* Pyrazolato and 3,5-Dimethylpyrazolato Bridged Dinuclear Platinum(II), Palladium(II), and Their Mixed-metal Complexes of 2,2'-Bipyrimidine. Syntheses, Structures, and Luminescent Properties
K. Umakoshi, K. Kimura, Y. H. Kim, Y. Tsukimoto, Y. Arikawa, M. Onishi, S. Ishizaka, N. Kitamura
Bulletin of the Chemical Society of Japan, 83, pp. 1504-1510 (2010). DOI:10.1246/bcsj.20100208
K. Saito, Y. Nakao, K. Umakoshi, S. Sakaki
Inorganic Chemistry, 49, pp. 8977-8985 (2010). DOI:10.1021/ic201257b
Y. Arikawa, S. Tashita, S. Yamaguchi, H. Miyahara, T. Asayama, K. Umakoshi, M. Onishi
Chemistry Letters, 39, pp. 940-941 (2010) DOI:10.1246/cl.2010.940
* Protonation of a Ruthenium Vinylidene Complex with a NO Ligand Leading to Ruthenium Vinyl Complexes
Y. Arikawa, H. Yamasaki, M. Yamaguchi, K. Umakoshi, M. Onishi
Organometallics, 28, pp. 5587-5589 (2009). DOI:10.1021/om900576h
* Luminescent Heteropolynuclear Complexes of 3,5-Dimethylpyrazolate [Pt2Au2M2(Me2pz)8] (M = Ag, Cu) Showing the Synergistic Effect of Three Transition Elements in the Excited State
K. Umakoshi, K. Saito, Y. Arikawa, M. Onishi, S. Ishizaka, N. Kitamura, Y. Nakao, S. Sakaki
Chemistry - A European Journal, 15, pp. 4238-4242 (2009). DOI:10.1002/chem.200900290
* Vinylidene Rutheniums with an Electrostructurally-Flexible NO Ligand and their Ruthenacyclobutene Formation
M. Yamaguchi, Y. Arikawa, Y. Nishimura, K. Umakoshi, M. Onishi
Chemical Communications, pp. 2911-2913 (2009). DOI:10.1039/B821561H
* N-C Bond Formation of NO Ligands on Ruthenium Complexes with Concurrent Vinylic C-H Activation and Subsequent Proton-Induced Reactivities of the Resulting Nitrosovinyl Species
Y. Arikawa, T. Asayama, K. Itatani, M. Onishi
Journal of The American Chemical Society, 130, pp. 10508-10509 (2008). DOI:10.1021/ja804095u
* Heteropolynuclear Complexes of 3,5-Dimethylpyrazolate [Pt2M4(Me2pz)8] (M = Ag, Cu). Highly Luminescent Character of the Triplet Excited State based on Mixed-metal Cores
K. Umakoshi, T. Kojima, K. Saito, S. Akatsu, M. Onishi, S. Ishizaka, N. Kitamura, Y. Nakao, S. Sakaki, Y. Ozawa
Inorganic Chemistry, 47, pp. 5033-5035 (2008). DOI:10.1021/ic702310t
* Triphenylphosphine Incorporation Reactions of Diynyl Complexes Containing TpRu(NO) Fragment and Isomerization to Ruthenacyclobuta[b]naphthalene
Y. Arikawa, T. Asayama, C. Tanaka, S. Tashita, M. Tsuji, K. Ikeda, K. Umakoshi, M. Onishi
Organometallics, 27, pp. 1227-1233 (2008). DOI:10.1021/om701028r
* Reversible N-N Coupling of NO ligands on Dinuclear Ruthenium Complexes and Subsequent N2O Evolution: Relevance to Nitric Oxide Reductase
Y. Arikawa, T. Asayama, Y. Moriguchi, S. Agari, M. Onishi
Journal of The American Chemical Society, 129, pp. 14160-14161 (2007). DOI:10.1021/ja0763504
