| 1. |
Daiki Shimauchi, Takeshi Yatabe, Yuka Ikesue, Yuu Kajiwara, Taro Koide, Tatsuya Ando, Ki-Seok Yoon, Hidetaka Nakai, Seiji Ogo, Storing electrons from H2 for transfer to CO2, all at room temperature, Chemical Communications, 10.1039/d3cc05285k, 59, 14795-14798, 2023.12, An H2-derived energy carrier that stores electrons from H2 at room temperature and transfers them to CO2 at leisure at room temperature.. |
| 2. |
Chiaki Takahashi, Takeshi Yatabe, Hidetaka Nakai, Seiji Ogo, Single‐Step Synthesis of NiI from NiII with H2, Chemistry – A European Journal, 10.1002/chem.202302297, 29, 69, 2023.10, Abstract
Chemists have long sought to regulate the reactivity of H2, to yield hydride ions, hydrogen atoms, or electrons on demand. One source of inspiration for achieving this control is [NiFe]hydrogenase ([NiFe]H2ase), which reacts with H2 to form various hydrogen active species such as NiIII hydride species, NiII hydride species, and NiI low‐valent species. Chemists have attempted to synthesize these hydrogen active species not only as models for the active species of [NiFe]H2ase, but also as electron transfer catalysts. However, the synthesis of NiI complex directly from H2 has not been reported. This paper reports the first example of a single‐step synthesis of a NiI complex, via reaction of a NiII complex with H2, stable for over 3 months at room temperature and we further demonstrate a reductive coupling of acridinium ions as part of a reaction cycle.. |
| 3. |
Seiji Ogo, Takeshi Yatabe, Keishi Miyazawa, Yunosuke Hashimoto, Chiaki Takahashi, Hidetaka Nakai, Yoshihito Shiota, Cyclopropanation Using Electrons Derived from Hydrogen: Reaction of Alkenes and Hydrogen without Hydrogenation, JACS Au, 10.1021/jacsau.4c00098, 2024.03. |
| 4. |
Yamada, Kaho; Yatabe, Takeshi; Yoon, Ki-Seok;* Ogo Seiji.*, Cp*Ir Complex with Mesobiliverdin Ligand Isolated from Thermoleptolyngbya sp. O-77, Journal of Organometallic Chemistry, 964, 122302, 2022.02. |
| 5. |
Seiji Ogo, Takahiro Kishima, Takeshi Yatabe, Keishi Miyazawa, Ryunosuke Yamasaki, Takahiro Matsumoto, Tatsuya Ando, Mitsuhiro Kikkawa, Miho Isegawa, Ki-Seok Yoon, Shinya Hayami, [NiFe], [FeFe], and [Fe] hydrogenase models from isomers., Science advances, 10.1126/sciadv.aaz8181, 6, 24, eaaz8181, 2020.06, The study of hydrogenase enzymes (H2ases) is necessary because of their importance to a future hydrogen energy economy. These enzymes come in three distinct classes: [NiFe] H2ases, which have a propensity toward H2 oxidation; [FeFe] H2ases, which have a propensity toward H2 evolution; and [Fe] H2ases, which catalyze H- transfer. Modeling these enzymes has so far treated them as different species, which is understandable given the different cores and ligand sets of the natural molecules. Here, we demonstrate, using x-ray analysis and nuclear magnetic resonance, infrared, Mössbauer spectroscopies, and electrochemical measurement, that the catalytic properties of all three enzymes can be mimicked with only three isomers of the same NiFe complex..  |
| 6. |
Makoto Takenaka, Mitsuhiro Kikkawa, Takahiro Matsumoto, Takeshi Yatabe, Tatsuya Ando, Ki Suk Yoon, Seiji Ogo, Oxidation of Guanosine Monophosphate with O 2 via a Ru-peroxo Complex in Water, Chemistry - An Asian Journal, 10.1002/asia.201801267, 13, 21, 3180-3184, 2018.11, Oxidative damage of DNA by reactive oxygen species (ROS) is responsible for aging and cancer. Although many studies of DNA damage by ROS have been conducted, there have been no reports of the oxidation of RNA components, such as guanosine monophosphate, by metal-based species in water. Here, we report the first case of oxidation of guanosine monophosphate to 8-oxoguanosine monophosphate by a metal-based oxygen bound species, derived from O
