotonic conductivities even at 25 °C (1.03 × 10-1 S cm-1 under 95% RH), and reached a maximum of 2.99 × 10-1 S cm-1 at 85 °C (95% RH). The conductivity at 25 °C is even higher than that of commercial Nafion 117 (6.74 × 10-2 S cm-1 at 100% RH). The absence of such an H-bonding interaction in PCM-3 (closed loops) resulted in a lesser conductivity of 5.87 × 10-5 S cm-1 (95% RH, 85 °C). PCM-2 represents the first example of SSPC exhibiting conductivity in the order 10-1 S cm-1 at ambient temperature (25 °C) with excellent recyclability.
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Affiliation(s)
- Shyam Chand Pal
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, West Bengal, India
| | - Debolina Mukherjee
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, West Bengal, India
| | - Yasaswini Oruganti
- Department of Chemistry and Medical Chemistry, Yonsei University, Wonju, Gangwondo 26493, Republic of Korea
| | - Byoung Gwan Lee
- Department of Chemistry and Medical Chemistry, Yonsei University, Wonju, Gangwondo 26493, Republic of Korea
| | - Dae-Woon Lim
- Department of Chemistry and Medical Chemistry, Yonsei University, Wonju, Gangwondo 26493, Republic of Korea
| | - Bikram Pramanik
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, West Bengal, India
| | - Arun K Manna
- Department of Chemistry and Center for Atomic, Molecular and Optical Sciences & Technologies, Indian Institute of Technology Tirupati, Tirupati, Andhra Pradesh 517619, India
| | - Madhab C Das
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, West Bengal, India
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Firth AJ, Nakasu PYS, Hallett JP, Matthews RP. Exploiting Cation Structure and Water Content in Modulating the Acidity of Ammonium Hydrogen Sulfate Protic Ionic Liquids. J Phys Chem Lett 2024; 15:2311-2318. [PMID: 38386631 PMCID: PMC10926163 DOI: 10.1021/acs.jpclett.3c03583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2023] [Revised: 02/07/2024] [Accepted: 02/19/2024] [Indexed: 02/24/2024]
Abstract
In this paper, we investigated the effect of cation structure and water content on proton dissociation in alkylammonium [HSO4]- protic ionic liquids (ILs) doped with 20 wt % water and correlated this with experimental Hammett acidities. For pure systems, increased cation substitution resulted in a reduction in the number of direct anion-anion neighbors leading to larger numbers of small aggregates, which is further enhanced with addition of water. We also observed spontaneous proton dissociation from [HSO4]- to water only for primary amine-based protic ILs, preceded by the formation of an anion trimer motif. Investigation using DFT calculations revealed spontaneous proton dissociation from [HSO4]- to water can occur for each of the protic ILs investigated; however, this is dependent on the size of the anion aggregates. These findings are important in the fields of catalysis and lignocellulosic biomass, where solvent acidity is a crucial parameter in biomass fractionation and lignin chemistry.
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Affiliation(s)
- Anton
E. J. Firth
- Department
of Chemical Engineering, Imperial College
London, London SW7 2AZ, U.K.
| | - Pedro Y. S. Nakasu
- Department
of Chemical Engineering, Imperial College
London, London SW7 2AZ, U.K.
| | - Jason P. Hallett
- Department
of Chemical Engineering, Imperial College
London, London SW7 2AZ, U.K.
| | - Richard P. Matthews
- Department
of Chemical Engineering, Imperial College
London, London SW7 2AZ, U.K.
- Department
of Bioscience, School of Health, Sports and Bioscience, University of East London, Stratford, London E15 4LZ, U.K.
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Tu TA, Huy Phuc NH. Anhydrous proton-conducting imidazole triflate-SiO 2 composite. Heliyon 2022; 8:e12527. [PMID: 36593837 PMCID: PMC9803831 DOI: 10.1016/j.heliyon.2022.e12527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2022] [Revised: 11/24/2022] [Accepted: 12/14/2022] [Indexed: 12/24/2022] Open
Abstract
ImidazoleTriflate (ITF)-SiO2 composites xITF-(100-x)SiO2 were prepared by planetary ball-milling method. The structure of the composites was studied by TG-DTA, XRD and FT-IR methods. The ionic conductivity was assessed by alternative current (AC) electrochemical impedance measurement. From XRD results, the crystal size of imidazole triflate became smaller as its loading in xITF-(100-x)SiO2 decreased. With x = 40 weight percent, the calculated crystal size was about 7.3 nm. FT-IR spectra showed the existence of CF3SO3 -···H+ ion aggregates and imidazole-proton bonds. The electrical conductivity of sample x = 50 was about 6.3 × 10-3 Scm-1 at 130 °C under anhydrous condition and about 30 times higher than that of sample x = 100.
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Affiliation(s)
- Tran Anh Tu
- Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Str., Dist. 10, Ho Chi Minh City, Vietnam,Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc Dist., Ho Chi Minh City, Vietnam
| | - Nguyen Huu Huy Phuc
- Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Str., Dist. 10, Ho Chi Minh City, Vietnam,Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc Dist., Ho Chi Minh City, Vietnam,Corresponding author.
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Liu X, Guo B, Zhang L, Zhao S, dong Y, Zhao Z. Construction of a unique 2-D layered vanadoborate with water-assisted proton conductivity. NEW J CHEM 2022. [DOI: 10.1039/d2nj03124h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the present work, a new two-dimensional layered vanadoborate Na4[V12B18O54(OH)6(H2O)]•(H2en)4•2(OH)•3H2O (1, en = ethylenediamine), based on a [V12B18O54(OH)6(H2O)]10- cluster unit, was hydrothermally obtained and characterized. In the structure, the clusters...
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