* Syntheses of Four-Membered Metallacyclic Complexes with Nitrosylruthenium and Their Ring-Opening upon HCl Addition
Y. Arikawa, K. Ikeda, T. Asayama, Y. Nishimura, M. Onishi
Chemistry - A European Journal, 13, pp. 4024-4036 (2007). DOI:10.1002/chem.200601163
* Proton-Assisted Addition Reactions on Trimethylsilylalkynyl Nitrosylrutheniums of Hydrotris(pyrazolyl)borate
Y. Arikawa, T. Asayama, M. Onishi
Journal of Organometallic Chemistry, 692, pp. 194-200 (2007). DOI:10.1016/j.jorganchem.2006.08.040
* Deep Blue Mixed-valent Pt(II,III,III)3 Complex [Pt3Br2(μ-pz)6] (pz = Pyrazolate) Showing Valence-detrapping Behavior in Solution
K. Umakoshi, T. Kojima, Y. H. Kim, M. Onishi, Y. Nakao, S. Sakaki
Chemistry - A European Journal, 12, pp. 6521-6527 (2006). DOI:10.1002/chem.200600649
* Heteropolynuclear Palladium Complexes with Pyrazolate and Its 3-Tertiary Butyl Derivatives. The Observation of Effect of Heterometal Ions on the Rate of Isomerization
K. Umakoshi, T. Kojima, Y. Arikawa, M. Onishi
Chemistry - A European Journal, 12, pp. 5094-5104 (2006). DOI:10.1002/chem.200501035
* Syntheses and Characterization of New (Pyrazolato)(pyrazole) Rutheniums with κ3-polypyrazolylborates: Halogeno-Anion Binding through the Tris(pyrazole) Moiety
M. Onishi, M. Yamaguchi, S. Kumagae, H. Kawano, Y. Arikawa
Inorganica Chimica Acta, 359, pp. 990-997 (2006). DOI:10.1016/j.ica.2005.08.005
* Formation of An Unsymmetrical Dinuclear Ruthenium Complex with μ-H, μ-OH, and μ-κ2-CO2 Bridges and Multiple Reactive Sites
Y. Arikawa, S. Nagae, J. Morishita, K. Hiraki, M. Onishi
Angewandte Chemie, International Edition, 44, pp. 5509-5513 (2005). DOI:10.1002/anie.200501335
* Regioselective Nucleophilic Addition of Triphenylphosphine to the Nitrosylruthenium Alkynyl Complexes having a Hydrotris(pyrazol-1-yl)borate: Formation of Phosphonio-Alkenyl, Alkynyl, and Allenyl Species
Y. Nishimura, Y. Arikawa, T. Inoue, M. Onishi
Dalton Transactions, pp. 930-937 (2005). DOI:10.1039/B415483E
* Unusual Magnetic Properties of the Edge-Sharing Bioctahedral Dirhenium(IV) Complex of Pyridine-2-thiolate
K. Umakoshi, N. Misasa, C. Ohtsu, T. Kojima, M. Sokolov, M. Wakeshima, Y. Hinatsu, M. Onishi
Angewandte Chemie, International Edition, 44, pp. 720-724 (2005). DOI:10.1002/anie.200460532
*Chiral Distortion of Di(μ-sulfido)bis[oxomolybdenum(V)] Complexes of a Hexadentate Ligand N,N,N',N'-Tetrakis(2-pyridylmethyl)-R-propylenediamine and Its Analogs
H.-Y. Jin, R. Hazama, M. Yamasaki, K. Umakoshi, K. Tsuge, Y. Sasaki
Bulletin of the Chemical Society of Japan, 78, pp. 2161-2163 (2005). DOI:10.1246/bcsj.78.2161
* Syntheses, Properties, and Structural Characteristics of Several New [Tetrakis(1-pyrazolyl)borato]samarium(III) Complexes: Comparative Study of the B(Pyrazolyl)4 and BH(Pyrazolyl)3 Ligation
