Article
Chemistry, Multidisciplinary
Tomoyuki Mochida
Summary: Ionic liquids (ILs) with cationic metal complexes have unique physical properties and chemical reactivities. This review focuses on the molecular design, physical properties, and reactivities of organometallic ILs containing sandwich or half-sandwich complexes. It mainly covers stimuli-responsive ILs that can change their magnetic properties, solvent polarities, colors, or structures by external fields or reaction with coordinating molecules.
Article
Chemistry, Inorganic & Nuclear
Ryo Sumitani, Daisuke Kuwahara, Tomoyuki Mochida
Summary: Cationic rhodium complexes with 1,5-cyclooctadiene (cod) ligands were synthesized and their solid-state structures, thermal properties, and reactivities were investigated. The phase transitions of these salts resulted in disordered solid-state structures, with an increase in structural disorder as the cation symmetry decreased. FSA salts showed lower crystal symmetry and less cation disorder compared to SbF6 salts. Additionally, thermal stabilities and reactivities of these salts were studied, revealing different reactions upon melting for FSA and SbF6 salts.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Xiaoqing Yuan, Ju Liu, Jingyu Qin, Weili Ma, Guangyong Liu, Yanlei Wang, Hongyan He
Summary: By synthesizing polyetheramine-fatty acids (PEFA) ionic liquids (ILs) with dual stimuli-responsive ability to temperature and CO2, reversible phase transitions and droplet size changes were observed. The temperature response was dominated by the conformation of the polyetheramine chain in the cation, while the CO2-based reversible phase transition was controlled by the formation of bicarbonate and fatty acids (FA) from CO2 and the anion. Molecular simulations provided insights into the microscopic response mechanism of the IL-water system to temperature and CO2.
Article
Chemistry, Physical
O. Palumbo, A. Paolone, D. Rauber, C. W. M. Kay, F. Philippi, T. Welton
Summary: Mechanical spectroscopy measurements were conducted on ionic liquids with different cations and anions to analyze the relaxation processes. It was found that ILs with flexible anions exhibit distinct behavior in the liquid phase compared to ILs with rigid ions.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Inorganic & Nuclear
Jannick Guschlbauer, Tobias Vollgraff, Xiulan Xie, Ahmed Fetoh, Joerg Sundermeyer
Summary: A new high-yield synthesis method for tetraphenylphosphonium methylcarbonate Ph4P[OCO2Me] was reported in this study, demonstrating its synthetic value in preparing various Ph4P[anion] salts. The structural features and trends of the synthesized compounds were discussed in detail, showing potential applications in lanthanum complex synthesis.
DALTON TRANSACTIONS
(2021)
Article
Chemistry, Physical
Annalisa Paolone, Boumediene Haddad, Didier Villemin, Mostefa Boumediene, Bekhaled Fetouhi, Mohammed Amin Assenine
Summary: Four ionic liquids based on the NTf2 anion were synthesized and characterized. The ILs showed high thermal stability and could undergo crystallization or glass transition depending on the cation. The vapor pressure and vaporization enthalpy were measured, indicating their suitability for high temperature applications.
Article
Energy & Fuels
Yawei Miao, Zhenyong Wang, Cheng Chen, Xingdong Ding, Mengde Zhai, Licheng Liu, Ziyang Xia, Haoxin Wang, Ming Cheng
Summary: This study reports the use of an ionic liquid with multifunctional cations and Cl anion to improve the performance of FAPbI(3) solar cells. The treatment suppresses nonradiative recombination and phase transition in the perovskite film, leading to significantly improved efficiency and stability of the solar cells.
Article
Chemistry, Multidisciplinary
Chen Yuan, Wenyan Jia, Ziyun Yu, Yanan Li, Min Zi, Li-Ming Yuan, Yong Cui
Summary: This study demonstrates that two olefin-linked covalent organic frameworks (COFs) featuring chiral crown ether groups can be general chiral stationary phases (CSPs) for extensive separation in gas chromatography (GC) and both normal-phase and reversed-phase high-performance liquid chromatography (HPLC). These COFs show high stability under different chemical environments and have the ability for enantioselective recognition of guest molecules.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Physics, Multidisciplinary
Callum Gray, Steven T. Bramwell, Peter C. W. Holdsworth
Summary: The structure factor for electric field correlations in the two dimensional Coulomb fluid was simulated and compared to theories of the dielectric function. Singular changes in the structure factor were observed at different transition points, and differences were found between structure factors in different ensembles. Mechanisms of 'underscreening' and 'pinch point' scattering were identified, relevant to experiments on ionic liquids and artificial spin ice.