2
and in water.. |
| 7. |
Yuki Mori, Tatsuya Ando, Takahiro Matsumoto, Takeshi Yatabe, Mitsuhiro Kikkawa, Ki Suk Yoon, Seiji Ogo, Multifunctional Catalysts for H2O2-Resistant Hydrogen Fuel Cells, Angewandte Chemie - International Edition, 10.1002/anie.201810270, 57, 48, 15792-15796, 2018.11, The development of hydrogen fuel cells is greatly hindered by the unwanted generation of H2O2 at the cathode. A non-Pt cathode catalyst is now shown to be capable of simultaneously reducing both O2 and H2O2, thus rendering H2O2 a useful part of the feed stream. The applicability of this unique catalyst is demonstrated by employing it in a fuel cell running on H2/CO and O2/H2O2.. |
| 8. |
Takeshi Yatabe, Taisuke Tokunaga, Takahiro Matsumoto, Mitsuhiro Kikkawa, Ki-Seok Yoon, Seiji Ogo, A Mn-I Model for the Photoinhibited Species of Oxygen-evolving Complex, CHEMISTRY LETTERS, 10.1246/cl.170869, 47, 1, 34-36, 2018.01, We report the reactivity of a new Mn-I(cyclam) complex (cyclam: 1,4,8,11-tetraazacyclotetradecane) toward O-2 and H2O as a model for the photoinhibited species of oxygen-evolving complex (OEC). The reactivity varies according to the number of CO ligands. A Mn-I dicarbonyl complex, [Mn-I(cyclam)(CO)(2)](+) reacts with O-2, but not with H2O, to form a bis(mu-oxo) Mn-2(III,IV) complex, though a Mn-I tricarbonyl complex, [Mn-I(cyclam)(CO)(3)](+) does not react with either O-2 or H2O. Newly synthesized Mn-I(cyclam) dicarbonyl complex was characterized by ESI mass spectrometry, UV-vis absorption spectroscopy, IR spectroscopy, and X-ray analysis.. |
| 9. |
Taisuke Tokunaga, Takeshi Yatabe, Takahiro Matsumoto, Tatsuya Ando, Ki-Seok Yoon, Seiji Ogo, Mechanistic investigation of the formation of H2 from HCOOH with a dinuclear Ru model complex for formate hydrogen lyase, Science and Technology of Advanced Materials, 10.1080/14686996.2017.1379857, 18, 1, 870-876, 2017.12, We report the mechanistic investigation of catalytic H2 evolution from formic acid in water using a formate-bridged dinuclear Ru complex as a formate hydrogen lyase model. The mechanistic study is based on isotope-labeling experiments involving hydrogen isotope exchange reaction.. |
| 10. |
Mitsuhiro Kikkawa, Takeshi Yatabe, Takahiro Matsumoto, Ki-Seok Yoon, Kazuharu Suzuki, Takao Enomoto, Kenji Kaneko, Seiji Ogo, A Fusion of Biomimetic Fuel and Solar Cells Based on Hydrogenase, Photosystem II, and Cytochrome c Oxidase, CHEMCATCHEM, 10.1002/cctc.201700995, 9, 21, 4024-4028, 2017.11, We report an Ir complex as an anode catalyst capable of switching between a hydrogenase-type fuel-cell mode and a photosystem II-type solar-cell mode. This catalyst is connected to carbon-black-supported platinum as a cathode catalyst, which reduces dioxygen in a manner analogous to cytochrome c oxidase. Together, they make a system capable of switching between the two modes.. |
| 11. |
Takahiro Matsumoto, Takahiro Kishima, Takeshi Yatabe, Ki-Seok Yoon, Seiji Ogo, Mechanistic Insight into Switching between H-2- or O-2-Activation by Simple Ligand Effects of [NiFe]hydrogenase Models, ORGANOMETALLICS, 10.1021/acs.organomet.7b00471, 36, 20, 3883-3890, 2017.10, We present a mechanistic investigation for the activation of H-2 and O-2, induced by a simple ligand effect within [NiFe] models for O-2-tolerant [NiFe]hydrogenase. Kinetic study reveals Michaelis-Menten type saturation behaviors for both H-2 and O-2 activation, which is the same behavior as that found in O-2-tolerant [NiFe]hydrogenase. Such saturation behavior is caused by H-2 complexation followed by heterolytic cleavage of H-2 by an outer-sphere base, resulting in the formation of a hydride species showing hydridic character.. |