M. Onishi, K. Kayano, K. Inada, H. Yamaguchi, J. Nagaoka, Y. Arikawa, T. Takatani
Inorganica Chimica Acta, 357, pp. 4091-4101 (2004). DOI:10.1016/j.ica.2004.06.017
* Hydration of Nitrosylruthenium Bis(alkynyl) Complexes with Hydrotris(pyrazolyl)borate: Insertion / Hydration and Double Hydration Products
Y. Arikawa, Y. Nishimura, K. Ikeda, M. Onishi
Journal of The American Chemical Society, 126, pp. 3706-3707 (2004). DOI:10.1021/ja039365k
A Pair of Seven Coordinate Oxorhenium Complexes, [ReIVO(tpen)]2+ and [ReVO(tpen)]3+ (tpen = N,N,N',N'-Tetrakis(2-pyridylmethyl)ethylenediamine)
H.-Y. Jin, S. Ikari, K. Kobayashi, K. Umakoshi, H. Sugimoto, A. Mitani, M. Abe, Y. Sasaki, T. Ito
Bulletin of the Chemical Society of Japan, 77, pp. 1139-1146 (2004). DOI:10.1246/bcsj.77.1139
* Hydration of Nitrosylruthenium Acetylide Complexes Having a Tris(pyrazol-1-yl)borate in the Presence of Protic Acid
Y. Arikawa, Y. Nishimura, H. Kawano, M. Onishi
Organometallics, 22, pp. 3354-3356 (2003). DOI:10.1021/om0303597
* Structural Studies on the Stepwise Chelating Processes of Bidentate 2-(Aminomethyl)pyridine and Tridentate Bis(2-pyridylmethyl)amine towards an Acetate-Bridged Dirhodium(II) Center
T. Yoshimura, K. Umakoshi, Y. Sasaki
Inorganic Chemistry, 42, pp. 7106-7115 (2003). DOI:10.1021/ic030093w
* Pyrazolato-Bridged Polynuclear Palladium and Platinum Complexes. Synthesis, Structure, and Reactivity
K. Umakoshi, Y. Yamauchi, K. Nakamiya, T. Kojima, M. Yamasaki, H. Kawano, M. Onishi
Inorganic Chemistry, 42, pp. 3907-3916 (2003). DOI:10.1021/ic026196g
* Synthesis, Structure and Reactions of Coordinatively Unsaturated [RuCl(CO)(dppf)(PPh3)]BF4 where dppf is trans-spanning 1,1’-Bis(diphenylphosphino)ferrocene
H. Kawano, Y. Nishimura, M. Onishi
Dalton Transactions, pp. 1808-1812 (2003). DOI:10.1039/B212096H
* Syntheses and Structures of Mono- and Dinuclear Platinum Complexes of Pyrimidine-2-thiolate and Its 4-Methyl and 4,6-Dimethyl Derivatives
O. Asada, K. Umakoshi, K. Tsuge, S. Yabuuchi, Y. Sasaki, M. Onishi
Bulletin of the Chemical Society of Japan, 76, pp. 549-555 (2003). DOI:10.1246/bcsj.76.549
* Stereochemically Non-rigid Motions and Structural Characteristics of (η3-2-Methallyl){tetrakis(3-t-butylpyrazolyl)borato}palladium(II)
M. Onishi, M. Yamaguchi, E. Nishimoto, Y. Itoh, J. Nagaoka, K. Umakoshi, H. Kawano
Inorganica Chimica Acta, 343, pp. 111-118 (2003). DOI:10.1016/S0020-1693(02)01193-3
* Carbon-Sulfur and Carbon-Phosphorus Bond Cleavage and Subsequent Carbon-Carbon Bond Formation Promoted by an Active Ruthenium(0) Species
H. Kawano, H. Narimatsu, D. Yamamoto, K. Tanaka, K. Hiraki, M. Onishi
Organometallics, 21, pp. 5526-5530 (2002). DOI:10.1021/om020127s