NEW JOURNAL OF PHYSICS
(2021)
Article
Chemistry, Physical
Gongyue Huang, Luca Porcarelli, Yan Liang, Maria Forsyth, Haijin Zhu
Summary: The study found that the composite with TFSI anion exhibited the best ion conductivity, while a synergistic effect was observed for the composite with both TFSI and OTf mixed anion, resulting in significantly enhanced ionic conductivity reaching 1.47 mS/cm. This work demonstrates the potential of using a combination of TFSI and OTf anions as an effective strategy for improving ionic conductivity in proton-exchange membranes.
ACS APPLIED ENERGY MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Emmanuel Pamete Yambou, Barbara Gorska, Francois Beguin
Summary: The electrical double-layer capacitors (EDLCs) performed effectively at low temperatures (-40°C) due to the tuned characteristics of the ionic liquid (IL) electrolyte and carbonaceous electrodes. The formulated ternary electrolyte showed low viscosity and high conductivity, remaining in a liquid state until it reached the glass transition at -99°C. Carbon electrodes with well-defined mesopores facilitated ion transport and high volumetric energy outputs of the cells.
Article
Chemistry, Physical
Shailesh Padsala, Vijay Patel, Debes Ray, Vinod K. Aswal, Pratap Bahadur
Summary: The micellization and microstructure of mixed micelles from mixtures of anionic and cationic surfactants were extensively studied, showing low CMC and large negative interaction parameter values due to synergism in the mixed systems. The thermodynamic parameters for mixed monolayers and micelles were evaluated. The influence of the ILs on micellar growth, shape changes, and transitions to vesicles was dependent on the surface activity of ILs.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Engineering, Environmental
Honghong Wang, Shangqing Chen, Yanan Dong, Jingjing Sun, Junfeng Wang, Yi Nie
Summary: The adsorption of metal ions from the cellulose spinning process-generated [Emim]Dep solution was studied using modified molecular sieves. The smaller size of 1.6 mm showed superior removal kinetic and selectivity for metal ions. Batch adsorption experiments showed high removal ratios for K+, Ca2+, Mg2+, Cu2+ and Zn2+, and the loss ratio of [Emim]Dep was below 0.7%. Fixed-bed adsorption experiments confirmed the long-term separation performance of metal ions from [Emim]Dep aqueous solution.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Chemistry, Inorganic & Nuclear
Koji Yamamoto, Tsuyoshi Sugawa, Mio Kondo, Shigeyuki Masaoka, Tetsuro Murahashi
Summary: The bridging coordination behavior of acenaphthylene to a Pd-3 or a Pd-4 cluster was investigated and elucidated by X-ray structure analysis, revealing different coordination modes in each cluster.
DALTON TRANSACTIONS
(2022)
Article
Biochemistry & Molecular Biology
Wei-dong Zhang, Yan Li, Ke Wang, Ye Yue, Mei Tie, Xue-jun Gu, You-lin Xue
Summary: This study used ionic liquids to extract cellulose-protein complexes (CPCs) from Se-enriched peanut leaf residue and compared the effects of different ionic liquids and organic solvents on the properties of CPCs.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2022)
Article
Chemistry, Multidisciplinary
Ibuki Nakamura, Ryo Sumitani, Tomoyuki Mochida
Summary: Nitro-nitrito isomerization, a well-known photoreaction in metal complexes, was studied in different packing environments using a cationic platinum(II) nitrito complex. The polymorphs of the salt exhibited various conversion rates at different temperatures, with the beta-form showing a space group change upon photoirradiation. A salt with the (CF3SO2)(2)N- anion displayed both crystalline and glassy states at low temperatures, with the crystalline state showing around 30% conversion at 100 K. Less densely packed crystals in these salts deteriorated upon photoirradiation.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Chemistry, Inorganic & Nuclear
Atsuhiro Miyawaki, Kazuo Eda, Tomoyuki Mochida, Takahiro Sakurai, Hitoshi Ohta, Takahito Nakajima, Kazuyuki Takahashi
Summary: The temperature-dependent study of magnetic susceptibility revealed a change in the spin-crossover transition behavior from abrupt to gradual conversions, with a recovery of the initial abrupt transition at room temperature. Variable-temperature crystal structures showed an SCO-triggered isomerization and relaxation of the azobenzene ligand, indicating a pedal-like motion of the ligand in the high-spin state but not in the low-spin state.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Inorganic & Nuclear
Tomoyuki Mochida, Syou Maekawa, Ryo Sumitani
Summary: A study was conducted to explore ionic liquids with stimuli-responsiveness based on linkage isomerization, resulting in the synthesis of an ionic liquid containing a cationic half-sandwich thiocyanate complex. The N- and S-coordinated isomers showed small solvatochromic absorption shifts in organic solvents, with different solvent dependencies observed for each isomer.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Thi Hien Thuy Nguyen, Chaolu Eerdun, Takuya Okayama, Satoshi Hisanaga, Takumi Tominaga, Tomoyuki Mochida, Jun-ichiro Setsune
Summary: This study discusses bimetallic complexes of hexapyrrole-alpha, omega-dicarbaldimines and their structure-property relationships. The complexes can adopt different structural forms depending on the conformation of the 2,2'-bipyrrole subunit, and reversible oxidation and spectroscopic changes were observed in experimental conditions.
