Detailed Information

Research Field/Keywords for Research Field

• coordination chemistry

Education

• 1986/03, Graduated
• 1991/03, Doctor Course, Completed

Employment Experience

• 1990/04 - 1991/03 Postdoctoral Fellowships of Japan Society for the Promotion of Science
• 1991/04 - 1992/03 Research associate of the Japan Society for the Promotion of Science
• 1992/04 - 1996/12 Research Associate, Department of Chemistry, Faculty of Science and Engineering, Saga University
• 1995/05 - 1996/04 Research associate of the Japan Society for the Promotion of Science Odense University
• 1997/01 - 2002/11 Lecturer, Department of Chemistry, Faculty of Science and Engineering, Saga University
• 2002/12 - 2007/03 Associate Professor, Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University
• 2007/04 - 2009/09 Associate Professor, Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University
• 2009/10 - 2010/03 Professor, Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University
• 2010/04 -  *  Professor, Chemistry and Applied Chemistry, Graduate School of Science and Engineering, Saga University
• 2018/04 -  *  Professor, Department of Chemistry and Applied Chemistry, Faculty of Science and Engineering, Saga University

Field of Specialization

• Inorganic chemistry, Functional solid state chemistry, Bio-related chemistry, Nanostructural chemistry

Membership in Academic Societies

• American Chemical Society

Themes for Ongoing Research

• Development of artificial photosynthesis systems with metalloenzyme model complexes
• Development of Single Molecule Magnets

Research Themes in the Past

• Development of artificial photosynthesis systems with metalloenzyme model complexes