* N,N,N',N'-Tetrakis(2-pyridylmethyl)ethylenediamine and its Analogues as Hypodentate Ligands. Synthesis and Characterization of the Rhodium(III), Ruthenium(II), and Palladium(II) Complexes
M. Sokolov, K. Umakoshi, Y. Sasaki
Inorganic Chemistry, 41, pp. 6237-6243 (2002). DOI:10.1021/ic0203264
* C-S Bond Cleavage of Pyridine-2-thiol: A New Functionality of Quadruply Bridged Dinuclear Platinum and Palladium Complexes
K. Umakoshi, T. Yamasaki, A. Fukuoka, H. Kawano, M. Ichikawa, M. Onishi
Inorganic Chemistry, 41, pp. 4093-4095 (2002). DOI:10.1021/ic020282z
* Preparation, spectroscopic properties, and dynamic behavior of a -oxo dirhenium(III) complex [Re2( -O)Cl2(tpa)2](PF6)2 (tpa = tris(2-pyridylmethyl)amine)
H. Sugimoto, T. Takahira, T. Yoshimura, M. Shiro, M. Yamasaki, H. Miyake, K. Umakoshi, Y. Sasaki
Inorganica Chimica Acta, 337, pp. 203-211 (2002). DOI:10.1016/S0020-1693(02)01035-6
* Electrochemical Influence of Tridentate Polypyrazolylborate Ligands: Syntheses and Electrochemistry of Bis(η3-polypyrazolylborato)ruthenium(II) Complexes
M. Onishi, S. Kumagae, K. Asai, H. Kawano, Y. Shigemitsu
Chemistry Letters, 30, pp. 96-97 (2001). DOI:10.1246/cl.2001.96
* Comparative Structural, Spectroscopic and Redox Studies of Isostructural Complexes of Ruthenium(III), Osmium(III), and Rhenium(III): cis-Dichloro Complexes Containing Tris(2-pyridylmethyl)amine and Its 6-Methylpyridyl Derivative
H. Sugimoto, C. Matsunami, C. Koshi, M. Yamasaki, K. Umakoshi, Y. Sasaki
Bulletin of the Chemical Society of Japan, 74, pp. 2091-2099 (2001). DOI:10.1246/bcsj.74.2091
* Synthesis and crystal structure of [Ru2(μ-pyS)3(pyS)2](CF3SO3): the first Ru(III) complex of 2-mercaptopyridine
M. Sokolov, Y. Sasaki, K. Umakoshi
Inorganic Chemical Communication, 4, pp. 142-144 (2001). DOI:10.1016/S1387-7003(01)00143-5
* Synthesis, Structure, and Properties of Sulfido-Bridged Dinuclear Tungsten(V) Complex of Dithiolene, (Pr4N)2[W2(μ-S)2{S2C2(CO2Et)2}4]
K. Umakoshi, E. Nishimoto, M. Sokolov, H. Kawano, Y. Sasaki, M. Onishi
Journal of Organometallic Chemistry, 611, pp. 370-375 (2000). DOI:10.1016/S0022-328X(00)00409-5
* Synthesis and Molecular Structure of [RuCl{C(=CHPh)OC(=O)CH2CH3}(CO)(PPh3)2]: A Real Intermediate in Ruthenium Complex-Catalyzed Selective Synthesis of a (Z)-enol Ester
H. Kawano, Y. Masaki, T. Matsunaga, K. Hiraki, M. Onishi, T. Tsubomura
Journal of Organometallic Chemistry, 601, pp. 69-77 (2000). DOI:10.1016/S0022-328X(00)00027-9
* Emission and Metal- and Ligand Centered Redox Characteristics of Hexarhenium(III) Clusters, trans- and cis-[Re6(η3-S)8Cl4(L)2]2-, where L is Pyridine Derivatives or Pyrazine
T. Yoshimura, K. Umakoshi, Y. Sasaki, S. Ishizaka, H.-B. Kim, N. Kitamura
Inorganic Chemistry, 39, pp. 1765-1772 (2000). DOI:10.1021/ic991282a
* The Solid and Solution State Structures of a Reversible Molecular Oxygen-Carrying Molybdenum Porphyrin Dioxygen Complex
