Article
Chemistry, Physical
Fadhila Rabhi, Thomas Di Pietro, Fabrice Mutelet, Hocine Sifaoui
Summary: This study focused on the extraction of three organic compounds from aqueous solutions using an ionic liquid. The liquid-liquid equilibrium was measured and predicted, and the experimental data showed that the ionic liquid is suitable for the extraction of organic compounds. This research has significant implications for the application of ionic liquids in organic chemistry.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Energy & Fuels
Yifeng Chen, Shuailong Song, Ning Li, Jian Wu, Xiaohua Lu, Xiaoyan Ji
Summary: The development of a novel absorbent for CO2 separation technology was investigated in this study. The experimental results showed that the developed technology had a significantly higher CO2 mass-transfer rate and lower cost compared to current commercialized technology. The absorption ability index successfully predicted the performance of CO2 separation technologies.
Article
Chemistry, Multidisciplinary
Jan Blasius, Barbara Kirchner
Summary: Chirality transfer is observed from (R)-1,2-propylene oxide to the achiral anion of the 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquid. This observation is important as it demonstrates selectivity and shows that anion effects are predominant in this system. Molecular dynamics simulations and spectroscopic analysis reveal an excess of one conformer in the presence of the chiral solute, leading to optical activity of the anion.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Thermodynamics
Rui-Jie Xu, Shang-Hao Liu, Ke-Fan Wu, Chang-Fei Yu
Summary: Coal spontaneous combustion endangers the safety of the coal industry and results in the emission of a large amount of carbon dioxide, which poses a threat to the ecological environment. This study demonstrates that ionic liquid can be used as a flame retardant to inhibit the spontaneous combustion of coal.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Chemistry, Physical
Marcin Gano, Joanna Klebeko, Robert Pelech
Summary: This study investigated the potential application of bis(trifluoromethylsulfonyl)imide based ionic liquids paired with various cations for the esterification of curcumin, showing that the product of curcumin diacetate (DAC) can be obtained at moderate conditions without the use of organic solvents. The presence of IL in the reaction system accelerates the achievement of chemical equilibrium and increases the reaction rate.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Thermodynamics
Dorota Warminska, Iwona Cichowska-Kopczynska
Summary: This work investigates the physicochemical properties of three binary mixtures containing ionic liquids mixed with 2-propanol. The effects of temperature, cation, and anion on properties such as density, speed of sound, refractive index, and viscosity were analyzed. Excess properties were calculated and correlated with composition data using the Redlich-Kister polynomial equation.
JOURNAL OF CHEMICAL THERMODYNAMICS
(2022)
Article
Chemistry, Physical
Aycan Altun, Osman Nuri Sara
Summary: In this study, the densities and viscosities of binary mixtures of 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl) imide, [bmim][NTf2], and ethylene glycol (EG) were experimentally measured. A first-order polynomial and Vogel-FulcherTammann equation were used to estimate the densities and viscosities of the mixtures, respectively. The excess molar volume, viscosity, and Gibbs energy of activation for viscous flow were calculated and fitted to the Redlich-Kister equation. The thermal expansion coefficients and partial and apparent molar volumes of [bmim][NTf2] and EG in their binary mixtures were also investigated.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Geochemistry & Geophysics
Ting Liu, James C. Hower, Ching-Hua Huang
Summary: Previous studies have shown that rare earth elements (REEs) can be extracted from coal fly ash (CFA) using a recyclable ionic liquid. The method involves heating the IL-CFA suspension and selectively separating the REEs. Acid stripping removes the REEs, allowing for the reuse of the IL. This study demonstrates the applicability and effectiveness of this method for recovering REEs from different types of CFA.
Article
Thermodynamics
Jan Pavlicek, Grozdana Bogdanic, Ivan Wichterle
Summary: In this study, vapor-liquid equilibrium data near azeotropic points of the title system were measured at different temperatures. A newly-developed method based on relatively small amounts of input data was used to process the data, providing a thermodynamic description of azeotropic behavior.