Research Topics and Results

• Novel Tetranuclear Heterometallic Mn3Ni and Mononuclear Ni Complexes with an ONO Schiff Base Ligand: Synthesis, Crystal Structures, and Magnetic Properties 2023/11
• Crystal Structure of Binuclear Terephthalato-bridged Manganese(III) Complex with 2-(2′-Hydroxyphenyl)oxazoline Analog 2022/03
• Synthesis and Crystal Structure of a Dinuclear Cu(II) Complex with N,N,N’,N’-tetrakis(2-pyridylmethyl)-1,4-xylenediamine 2022/02
• Synthesis and Crystal Structure of a Mononuclear Cobalt(III) Complex with 2-[(2-Hydroxymethylphenyl)iminomethyl]phenol and Dimethylaminopyridine 2022/01
• Crystal Structure of Dichloro{2-(quinolin-2-yl)-4H-benzo[d][1,3]oxazine}cobalt(II) 2022/01
• Synthesis and Crystal Structure of Bis{2-[(2-hydroxymethylphenyl)iminomethyl]-4-nitro-phenolato}nickel(II) Monoacetonitrile 2021/12
• アゾ基を有する新規ONO三座配位子による多核金属錯体の合成と性質 2021/09
• Crystal structure, magnetic properties, and structural prediction for an oxidovanadium(IV) complex [VO(dmf)5][PF6]2 2021/03
• Magneto-Structural Relationship of Tetragonally-Compressed Octahedral Iron(II) Complex Surrounded by a pseudo-S6 Symmetric Hexakis-Dimethylsulfoxide Environment 2021/02
• Detailed magnetic analysis and successful deepneural-network-based conformational prediction for [VO(dmso)5][BPh4]2 2020/02
• Tetranuclear Hetro-Metal [MnIII2NiII2] Complexes Involving Defective Double-Cubane Structure: Synthesis, Crystal Structures, and Magnetic Properties 2019/02
• Structure and magnetic properties of an oxidovanadium(IV) complex with five dimethylsulfoxide ligands 2018/07
• Synthesis, structural characterization and magnetic properties of one-dimensional Cu(II)-azido coordination polymers 2017/12
• Magneto-​structural correlation of hexakis-​dmso cobalt(II) complex 2017/11
• Syntheses, structures, and magnetic properties of cubane-based cobalt and nickel complexes with ONO-tridentate ligands 2017/10
• SYNTHESES, STRUCTURES, AND MAGNETIC PROPERTIES OF TETRANUCLEAR COBALT AND NICKEL COMPLEXES WITH ONO-TRIDENTATE LIGANDS 2016/09
• Synthesis and magnetic properties of a dinuclear manganese(II) complex with two manganese(II) ions of C2-​twisted octahedral geometry 2016/04
• Synthesis and Crystal Structure of a Tetranuclear Mn(III)-Ni(II) Heterometal Complex of N-(2-oxymethylphenyl)salicylideneimine 2016/01
• Synthesis and magnetic properties of an annulated dinuclear copper(II) phthalocyanine peripherally having 2,6-dimethylphenoxy substituents 2014/11
• Homo- and hetero-dinuclear nickel(II), copper(II), and oxidovanadium(IV) complexes of a Schiff-base-fused phthalocyanine with 2,6-dimethylphenoxy and t-butyl groups 2014/01
• Structures and Magnetic Properties of Cyclic Trinuclear Manganese Complexes 2013/10
• Copper(II)–azido complexes constructed from polypyridyl amine ligands 2013/04
• Molecular-Capsule Assemblies of Trinuclear Macrocyclic Metal Complexes 2012/09
• Synthesis and Crystal Structure of Bis{2-[(2-Hydroxymethylphenyl)iminomethyl] phenolato}chromium(III) nitrate monohydrate 2012/03
• Syntheses and Characterization of Trinuclear Macrocyclic Complexes and Self-Assembling of Molecular Capsule 2011/10
• Synthesis and Crystal Structure of a Dinuclear Manganese(III) Complex of 1-[(2-Hydroxymethylphenyl)iminomethyl]-2-naphthol 2010/11
• Syntheses and Characterization of Trinuclear Macrocyclic Complexes with Polydentate Chelating Ligands with Two Separate Coordination Sites 2010/09
• Syntheses and magnetic properties of polynuclear complexes with ONO tridentate ligands 2010/09
• Synthesis and Crystal Structure of a Mononuclear Copper(II) Complex of N,N’-Bis-2,3,4-trihydroxybenzylidene-1,2-phenylendiamine 2008/12
• Syntheses and Characterization of Trinuclear Macrocyclic Complexes with Polydentate Bridging Ligands with Distinct Coordination Sites 2008/04
• Synthesis and Structure of Mononuclear Iron(III) Complex of 6-Hydroxy-2-(5-bromo-2- hydroxyphenyl)-5-(5-bromosalicylideneamino)benzoxazole 2008/01
• オキサゾリン環を含む多座配位子によるMn（III），Fe（III）錯体の合成とカタラーゼ及びSOD様活性 2007/04
• Syntheses, structures, and reactivities of novel binuclear ruthenium(II) complexes with bis(μ-phosphinato) bridges 2007/03
• Bis{2-[2-(hydroxymethyl)phenyliminomethyl]phenolato}cobalt(III) nitrate monohydrate 2007/01
• Tripodal Trimanganese(III) Complexes of New Unsymmetrical Pentadentate Ligands Derived from 2-(Salicylideneamino)phenol: Syntheses, Crystal Structures and Properties 2007
• Syntheses, Structures, and Magnetic Properties of Tetranuclear NiII4 and NiII2MnIII2 Complexes with ONO Tridentate Ligands 2005
• Crystal Structures and magnetic Properties of Tetranuclear Copper(II) Complexes of N-(2-Hydroxymethylphenyl)salicylideneimine with a Defective Double-Cubane core 2004
• Synthesis, Structure, and Characterization of Dicopper (II) Complex with a New Amidate Ligand 2003
• Syntheses, Magnetic Properties, and Reactivity of Dinuclear Oxovanadium (IV) and Copper (II) Complexes with ($\mu$-diphenylphosphinato)-bridges 2003
• Dichlorobis [N-(2-oxymethylphenyl)salycylideneiminato] diiron (III) 2003

