Article
Chemistry, Inorganic & Nuclear
Gege Qiu, Donglin Diao, Leo Chaussy, Sabine Michaud-Chevallier, A. Jalila Simaan, Paola Nava, Alexandre Martinez, Cedric Colomban
Summary: In this study, a capped bioinspired ligand with a tris(2-pyridyl-methyl)amine (TPA) unit and a triazole-based intramolecular H-bonding secondary sphere was synthesized. The resulting cage has a well-defined cavity and combines hydrophobic nature with H-bonding properties.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Multidisciplinary
Ryo Watari, Yoshihito Kayaki
Summary: A series of protic amines containing cyclic amidine substituents were synthesized and reacted with MnBr(CO)(5) to form cationic mononuclear Mn(i) complexes with a facial coordination mode. The amidine side arm was found to possess a strong electron donating ability, and one of the complexes exhibited high catalytic activity in the transfer hydrogenation of acetophenone. The redox properties of the complexes varied depending on the structure of the amidine, with a Mn complex featuring readily accessible electron acceptance showing significant current increase under CO2, indicating catalytic activity in CO2 electrochemical reduction.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Joydeb Goura, James McQuade, Daisuke Shimoyama, Roger A. Lalancette, John B. Sheridan, Frieder Jakle
Summary: This study demonstrates new reactivity patterns at the bridgehead positions of a ruthenium tris(pyrid-2-yl)borate complex, allowing for easy tuning of its steric and electronic properties.
CHEMICAL COMMUNICATIONS
(2022)
Article
Chemistry, Organic
Ju Ho Yang, Jaehyeon Kim, Benjamin P. Hay, Kyounghoon Lee, Sung Kuk Kim
Summary: Tripodal ion pair receptors 1 and 2 have been synthesized and shown to selectively bind with LiCl ion pairs. The H-1 NMR spectroscopic analyses combined with molecular mechanics calculations reveal that the lithium cation is bound to the receptor while the chloride anion interacts with the NHs of urea or amido indole groups via hydrogen bonds. Addition of fluoride releases the lithium cation from the receptors, while chloride and bromide form ion pair complexes with lithium.
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Yida Zhang, Qingyu Wang, Shaokang Yang, Hengwei Wang, Dewei Rao, Tao Chen, Gongming Wang, Junling Lu, Junfa Zhu, Shiqiang Wei, Xusheng Zheng, Jie Zeng
Summary: This study demonstrates that the strong interaction between Ru single atoms and the second coordination sphere can enrich photogenerated electrons at Ru active sites and enhance N-2 photofixation activity. Mechanistic studies reveal that Ru-Co coordination serves as an additional photoelectron transfer channel, facilitating the photoreduction of N-2 into NH3.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Inorganic & Nuclear
Mitchell J. Demchuk, Joseph A. Zurakowski, Marcus W. Drover
Summary: The selective forging of carbon-boron bonds via C-H borylation can be achieved through the strategic placement of Lewis acids in the ligand periphery, allowing for mechanistic control. The researchers prepared various diphosphine iridium complexes with different ligands and showed that the P2B4Cy ligand scaffold with Lewis acidic boron groups can engage with N-heterocycles. The study also compared the catalytic borylation of 2-methylpyridine using different combinations of iridium salts and diphosphine ligands.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Tiansi Xin, Xinrui Wang, Kexin Yang, Jiefeng Liang, Wenliang Huang
Summary: A new tripodal tris(amido) ligand system with an arene anchor was developed and applied to the coordination chemistry of rare earth metals. The mononuclear rare earth metal complexes were prepared in moderate to good yields through salt metathesis and alkane elimination reactions. The rare earth metal complexes displayed a trigonal planar coordination geometry in the solid state, different from the commonly observed trigonal pyramidal geometry.