FLUID PHASE EQUILIBRIA
(2022)
Article
Chemistry, Physical
Hong Chen, Zonghua Wang, Xianzhen Xu, Shida Gong, Zhiwu Yu, Yu Zhou
Summary: This study investigated the hydrogen bonding interactions between ether-functionalized IL and co-solvents at different concentrations using FTIR, excess infrared spectroscopy, and quantum chemical calculations. It was found that the strength of hydrogen bonds increased during dilution with co-solvents, with the EOMIMTFSI-DMSO system exhibiting the strongest interactions. The main interaction sites and types varied among the studied systems, providing insights into the microscopic properties of ether-functionalized ILs.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Chemistry, Physical
Alireza Mohsenipour, Mehrdad Mozaffarian, Gholamreza Pazuki, Leila Naji
Summary: This paper outlines the construction of symmetric supercapacitors using reduced graphene oxide and ionic liquid, with the best solvents selected through analysis. The experiments show that the use of 80% IL in the electrolyte leads to optimal electrochemical performance and capacitance results.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Multidisciplinary
Jaeseong Lee, Melissa Fairley, George S. Goff, Joan F. Brennecke
Summary: This study focuses on the use of ionic liquids (ILs) as extractants for metal separation. It is found that the previously undetected neutral zwitterionic betaine formed during the IL synthesis can affect the liquid-liquid phase behavior. Traditional synthesis methods result in the presence of significant amounts of neutral zwitterionic betaine impurity, which greatly impacts the phase behavior.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Ayan Ghosh, Amit Pandey, Arijit Sengupta, Velavan Kathirvelu, Sarvesh S. Harmalkar, Sunder N. Dhuri, Keisham S. Singh, Tapan K. Ghanty
Summary: Novel amide ligands in ionic liquid were used for the liquid-liquid biphasic mass transfer of Eu3+ ions. Cation exchange mechanism was found to be operative, but the presence of an inner-sphere water molecule was revealed. Viscosity-induced slower kinetics was improved by increasing temperature. The process was exothermic and showed spontaneity and increased entropy.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Hui Liu, Weichen Zhu, Hongyan Zhou, Jianzhong Wang
Summary: The redox reactions of polymeric active materials can alleviate the self-discharge effect and dissolution of anode active materials in metal-free dual-ion batteries, improving their coulombic efficiency and capacity retention rate.
Article
Thermodynamics
Yifeng Chen, Zhengxing Dai, Xiaoyan Ji, Xiaohua Lu
Summary: This study measured CO2 solubilities in different hybrid absorbents, quantifying the contribution of the confinement effect and establishing the relationship between surface roughness and molecular parameters. The results showed that a specific hybrid absorbent is promising for CO2 separation based on CO2 absorption capacity and enthalpy.
FLUID PHASE EQUILIBRIA
(2021)
Article
Nuclear Science & Technology
Soma Kono, Tsuyoshi Arai, Koichiro Takao
Summary: The temperature-dependent back-extraction behavior of inert platinum group metals Ru(III) and Rh(III) has been investigated, showing that the stripping efficiency of Rh(III) increases with temperature. In contrast, Pd(II) can be efficiently stripped at lower temperatures.
JOURNAL OF NUCLEAR SCIENCE AND TECHNOLOGY
(2021)
Article
Chemistry, Inorganic & Nuclear
Tomoyuki Takeyama, Satoru Tsushima, Koichiro Takao
Summary: Uranyl(VI) complexes with pentadentate N3O2-donating Schiff base ligands containing various substituents at the ortho and/or para positions on phenolate moieties were synthesized and characterized, showing that the electron-withdrawing nature of substituents affects their redox behavior. Regardless of the substituents, the center U6+ of each complex undergoes one-electron reduction to form uranyl(V) complexes, indicating that the redox active center of uranyl(VI) complexes is determined by the electronic structure rather than the redox potentials.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Physical
Satoru Tsushima, Koichiro Takao
Summary: Cyclic peptides and modified EF-hand motif of calmodulin have been designed to enhance their affinity towards uranyl(vi). Cyclic peptides can bind uranyl(vi) to its backbone under acidic conditions, while the modified EF-hand motif of calmodulin achieves high affinity through electrostatic interactions and formation of hydrophobic cores.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Inorganic & Nuclear
Takumi Mizumachi, Minami Sato, Masashi Kaneko, Tomoyuki Takeyama, Satoru Tsushima, Koichiro Takao
Summary: Water-compatible ligands H2saldian and its derivatives were designed for strong and selective capture of UO22+ in seawater. The complexation ability of saldian2 with UO22+ was much higher than traditional ligand systems commonly used for U extraction from seawater. Good selectivity for UO22+ from other metal ions coexisting in seawater was also demonstrated.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Analytical
Koichiro Takao, Taro Tsubomura
Summary: An optically transparent thin-layer electrode (OTTLE) cell compatible with both absorption and luminescence spectroelectrochemistry was developed and its effectiveness was demonstrated through experiments in both absorption and luminescence spectroelectrochemistry.
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Ryoma Ono, Hiroyuki Kazama, Juliane Marz, Satoru Tsushima, Koichiro Takao
Summary: In this study, we investigated the molecular and crystal structures of Ce(IV) compounds deposited under different [HNO3] conditions. We found that these compounds exhibit different crystalline phases depending on the concentration of HNO3. The different Ce(IV) phases can exchange with each other in HNO3(aq), indicating parallel dissolution/deposition, hydrolysis and oxolation, and complexation with NO3-.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
Tomoyuki Takeyama, Juliane Maerz, Ryoma Ono, Satoru Tsushima, Koichiro Takao
Summary: NpO2(NO3)(2) units are connected by bis(2-pyrrolidone) linker molecules with the trans-1,4-cyclohexyl bridging part (L1) to form a one-dimensional coordination polymer, [NpO2(NO3)(2)(L1)](n). The molecular and crystal structures of this compound are similar to that of the UO22+ analogue, but its aqueous solubility is greatly enhanced, possibly due to weaker thermodynamic stability of NpO22+ complexation compared with UO22+.