JOURNAL OF PORPHYRINS AND PHTHALOCYANINES
(2022)
Article
Chemistry, Multidisciplinary
Hironori Kimata, Takashi Inagaki, Tomoyuki Mochida
Summary: The study compared the phase transitions and crystal structures of four Tf2N salts, all of which exhibited phase transitions at low temperatures with anion ordering. X-ray crystallography revealed that one of the salts had a symmetrical cation structure in the room-temperature phase, but an unsymmetrical structure in the low-temperature phase.
Article
Chemistry, Multidisciplinary
Sok-Yong Choi, Tomoyuki Mochida
Summary: A luminescent ionic liquid containing a cationic rhenium tricarbonyl complex was synthesized, and UV photoirradiation of this liquid in the presence of an organic solvent vapor caused a color change and luminescence quenching via photochemical ligand exchange, enabling the photocontrol of vapochromism.
Article
Chemistry, Inorganic & Nuclear
Shota Hamada, Tomoyuki Mochida
Summary: Ionic liquids containing cationic mixed-valence biferrocenylene derivatives were synthesized, and their melting points and temperature dependence were found to be related to the substituents on the cations.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Ryo Horikoshi, Ryo Sumitani, Natsuko Shimooka, Tomoyuki Mochida
Summary: This study focuses on the crystal structures, absorption wavelengths, and redox potentials of trinuclear complexes formed by ferrocene-based multidentate ligands and various transition-metal salts.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Tomoyuki Mochida, Yi Qiu, Ryo Sumitani, Hironori Kimata, Yoshitomo Furushima
Summary: Several meltable coordination polymers (CPs) with high flexibility and processability have been developed recently. However, the melting mechanism and vitrification conditions of these materials are not fully understood. In this study, meltable CPs incorporating ionic liquid components were synthesized and their crystal structures, melting behaviors, and vitrification upon rapid cooling were investigated.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Ryo Sumitani, Daisuke Kuwahara, Tomoyuki Mochida
Summary: Cationic rhodium complexes with 1,5-cyclooctadiene (cod) ligands were synthesized and their solid-state structures, thermal properties, and reactivities were investigated. The phase transitions of these salts resulted in disordered solid-state structures, with an increase in structural disorder as the cation symmetry decreased. FSA salts showed lower crystal symmetry and less cation disorder compared to SbF6 salts. Additionally, thermal stabilities and reactivities of these salts were studied, revealing different reactions upon melting for FSA and SbF6 salts.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Tomoyuki Mochida
Summary: Ionic liquids (ILs) with cationic metal complexes have unique physical properties and chemical reactivities. This review focuses on the molecular design, physical properties, and reactivities of organometallic ILs containing sandwich or half-sandwich complexes. It mainly covers stimuli-responsive ILs that can change their magnetic properties, solvent polarities, colors, or structures by external fields or reaction with coordinating molecules.
Article
Chemistry, Physical
Tomoyuki Mochida, Masato Shimada, Ryo Sumitani
Summary: Controlling the ionic conductivity of liquids is essential for electronic device applications, and we have developed metal-containing ionic liquids that exhibit reversible changes in ionic conductivity through UV photoirradiation and heating. The substituents in these liquids significantly affect the photochemical reaction, and by combining liquids with different reactivity, the conversions can be controlled. The ionic conductivity of these liquids undergoes reversible changes through successive photoirradiation-heating cycles, reflecting their photoreactivity.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Multidisciplinary
Tomoyuki Mochida, Syou Maekawa, Ryo Sumitani
Summary: Cp Ru complexes can be synthesized into Ru-containing ionic liquids (ILs) that exhibit diverse physical and chemical properties depending on the auxiliary ligand. These ILs can undergo in situ ligand exchange, allowing for interconversions between different ligands.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Tomoyuki Mochida, Yi Qiu, Yusuke Funasako, Makoto Inokuchi, Mariko Noguchi, Hiroki Fujimori, Yoshitomo Furushima
Summary: A 2D coordination polymer containing an ionic liquid was synthesized via a solvent-free reaction. The material exhibited unique melting properties and underwent solid-liquid phase transitions at different temperatures. Rapid cooling resulted in complete vitrification.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Ryo Sumitani, Masamichi Yamanaka, Tomoyuki Mochida
Summary: In this study, we developed organometallic compounds that release low-molecular-weight gelators upon photoirradiation, and successfully achieved photogelation of ionic liquids. The gelled ionic liquids underwent reversible reaction upon heating, and the photogelation was repeatable for ILs with coordinating cations.