INORGANIC CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Daniel M. Beagan, John J. Kiernicki, Matthias Zeller, Nathaniel K. Szymczak
Summary: We propose a ligand platform with appended ditopic Lewis acids for the capture/activation of diatomic substrates. Incorporation of two 9-borabicyclo[3.3.1]nonane (9-BBN) units on a carbon tethered to a pyridine pyrazole scaffold allows for coordination of Fe-II, Zn-II, and Ni-II. The additive effect of ditopic boranes compared to monotopic analogues is demonstrated through hydride ion affinity and competition experiments. The platform achieves high selectivity for binding NO2- in the presence of competitive anions and enables unique activation pathways for hydrazine capture.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Electrochemistry
Laureline Lecarme, Aurelie Niyongabo, Frederic Lafolet, Fannie Alloin, Wayne E. Jones, Jean-Claude Lepretre
Summary: Functionalization of a carbon electrode through the electrochemical reduction of ruthenium tris-bipyridine diazonium salts prepared in situ allows determination of anion nature in lithium and sodium battery electrolyte, detecting the presence of PF6- and ClO4- anions as well as fluoride anions from PF6- degradation. The study found a linear relationship between the current response and F- concentration, which has been applied to aging battery electrolyte to confirm the low solubility of LiF. This behavior could aid in analyzing electrolytes from the recycling sector.
ELECTROCHEMISTRY COMMUNICATIONS
(2021)
Article
Chemistry, Inorganic & Nuclear
Shourya Gupta, Sumangla Arora, Aditesh Mondal, S. Chantal E. Stieber, Puneet Gupta, Subrata Kundu
Summary: Nitrous acid (HONO) plays important roles in biogeochemistry, atmospheric chemistry, and mammalian physiology. This study successfully isolated a copper(II) complex with nitrite and investigated its reactivity in anaerobic nitration reactions. The reactivity of this complex is different from closely related copper(II)-nitrite complexes.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Jin Wang, Peter C. Ho, Matthew G. J. Craig, Alberto Cevallos, James F. Britten, Ignacio Vargas-Baca
Summary: Studies have been conducted on the supramolecular chemistry of iso-tellurazole N-oxides in non-polar media. However, this study introduces a derivatized iso-tellurazole N-oxide that is soluble in polar solvents and stable in aqueous media. The compound forms macrocyclic complexes with nickel (II) and iron (II) through CTe...O chalcogen bonds and kappa(6)-O bound to the metal ion, which is different from the complexes formed by soft metal ions.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Inorganic & Nuclear
Alberto Gobbo, Xinyuan Ma, Gianluca Ciancaleoni, Stefano Zacchini, Lorenzo Biancalana, Massimo Guelfi, Guido Pampaloni, Steven P. Nolan, Fabio Marchetti
Summary: The potential of ruthenium(II) arene complexes in catalytic transfer hydrogenation has been widely investigated, but studies on homologous compounds with tris(1-pyrazolyl)methane (tpm) ligand are lacking. In this study, RuCl(kappa(3)-tpm)(PPh3)(2)]Cl reacted with various nitrogen ligands to form [RuCl(kappa(3)-tpm)(PPh3)(L)]Cl (L=NCMe, NCPh, imidazole) in nearly quantitative yields. These complexes were evaluated as catalytic precursors in the transfer hydrogenation of ketones, and complex 2 exhibited the highest activity.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Inorganic & Nuclear
Sayontani Sinha Roy, Kallol Talukdar, Sha Tamanna Sahil, Jonah W. Jurss
Summary: Properly positioned second-coordination sphere functional groups play a crucial role in enhancing catalytic activity, altering product selectivity, and reducing the energy cost for desired chemical transformations. By investigating Re(bpy) catalysts with second-sphere tertiary amine groups, we found that the DMA-substituted tertiary amine complexes show the highest turnover frequency and turnover number, and the catalysis is predominantly governed by inductive electronic effects.