| 12. |
Seiji Ogo, Yuki Mori, Tatsuya Ando, Takahiro Matsumoto, Takeshi Yatabe, Ki-Seok Yoon, Hideki Hayashi, Masashi Asano, One Model, Two Enzymes: Activation of Hydrogen and Carbon Monoxide, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 10.1002/anie.201704864, 56, 33, 9723-9726, 2017.08, The ability to catalyze the oxidation of both H-2 and CO in one reaction pot would be a major boon to hydrogen technology since CO is a consistent contaminant of H-2 supplies. Here, we report just such a catalyst, with the ability to catalyze the oxidation of either or both H-2 and CO, based on the pH value. This catalyst is based on a NiIr core that mimics the chemical function of [NiFe] hydrogenase in acidic media (pH 4-7) and carbon monoxide dehydrogenase in basic media (pH 7-10). We have applied this catalyst in a demonstration fuel cell using H-2, CO, and H (2)/CO (1/1) feeds as fuels for oxidation at the anode. The power density of the fuel cell depends on the pH value in the media of the fuel cell and shows a similar pH dependence in a flask. We have isolated and characterized all intermediates in our proposed catalytic cycles.. |
| 13. |
Yatabe T, Kishima T, Nagano H, Matsumoto T, Yamasaki M, Yoon K.-S, Ogo S, Structure and reactivity of a Ru-based peroxide complex as a reactive intermediate of O2-promoted activation of a C-H bond in a Cp∗ ligand, Chemistry Letters, 10.1246/cl.160909, 46, 1, 74-76, 2017.01. |
| 14. |
Koji Yoshimoto, Takeshi Yatabe, Takahiro Matsumoto, Viet-Ha Tran, Andrew Robertson, Hidetaka Nakai, Koichiro Asazawa, Hirohisa Tanaka, Seiji Ogo, Inorganic Clusters with a [Fe2MoOS3] Core—A Functional Model for Acetylene Reduction by Nitrogenases. , Dalton Transactions, 10.1039/C6DT01655C , 2016.10. |
| 15. |
Keisuke Takashita, Takahiro Matsumoto, Takeshi Yatabe, Hidetaka Nakai, Seiji Ogo, A Non-precious Metal, Ni Molecular Catalyst for a Fuel Cell Cathode, CHEMISTRY LETTERS, 10.1246/cl.150988, 45, 2, 137-139, 2016.02, We report the first example of a non-precious metal molecular catalyst for a fuel cell cathode. A nickel dihydrido complex is capable of reducing dioxygen to water through a four-electron pathway, as evidenced by an isotope-labeling experiment and electrochemical measurements.. |
| 16. |
Yoshimoto K, Yatabe T, Matsumoto T, Robertson A, Nakai H, Tanaka H, Kamachi T, Shiota Y, Yoshizawa K, Asazawa K, Tanaka H, Ogo S, Synthesis and structure of a water-soluble μ-η1:η1-N2 dinuclear RuII complex with a polyamine ligand, Chemistry Letters, 10.1246/cl.151004, 45, 2, 149-151, 2016.02. |
| 17. |
Keisuke Takashita, Takahiro Matsumoto, Takeshi Yatabe, Hidetaka Nakai, Masatatsu Suzuki, Seiji Ogo, A Water-soluble Ni Dihydrido Complex That Reduces O-2 to H2O in Water, CHEMISTRY LETTERS, 10.1246/cl.150935, 45, 1, 72-74, 2016.01, We report the first example of reduction of O-2 to H2O by a Ni(II) dihydrido species. Isotope-labeling experiments reveal a four-electron reduction of O-2 by the dihydrido species. The water-soluble Ni(II) dihydrido species was characterized by X-ray analysis, electrospray ionization mass spectrometry, and IR, H-1-INMR, ESR, and UV-vis spectroscopies.. |
| 18. |
Takeshi Yatabe, Mitsuhiro Kikkawa, Takahiro Matsumoto, Keishi Urabe, Andrew Robertson, Hidetaka Nakai, Seiji Ogo, An Fe-based Model for Metabolism Linking between O-2-reduction and H2O-oxidation, CHEMISTRY LETTERS, 10.1246/cl.150468, 44, 9, 1263-1265, 2015.09, Here, we report the first Fe-based model for metabolism linking between the dioxygen reduction of respiration and the water oxidation of photosynthesis. The reaction mechanism was investigated by X-ray analysis, UV-vis spectroscopy, and mass spectrometry.. |
