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
Polymer Science
Gabriel D. Barbosa, C. Heath Turner
Summary: Ionenes are a class of ionic polymers with complex thermophysical behaviors, suitable for a wide range of applications. This study presents a new molecular model to accelerate research on these materials, potentially advancing the relevant fields.
Article
Chemistry, Multidisciplinary
Jun Zhang, Zhanying Chen, Yan Zhang, Shengyi Dong, Yufang Chen, Shiguo Zhang
Summary: By introducing alkoxy moieties into poly(ionic liquid)s, highly efficient adhesives with strong hydrogen bonding interactions can be designed, exhibiting excellent adhesive properties on various substrates. Furthermore, photosensitive or electronically conductive composite adhesives can be fabricated by utilizing the compatibility between ionic liquids and carbon nanotubes or silver nanofibers.
ADVANCED MATERIALS
(2021)
Article
Biochemistry & Molecular Biology
Danuta Kruk, Elzbieta Masiewicz, Sylwia Lotarska, Roksana Markiewicz, Stefan Jurga
Summary: The spin-lattice relaxation experiments of butyltriethylammonium bis(trifluoromethanesulfonyl)imide were analyzed in terms of relaxation pathways associated with different dipole-dipole interactions, revealing differences in translational diffusion coefficients between ions, especially at high temperatures. Moreover, correlation effects were observed in the translational dynamics of cation-cation pairs, becoming more pronounced at lower temperatures.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Thermodynamics
Kenneth R. Harris, Mitsuhiro Kanakubo, Daisuke Kodama, Takashi Makino, Yohei Mizuguchi, Yuki Suzuki, Tsutomu Watanabe
Summary: In this study, the viscosities of triethyloctylphosphonium bis(trifluoromethanesulfonyl)amide ([P222,8][Tf2N]) were measured as a function of temperature and pressure. The electrical conductivities and densities were also measured and compared with theoretical predictions.
JOURNAL OF CHEMICAL AND ENGINEERING DATA
(2023)
Article
Chemistry, Multidisciplinary
Kallidanthiyil Chellappan Lethesh, Ahmed Bahaa, Mariam Abdullah, Musbaudeen O. Bamgbopa, Rahmat Agung Susantyoko
Summary: The electrochemical stability of 22 commercially available hydrophobic ionic liquids was systematically studied for their application as electrolytes in supercapacitors under harsh weather conditions. The study measured the stability at different temperatures and evaluated the influence of cations, anions, and functional groups on the observed stability window, which ranged from 4.1 to 6.1 V.
FRONTIERS IN CHEMISTRY
(2022)
Article
Chemistry, Physical
Kenneth R. Harris, Mitsuhiro Kanakubo
Summary: This study reports new high-pressure self-diffusion data for an ionic liquid. The results indicate that the activation volumes of the cation and anion in the liquid are equal, suggesting similar mass transport behavior under pressure.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Physics, Multidisciplinary
Oriele Palumbo, Angelo Sarra, Jean-Blaise Brubach, Francesco Trequattrini, Adriano Cimini, Sergio Brutti, Giovanni Battista Appetecchi, Elisabetta Simonetti, Giovanna Maresca, Sebastien Fantini, Rongying Lin, Anais Falgayrat, Pascale Roy, Annalisa Paolone
Summary: In this study, two ethoxy containing ionic liquids (ILs) and their mixtures were investigated using differential scanning calorimetry and infrared spectroscopy combined with DFT calculations. Experimental results showed significant differences in thermal properties between the two ILs, with one undergoing crystallization and the other likely becoming a glass. Comparison with computational results indicated that hydrogen bonding was energetically favored in one IL but not in the other, and the presence of conformational disorder prevented the detection of clear hydrogen bonding in the latter. The mixtures rich in one IL crystallized at lower temperatures, and the energy gain from hydrogen bonding decreased as the concentration of the other IL increased.
