Publications until 2010

* 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

* Theoretical Study of Excited States of Pyrazolate- and Pyridinethiolate-Bridged Dinuclear Platinum(II) Complexes: Relationship between Geometries of Excited States and Phosphorescence Spectra
K. Saito, Y. Nakao, K. Umakoshi, S. Sakaki
Inorganic Chemistry, 49, pp. 8977-8985 (2010). DOI:10.1021/ic201257b

* NO Insertion Reaction of Ethyl(nitrosyl)ruthenium Complex Having Hydrotris(pyrazolyl)borate and Conversion to Acetaldoxime and Acetonitrile Complexes
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 [Re63-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

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