| 19. |
Viet-Ha Tran, Takeshi Yatabe, Takahiro Matsumoto, Hidetaka Nakai, Kazuharu Suzuki, Takao Enomoto, Seiji Ogo, An IrSi Oxide Film as a Highly Active Water-Oxidation Catalyst in Acidic Media., Chemical Communications, 10.1039/c5cc04286k, 51, 12589-12592, 2015.07. |
| 20. |
Viet-Ha Tran, Takeshi Yatabe, Takahiro Matsumoto, Hidetaka Nakai, Kazuharu Suzuki, Takao Enomoto, Seiji Ogo, An N-2-compatible Ni-0 Metal-Organic Chemical Vapor Deposition (MOCVD) Precursor, CHEMISTRY LETTERS, 10.1246/cl.150155, 44, 6, 794-796, 2015.06, We report the first example of a Ni-0 precursor that provides a contamination-free (<1%) nickel film by metal-organic chemical vapor deposition (MOCVD) using N-2 as the carrier gas. The structure and physical properties of the Ni-0 precursor and subsequent film are described.. |
| 21. |
Takahiro Matsumoto, Tatsuya Ando, Yuki Mori, Takeshi Yatabe, Hidetaka Nakai, Seiji Ogo, A (Ni-SIr)(I) model for [NiFe]hydrogenase, JOURNAL OF ORGANOMETALLIC CHEMISTRY, 10.1016/j.jorganchem.2014.09.025, 796, 73-76, 2015.11, We report the synthesis and characterization of a m-hydroxo NiRu complex as a model for the active site of (Ni-SIr)(I) of [NiFe]hydrogenase. This is the first example of the (Ni-SIr)(I) model with a bridging hydroxo ligand between dimetal centers and an available coordination site on Ni center cis to the bridging hydroxo ligand. We have determined the structure of the (NieSIr)(I) model complex by X-ray analysis and reported reversible switching between the catalytically inactive (NieSIr)(I) and a catalytically active (NieSIr)(II) models. (C) 2014 Elsevier B.V. All rights reserved.. |
| 22. |
Harutaka Nakamori, Takahiro Matsumoto, Takeshi Yatabe, YOON KI SUK, Hidetaka Nakai, Seiji Ogo, Synthesis and Crystal Structure of a Dinuclear, Monomeric MnII p-Semiquinonato Complex, Chemical Communications, 50, 13059-13061, 2014.09. |
| 23. |
A [NiFe]hydrogenase model that catalyses the release of hydrogen from formic acid.. |
| 24. |
Takeshi Yatabe, Takahiro Kikunaga, Takahiro Matsumoto, Hidetaka Nakai, Ki-Seok Yoon, Seiji Ogo, Synthesis of Aqueous-stable and Water-soluble Mononuclear Nonheme Mn-V-Oxo Complexes Using H2O2 as an Oxidant, CHEMISTRY LETTERS, 10.1246/cl.140376, 43, 8, 1380-1382, 2014.08, We report the synthesis of mononuclear nonheme manganese(V)-oxo complexes in aqueous acetonitrile solution from the reaction of manganese(M) complexes using hydrogen peroxide as an oxidant for the first time. A crystal structure of chloro derivative of manganese(V)-oxo complex and its reactivity toward 3,5-di-tert-butyl-catechol are also reported.. |
| 25. |
Nga T. Nguyen, Takeshi Yatabe, Ki-Seok Yoon, Seiji Ogo, Molybdenum-containing membrane-bound formate dehydrogenase isolated from Citrobacter sp S-77 having high stability against oxygen, pH, and temperature, JOURNAL OF BIOSCIENCE AND BIOENGINEERING, 10.1016/j.jbiosc.2014.03.011, 118, 4, 386-391, 2014.10, Membrane-bound formate dehydrogenase (FDH) was purified to homogeneity from a facultative anaerobic bacterium Citrobacter sp. S-77. The FDH from Citrobacter sp. S-77 (FDHS77) was a monomer with molecular mass of approximately 150 kDa. On SDS-PAGE, the purified FDHS77 showed as three different protein bands with molecular mass of approximately 95, 87, and 32 kDa, respectively. Based on the N-terminal amino acid sequence analysis, the sequence alignments observed for the 87 kDa protein band were identical to that of the large subunit of 95 kDa, indicating that the purified FDHS77 consisted