Article
Chemistry, Multidisciplinary
Tomoyuki Takeyama, Satoru Tsushima, Robert Gericke, Peter Kaden, Juliane Maerz, Koichiro Takao
Summary: In this study, the formation of a Np-IV complex from the direct complexation-induced chemical reduction of (NpO22+)-O-VI was reported for the first time. In contrast, the complexation of (UO22+)-O-VI with tBu-pdiop(2-) did not induce its reduction, even after two-electron electrochemical reduction. The difference between Np and U systems can be attributed to the decrease in energy of the 5 f orbitals in Np compared to U. These findings highlight the need to differentiate the redox chemistry between (UO22+)-O-VI and (NpO22+)-O-VI in redox-active ligand systems.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Masanori Yamamoto, Yota Takamura, Yoshiaki Kokubo, Makoto Urushihara, Nobutake Horiuchi, Wenbin Dai, Yuichiro Hayasaka, Eiji Kita, Koichiro Takao
Summary: In this study, the conversion of iron(II) chloride to magnetite was investigated under inert atmosphere, revealing different reaction steps at high temperatures and successfully synthesizing meta-stable magnetite instead of thermodynamically stable hematite.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Hirokazu Narita, Motoki Maeda, Chiharu Tokoro, Tomoya Suzuki, Mikiya Tanaka, Hideaki Shiwaku, Tsuyoshi Yaita
Summary: In this study, the mechanism of Se(iv) and Se(vi) extraction from aqueous HCl solutions by EHBAA was investigated. The extraction behavior and structural properties of the dominant Se species in solution were examined. It was found that Se(vi) was reduced to Se(iv) in 8 M HCl, and around 50% of Se(vi) was extracted from 0.5 M HCl using 0.5 M EHBAA. On the other hand, Se(iv) was hardly extracted from 0.5 to 5 M HCl, but the extraction efficiency increased drastically above 5 M, reaching approximately 85%. The apparent stoichiometries of Se(iv) or Se(vi) to EHBAA were 1:1 and 1:2, respectively.
Review
Chemistry, Inorganic & Nuclear
Koichiro Takao
Summary: Nuclear power is a viable and proven carbon-free energy source that can provide baseload electricity to meet the demands of the current society. However, there are complex issues such as resource security, depleted uranium, and disposal of high-level radioactive waste. Chemistry plays a crucial role in addressing these problems and guiding fundamental research in this field.
DALTON TRANSACTIONS
(2023)
Article
Chemistry, Inorganic & Nuclear
Tomoyuki Takeyama, Satoru Tsushima, Koichiro Takao
Summary: The redox activity of a (UO22+)-O-VI complex is usually considered as a metal-centered phenomenon due to the small energy gaps of uranium. In this study, three (UO22+)-O-VI complexes with different ligands were synthesized, and their redox properties were investigated. The results showed that the ligands were redox-active, while the (UO22+)-O-VI center remained unchanged during the redox processes. This study provides insights into the design of new uranium molecular catalysts and magnetic materials.
INORGANIC CHEMISTRY FRONTIERS
(2023)
Article
Chemistry, Multidisciplinary
Naoki Yamato, Noriaki Kumagai, Momoha Okahira, Satoru Kosaka, Shuji Kodama, Ryohei Yamamoto, Atsushi Yamamoto, Koichiro Takao, Masanori Yamamoto
Summary: The anticancer therapeutic leuprorelin, when functionalized into a mesoporous polymer, showed excellent affinity to the carcinogen ochratoxin A (OTA). This interaction was further confirmed with DFT calculations and successfully utilized for the extraction of OTA from heavily fatty matrices.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Tomoyuki Takeyama, Koichiro Takao
Summary: Uranyl(vi) complexes with different Schiff base ligands were synthesized and characterized. The properties of the complexes were found to be influenced by the nature of the ligand donor atoms, as confirmed by various experimental and theoretical analyses. These findings provide valuable insights into the structure and properties of uranium compounds.
Article
Chemistry, Inorganic & Nuclear
Tomoyuki Takeyama, Satoshi Iwatsuki, Satoru Tsushima, Koichiro Takao
Summary: In this study, a uranyl(vi) complex with novel reactivity was synthesized and characterized. Through kinetic analysis and mechanistic studies, the process of hydrogen atom transfer from an amino group in the complex was revealed, leading to the formation of another complex. These findings provide new insights for utilizing uranyl(vi) complexes as catalysts in thermally-driven molecular conversion systems.
DALTON TRANSACTIONS
(2022)