T. Fujihara, N. H. Rees, K. Umakoshi, J. Tachibana, Y. Sasaki, W. McFarlane, T. Imamura
Chemistry Letters, 29, pp. 102-103 (2000). DOI:10.1246/cl.2000.102
* Self-Assembled Monolayers of Non-Heme Diiron(III) Model Complexes on Au(111) Electrode: Synthesis and Proton-Coupled Redox Behavior in Water
T. Inomata, M. Abe, T. Kondo, K. Umakoshi, K. Uosaki, Y. Sasaki
Chemistry Letters, 28, pp. 1097-1098 (1999). DOI:10.1246/cl.1999.1097
* Hexarhenium(III) Clusters [Re6(μ3-S)8X6]4- (X = Cl-, Br-, I-) are Luminescent at Room Temperature
T. Yoshimura, S. Ishizaka, K. Umakoshi, Y. Sasaki, H.-B. Kim, N. Kitamura
Chemistry Letters, 28, pp. 697-698 (1999). DOI:10.1246/cl.1999.697
* Syntheses of New {Tetrakis(1-pyrazolyl)borato}samarium(III) Complexes and Their Temperature-Dependent Exchange Motions of All Pyrazolyl Groups
M. Onishi, H. Yamaguchi, H. Shimotsuma, K. Hiraki, J. Nagaoka, H. Kawano
Chemistry Letters, 28, pp. 573-574 (1999). DOI:10.1246/cl.1999.573
* Novel Dihydridoruthenium(II) Complexes with Chelating Diphosphine Ligands, RuH2(CO)(diphosphine)(PPh3) (diphosphine = dppe, dppp, dppb, and dppf)
H. Kawano, R. Tanaka, T. Fujikawa, K. Hiraki, M. Onishi
Chemistry Letters, 28, pp. 401-402 (1999). DOI:10.1246/cl.1999.401
* Synthesis, Structures and Redox Properties of Octa(μ3-sulfido)hexarhenium(III) Complexes Having Terminal Pyridine Ligands
T. Yoshimura, K. Umakoshi, Y. Sasaki, A. G. Sykes
Inorganic Chemistry, 38, pp. 5557-5564 (1999). DOI:10.1021/ic9907922
* Enhanced Kinetic Lability of Ru(III) Centers in Oxo-Centered Mixed-Metal Ru2M Trinuclear Complexes (M = Zn and Mg)
M. Abe, M. Tanaka, K. Umakoshi, Y. Sasaki
Inorganic Chemistry, 38, pp. 4146-4148 (1999). DOI:10.1021/ic990047p
* Synthesis, Structure, and Characterization of a Sulfate-Bridged Oxomolybdenum(V) Porphyrin Dimer and Related Monomers Including a Nitrate Complex
Y. Okubo, A. Okamura, K. Imanishi, J. Tachibana, K. Umakoshi, Y. Sasaki, T. Imamura
Bulletin of the Chemical Society of Japan, 72, pp. 2241-2247 (1999). DOI:10.1246/bcsj.72.2241
* Interaction of Some Lewis Acids with the Oxide-Bridge of (μ-Oxo)di(μ-acetato)- diruthenium(III,III) Complexes and Its Electrochemical Consequence
T. Inomata, K. Umakoshi, Y. Sasaki
Electrochemistry, 67, pp. 427-430 (1999). DOI:
* Synthesis and Redox Properties of Amino Acid-Bridged Dinuclear Iron(III) Complexes
K. Umakoshi, Y. Tsuruma, C.-E Oh, A. Takasawa, H. Yasukawa, Y. Sasaki
Bulletin of the Chemical Society of Japan, 72, pp. 433-440 (1999). DOI:10.1246/bcsj.72.433
* Structural and Kinetic Study on the Ligand Rearrangement Reaction of 2-Aminomethylpyridine on a Di(μ-acetato)dirhodium(II) Center
T. Yoshimura, K. Umakoshi, Y. Sasaki
Chemistry Letters, 28, pp. 267-268 (1999). DOI:10.1246/cl.1999.267