of two subunits; a 95 kDa large subunit and a 32 kDa small subunit. The purified FDHS77 in this purification did not contain a heme b subunit, but the FDHS77 showed significant activity for formate oxidation, determined by the V-max of 30.4 U/mg using benzyl viologen as an electron acceptor. The EPR and ICP-MS spectra indicate that the FDHS77 is a molybdenum-containing enzyme, displaying a remarkable O-2-stability along with thermostability and pH resistance. This is the first report of the purification and characterization of a FDH from Citrobacter species. (c) 2014, The Society for Biotechnology, Japan. All rights reserved.. |
| 26. |
Harutaka Nakamori, Takeshi Yatabe, Ki-Seok Yoon, Seiji Ogo, Purification and characterization of an oxygen-evolving photosystem II from Leptolyngbya sp strain 0-77, JOURNAL OF BIOSCIENCE AND BIOENGINEERING, 10.1016/j.jbiosc.2014.01.009, 118, 2, 119-124, 2014.08, A new cyanobacterium of strain 0-77 was isolated from a hot spring at Aso-Kuju National Park, Kumamoto, Japan. According to the phylogenetic analysis determined by 165 rRNA gene sequence, the strain 0-77 belongs to the genus Leptolyngbya, classifying into filamentous non-heterocystous cyanobacteria. The strain 0-77 showed the thermophilic behavior with optimal growth temperature of 55 degrees C. Moreover, we have purified and characterized the oxygen-evolving photosystem II (PSII) from the strain 0-77. The O-2-evolving activity of the purified PSII from strain 0-77 (PSII077) was 1275 +/- 255 mu mol O-2 (mg ChI a)(-1) h(-1). Based on the results of MALDI-TOF mass spectrometry and urea-SDS-PAGE analysis, the purified PSII077 was composite of the typical PSII components of CP47, CP43, PsbO, D2, D1, PsbV, PsbQ, PsbU, and several low molecular mass subunits. Visible absorption and 77 K fluorescence spectra of the purified PSII077 were almost identical to those of other purified PSIIs from cyanobacteria. This report provides the successful example for the purification and characterization of an active PSII from thermophilic, filamentous non-heterocystous cyanobacteria. (C) 2014, The Society for Biotechnology, Japan. All rights reserved.. |
| 27. |
Takeshi Yatabe, Mitsuhiro Kikkawa, Takahiro Matsumoto, Hidetaka Nakai, Kenji Kaneko, Seiji Ogo, A Model for the Water-Oxidation and Recovery Systems of the Oxygen-Evolving Complex, Dalton Transactions, 43, 3063-3071, 2013.12. |
| 28. |
Takeshi Yatabe, Masaki Karasawa, Kiyoshi Isobe, Seiji Ogo, Hidetaka Nakai, A Naphthyl-Substituted Pentamethylcyclopentadienyl Ligand and its Sm(II) Bent-Metallocene Complexes with Solvent-Induced Structure Change., Dalton Transactions, 41, 354-356, 2011.11. |
| 29. |
Takeshi Yatabe, Hidetaka Nakai, Koichi Nozaki, Tomoo Yamamura, Kiyoshi Isobe, Photofunctionalization of a Pentamethylcyclopentadienyl Ligand with the N-Phenylcarbazolyl Group To Prepare a Highly Luminescent Tb3+ Complex Having a Fast Radiation Rate, ORGANOMETALLICS, 10.1021/om1003094, 29, 11, 2390-2393, 2010.06, Lanthanide(III)bent-metallocene complexes with a novel photofunctionalized pentamethylcyclopentadienyl ligand having an N-phenylcarbazolyl group (Cp-PhCar = eta(5)-C5Me4CH2-C18H12N), [Ln(Cp-PhCar)(2)I(THF)] (Ln = Tb (1), Gd (2)), were prepared and their molecular structures and luminescence properties were investigated. The f-f emission from the terbium metal center of I was efficiently sensitized by Cp-PhCar (epsilon = 0.88 x 10(4) M-1 cm(-1) at 331 nm, Phi = 0.67 at 330 nm excitation, k(r) = 1.68 x 10(3) s(-1)). Additionally, the solid-state structure of potassium salts of C-5-ring (eta(5)-C5R5, R = Me, H) derivatives was uncommonly characterized in Cp-PhCar.. |