Original Articles

• Novel Tetranuclear Heterometallic Mn3Ni and Mononuclear Ni Complexes with an ONO Schiff Base Ligand: Synthesis, Crystal Structures, and Magnetic Properties;　2023/11
  ANNOUNCEMENT INFO.;　Magnetochemistry, 9, 225
  AUTHOR;　Masato Fukuda, Ken Eguchi, Kazuma Matsumoto, Ko Yoneda, Yasunori Yamada, Haruka Yoshino, Yuki Imamura, Naoya Yamamoto, Masaaki Ohba and Masayuki Koikawa
  
• Crystal Structure of Binuclear Terephthalato-bridged Manganese(III) Complex with 2-(2′-Hydroxyphenyl)oxazoline Analog;　2022/03
  ANNOUNCEMENT INFO.;　X-Ray Structure Analysis Online, 38, 45
  AUTHOR;　Tatsuru ESAKI, Masayuki KOIKAWA, and Tadashi TOKII
  
• Synthesis and Crystal Structure of a Dinuclear Cu(II) Complex with N,N,N’,N’-tetrakis(2-pyridylmethyl)-1,4-xylenediamine;　2022/02
  ANNOUNCEMENT INFO.;　X-ray Structure Analysis Online, 38, 19
  AUTHOR;　Junya SUGIYAMA, Ko YONEDA, Yasunori YAMADA, and Masayuki KOIKAWA
  
• Synthesis and Crystal Structure of a Mononuclear Cobalt(III) Complex with 2-[(2-Hydroxymethylphenyl)iminomethyl]phenol and Dimethylaminopyridine;　2022/01
  ANNOUNCEMENT INFO.;　X-ran Structure Analysis Online, 38, 1
  AUTHOR;　Naoko Sato, Ko Yoneda , Yasunori Yamada, and Masayuki Koikawa
  
• Crystal Structure of Dichloro{2-(quinolin-2-yl)-4H-benzo[d][1,3]oxazine}cobalt(II);　2022/01
  ANNOUNCEMENT INFO.;　X-ray Structure Analysis Online, 38, 13
  AUTHOR;　Fumiya Kanegae, Ko Yoneda , and Masayuki Koikawa
  
• Synthesis and Crystal Structure of Bis{2-[(2-hydroxymethylphenyl)iminomethyl]-4-nitro-phenolato}nickel(II) Monoacetonitrile;　2021/12
  ANNOUNCEMENT INFO.;　X-ray Structure Analysis Online, 37, 85
  AUTHOR;　Yuka Mineyama, Ko Yoneda , Yasunori Yamada, and Masayuki Koikawa
  
• Crystal structure, magnetic properties, and structural prediction for an oxidovanadium(IV) complex [VO(dmf)5][PF6]2;　2021/03
  ANNOUNCEMENT INFO.;　, 74, 8, 1222-1232
  AUTHOR;　Shohei Yamamoto, Ryoji Mitsuhashi, Masahiro Mikuriya, Masayuki Koikawa, Hiroshi Sakiyama
  
• Magneto-Structural Relationship of Tetragonally-Compressed Octahedral Iron(II) Complex Surrounded by a pseudo-S6 Symmetric Hexakis-Dimethylsulfoxide Environment;　2021/02
  ANNOUNCEMENT INFO.;　Magnetochemistry, 7, 2, 30
  AUTHOR;　Hiroshi Sakiyama, Takaaki Abiko, Masayuki Koikawa, Mikio Yamasaki
  
• Syntheses, crystal structures, and solid-state spectroscopic properties of dinuclear cyclometallated platinum(II) complexes with mercaptobenzoazoles as bridging ligands;　2021/01
  ANNOUNCEMENT INFO.;　Inorganica Chimica Acta, 515, 120049
  AUTHOR;　YasunoriYamada, Reina Matsumoto, Daishin Kori, Masayuki Koikawa
  
• Detailed magnetic analysis and successful deepneural-network-based conformational prediction for [VO(dmso)5][BPh4]2;　2020/02
  ANNOUNCEMENT INFO.;　RSC Advances, 10, 9678-9685
  AUTHOR;　Hiroshi Sakiyama, Takaaki Abiko, Kosuke Yoshida, Kaoru Shomura, Ryoji Mitsuhashi, Yoshiki Koyama, Masahiro Mikuriya, Masayuki Koikawa and Minoru Mitsumi
  