Article
Chemistry, Medicinal
Jakub Cervinka, Alberto Gobbo, Lorenzo Biancalana, Lenka Markova, Vojtech Novohradsky, Massimo Guelfi, Stefano Zacchini, Jana Kasparkova, Viktor Brabec, Fabio Marchetti
Summary: A new ruthenium(II) complex containing a tridentate tris(1-pyrazolyl)methane ligand was synthesized and reacted with a series of organic molecules to form novel complexes. These complexes showed promising anti-cancer activity and selectivity toward cancer cells, with the mechanism of action being the inhibition of mitochondrial calcium intake. The complexes exhibited good solubility in water and could accumulate effectively in cancer cells.
JOURNAL OF MEDICINAL CHEMISTRY
(2022)
Review
Crystallography
Edward R. T. Tiekink
Summary: A survey of the Cambridge Structural Database revealed 41 crystals with secondary bonding of IMIDLINE HORIZONTAL ELLIPSISBr in their supramolecular assemblies, categorized into zero-dimensional and one-dimensional aggregates based on topology.
Article
Polymer Science
Kazushi Shibutani, Jun Nakai, Ketkanok Aphichartsuphapkhajorn, Yoshihito Kayaki, Shigeki Kuwata, Yoshihiko Arao, Masatoshi Kubouchi
Summary: The research demonstrates that oxygen and additional oxygen providers serve as activators for furfuryl alcohol polymerization, accelerating the construction of a conjugated structure and enhancing the mechanical properties of the cured resin.
JOURNAL OF APPLIED POLYMER SCIENCE
(2021)
Article
Chemistry, Inorganic & Nuclear
Yohei Kashiwame, Takao Ikariya, Shigeki Kuwata
Summary: A series of iridium complexes with pyrazole ligands were synthesized and their reaction characteristics were explored under different reaction conditions, with their structures characterized.
Article
Polymer Science
Takuma Hanaoka, Yoshihiko Arao, Yoshihito Kayaki, Shigeki Kuwata, Masatoshi Kubouchi
Summary: Nitric acid decomposition is an effective method for recycling epoxy resin, with the chemical structure of the resin affecting the decomposition process; this study is the first systematic investigation into the relationship between chemical structure and decomposition.
POLYMER DEGRADATION AND STABILITY
(2021)
Article
Chemistry, Inorganic & Nuclear
Tatsuro Toda, Shigeki Kuwata
Summary: The synthesis and properties of polyprotic NNN pincer-type bis(pyrazole) iron complexes derived from a 1,3-bis(pyrazol-3-ylimino)isoindoline 1 were investigated. Various iron complexes were synthesized under different conditions, and the structures of the ligands were compared in details. The NH groups in the pincer ligand in the complexes showed their Bronsted acidic nature and some of the complexes exhibited catalytic activity for the disproportionation of hydrazine.
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
(2021)
Article
Chemistry, Multidisciplinary
Takuma Hanaoka, Yoshihiko Arao, Yoshihito Kayaki, Shigeki Kuwata, Masatoshi Kubouchi
Summary: A new method for recycling decomposed amine-cured epoxy resin as a curing agent was developed in this study. The recycled resin exhibited higher tensile strength and comparable tensile modulus due to the presence of aromatic amino groups. By replacing a portion of the original curing agent, the optimized formulation of the recycled resin showed tensile strength comparable to that of the virgin resin.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Polymer Science
Atsuko Tabuchi, Teruaki Hayakawa, Shigeki Kuwata, Ryohei Ishige, Shinji Ando
Summary: By synthesizing N-cyclohexylphthalimide-substituted compounds, bright yellow fluorescence was observed in solution and crystalline states. Through substitution strategies, the resulting PI films displayed bright white fluorescence with a 1.7-fold increase in quantum yield.