FRONTIERS IN PHYSICS
(2022)
Article
Electrochemistry
Atsushi Kitada, Kio Kawata, Masahiro Shimizu, Masayuki Saimura, Takashi Nagata, Masato Katahira, Kazuhiro Fukami, Kuniaki Murase
Summary: This study reports a glyme-based electrolyte where ligand exchange conduction takes place. The experimental results indicate that the glyme chain length may need to be long enough to bridge Li+ ions, allowing the momentum exchange of Li+ ions via solvent molecules.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Hiroshi Abe, Yuto Yoshiichi, Hiroaki Kishimura
Summary: Hydrogen/deuterium exchange in hydrophobic ionic liquid-propanol solutions was investigated by Raman spectroscopy. The study found that the type of ionic liquid and additives had an influence on the H/D exchange process.
Article
Electrochemistry
Atsushi Kitada, Yoshiki Koujin, Masahiro Shimizu, Kio Kawata, Chiaki Yoshinaka, Masayuki Saimura, Takashi Nagata, Masato Katahira, Kazuhiro Fukami, Kuniaki Murase
Summary: The addition of LiTf2N to solvate ionic liquids significantly alters their electrolyte properties, leading to ligand exchange or hopping conduction of Li+ in super-concentrated electrolytes, resulting in a substantial increase in Li+ transference number. This study highlights the impact of segmental motion on the transport properties of glymes in the super-concentrated region.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Alessandro Triolo, Annalisa Paolone, Angelo Sarra, Francesco Trequattrini, Oriele Palumbo, Giovanni BattistaAppetecchi, Fabrizio Lo Celso, Philip Chater, Olga Russina
Summary: The chemical and physical properties as well as the structural features of a Protic Ionic Liquid (PIL) formed by neutralization of a super-strong base with a super-strong acid have been investigated in this study. The role of hydrogen bonding (HB) in affecting the morphology of the PIL has been highlighted, and a comparison between HB features in this PIL and related PILs has been presented. Differences in HB interaction have been observed and explained based on the geometrical properties of the main conformers contributing to the experimental spectra.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Multidisciplinary Sciences
Mohd Faridzuan Majid, Hayyiratul Fatimah Mohd Zaid, Muhammad Fadhlullah Abd Shukur, Azizan Ahmad, Khairulazhar Jumbri
Summary: In this study, the physicochemical properties and molecular interactions between zirconium-based metal-organic framework UiO-66 and three different ionic liquids based on bis(trifluoromethanesulfonyl)imide anion were investigated. The results showed that the ionic liquids were successfully incorporated into the micropores of UiO-66, and the interactions between the ionic liquids and UiO-66 were influenced by the alkyl chain length of the cation and the presence of electronegative atoms.
Article
Electrochemistry
Hiroyuki Ueda, Koichi Nishimori, Tomohiro Hisatomi, Yurika Shiraishi, Soichiro Yoshimoto
Summary: An electrochemical etching method for gold using [Tf2N](-) ionic liquids has been developed, which only requires one layer of iodine as a complexing ligand for gold dissolution and generation of gold nanoparticles. The voltammetric profiles of iodine-modified gold electrodes show that the electrochemical oxidation of gold is influenced by the type of halide ion and the crystallographic orientation of gold.
ELECTROCHIMICA ACTA
(2021)
Article
Polymer Science
Maxi Hoffmann, Ciprian Iacob, Gina Kaysan, Mira Simmler, Hermann Nirschl, Gisela Guthausen, Manfred Wilhelm
Summary: This study investigated the charge transport, diffusion properties, and glassy dynamics of blends of imidazolium-based ionic liquid and its corresponding polymer using PFG-NMR and rheo-BDS techniques. The results showed that the mechanical properties and ionic conductivity of the polymer blend were higher compared to the monomer, indicating substantial modifications of the mechanical properties. However, the charge transport was not significantly affected by the blending of components.
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, 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
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, Physical
Ryo Sumitani, Tomoyuki Mochida
Summary: Ionic liquid gels with photoswitchable ionic conductivity have versatile electronic applications and their physical properties can be reversibly controlled by light and heat, showing potential value in the field.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Physical
Ryo Sumitani, Tomoyuki Mochida
Summary: Ionic liquids containing cationic Ru sandwich complexes were studied for their diverse photochemical reactions. Different sulfur-containing substituents and anions were found to have significant effects on the physical properties and chemical reactivity of the ionic liquids. The study showed that the choice of substituents and anions can affect the phase behavior and reactivity of the ionic liquids.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
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.