Article
Materials Science, Multidisciplinary
Yoko Nambu, Yoko Yoshitake, Shohan Yanagi, Kenji Mineyama, Keisuke Tsurui, Shigeki Kuwata, Toshikazu Takata, Tadatomi Nishikubo, Ken Ishikawa
Summary: Dinaphtho[2,1-b:1 ',2 '-d]thiophene (DNT) is an organic high refractive index material with unique properties attributed to its flexible dynamic thiahelicene structure, allowing for metastable film-forming ability, high transparency, and high compatibility with PMMA. Chemical modification of DNT yields vinyl polymers with high refractive indices, demonstrating its potential as a promising candidate for organic polymeric high refractive index materials.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Naiqiang Liang, Shigeki Kuwata, Ryohei Ishige, Shinji Ando
Summary: A novel imide compound and polyimides with multiple intramolecular hydrogen bonds were synthesised to investigate the effects of distinct H-bond structures on photoluminescence properties, revealing excited-state intramolecular proton transfer as the main luminescence mechanism. These compounds show promise for solar spectral conversion applications.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Chemistry, Inorganic & Nuclear
Takuya Harada, Shinji Ando, Shigeki Kuwata
Summary: A ruthenium complex with an o-benzoquinone dioximate dianion was isolated, and the redox chemistry of its ligand was elucidated. The complex underwent ligand exchange and oxidation reactions, and the reduced ligand was regenerated through a catalytic reduction process with the aid of a base.
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
(2022)
Correction
Chemistry, Multidisciplinary
Takuma Hanaoka, Yoshihiko Arao, Yoshihito Kayaki, Shigeki Kuwata, Masatoshi Kubouchi
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Chemistry, Organic
Takuma Kawada, Kenya Yabushita, Toshihisa Yasuda, Takeshi Ohta, Takaaki Yajima, Kouichi Tanaka, Noriyuki Utsumi, Masahito Watanabe, Kunihiko Murata, Yoshihito Kayaki, Shigeki Kuwata, Takeaki Katayama
Summary: Convenient asymmetric reductive amination of benzylic ketones was developed using newly designed Cp*Ir complexes as catalysts. The reaction produced a range of benzo-fused and acyclic ketones with high chemo- and diastereoselectivities, using readily available beta-amino alcohols as chiral aminating agents. The catalytic performance remained excellent even at a low catalyst dosage, and the reaction could be scaled up to over 100 g.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Hiroki Sato, Tadashi Tsukamoto, Hiromitsu Sogawa, Shigeki Kuwata, Toshikazu Takata
Summary: The study synthesized ruthenium complexes with a cavity-containing ligand and characterized their structures. Different types of pincer-type ligands were used during the synthesis, forming different complexes through thermal ligand exchange of CO with phosphorus ligands. The experimental results showed that these complexes exhibited catalytic activity and performed well in the hydrosilylation reaction.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Multidisciplinary
Hiroki Sato, Tadashi Tsukamoto, Hiromitsu Sogawa, Shigeki Kuwata, Toshikazu Takata
Summary: Ruthenium complexes with pincer-type ligands were synthesized and characterized, and their structures and catalytic activities were studied.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Materials Science, Multidisciplinary
Atsuko Tabuchi, Teruaki Hayakawa, Shigeki Kuwata, Ryohei Ishige, Shinji Ando
Summary: A multi-colour solvatochromic fluorophore was developed, showing bright fluorescence in a full-colour range in different organic solvents and having potential applications in organic electronic devices and biological imaging tools.
MATERIALS ADVANCES
(2021)
Article
Chemistry, Multidisciplinary
Hitomi Nakamura, Minori Yoshida, Asuka Matsunami, Shigeki Kuwata, Yoshihito Kayaki
Summary: A novel bifunctional iridium catalyst with a 1,2-diphenylethylenediamine framework and an ethereal tether chain was successfully synthesized. This catalyst showed enhanced durability and complete conversion in catalytic hydrogen generation from formic acid.
CHEMICAL COMMUNICATIONS
(2021)