• Syntheses, Crystal Structures, and Solid-State Photoluminescence Properties of Heterotrinuclear Zn2Ln (Ln: La, Sm, Eu, Tb) Complexes Derived from 1,4-Diaminobutane-Based N2O4 Compartmental Ligand;　2019/09
  ANNOUNCEMENT INFO.;　Polyhedron, 170, 15, 612-621
  AUTHOR;　Daishin Kori, Yuma Dote, Masayuki Koikawa, Yasunori Yamada
  
• Syntheses, Crystal Structures, and Solid-State Spectroscopic Properties of Helical and Non-Helical Dinuclear Zinc(II) Complexes Derived from N2O2 Ligands with Different Torsion-Generating Sources;　2019/06
  ANNOUNCEMENT INFO.;　Inorganica Chimica Acta, 495, 118979
  AUTHOR;　Yuuki Oshikawa, Ko Yoneda, Masayuki Koikawa, Yasunori Yamada
  
• Syntheses, crystal structures, and solid-state photoluminescence properties of heterotrinuclear Zn2Ln (Ln: La, Sm, Eu, Tb) complexes derived from 1,4-diaminobutane-based N2O4 compartmental ligand;　2019/03
  ANNOUNCEMENT INFO.;　Polyhedron, 170, 612-621
  AUTHOR;　Daishin Kori, Yuma Dote, Masayuki Koikawa, Yasunori Yamada
  
• Tetranuclear Hetro-Metal [MnIII2NiII2] Complexes Involving Defective Double-Cubane Structure: Synthesis, Crystal Structures, and Magnetic Properties;　2019/02
  ANNOUNCEMENT INFO.;　Magnetochemistry, 5, 14, 1-11
  AUTHOR;　Yuki Suemitsu, Ryuji Matsunaga, Takashi Toyofuku, Yasunori Yamada, Masahiro Mikuriya, Tadashi Tokii and Masayuki Koikawa
  
• Syntheses, crystal structures, and solid-state spectroscopic properties of helical and non-helical dinuclear zinc(II) complexes derived from N2O2 ligands with different torsion-generating sources;　2019/00
  ANNOUNCEMENT INFO.;　Inorganica Chimica Acta, 495, 11879
  AUTHOR;　Yuuki Oshikawa, Ko Yoneda, Masayuki Koikawa, Yasunori Yamada
  
• Crystal Structure and Magnetic Properties of an Asymmetrical Dinuclear Mn(III) Complex with N-(2-Oxymethylphenyl)salicylideneimine;　2018/07
  ANNOUNCEMENT INFO.;　X-Ray Structure Analysis Online, 34, 29-30
  AUTHOR;　Yuki Suemitsu, Ko Yoneda, Yasunori Yamada, Masayuki Koikawa
  
• Synthesis, structural characterization and magnetic properties of one-dimensional Cu(II)-azido coordination polymers;　2017/12
  ANNOUNCEMENT INFO.;　Polyhedron, 138, 177-184
  AUTHOR;　Febee R. Louka, Salah S. Massoud, Tamim K. Haq, Masayuki Koikawa, Masahiro Mikuriya, Masataka Omote, Roland C. Fischer, Franz A. Mautner
  
• Magneto-​structural correlation of hexakis-​dmso cobalt(II) complex;　2017/11
  ANNOUNCEMENT INFO.;　Dalton Transaction, 46, 46, 16306-16314
  AUTHOR;　Hiroshi Sakiyama, Reiji Sudo, Takaaki Abiko, Daisuke Yoshioka, Ryoji Mitsuhashi, Masataka Omote, Masahiro Mikuriya, Megumi Yoshitake, Masayuki Koikawa
  
• Syntheses, structures, and magnetic properties of cubane-based cobalt and nickel complexes with ONO-tridentate ligands;　2017/10
  ANNOUNCEMENT INFO.;　Polyhedron, 136, 136-142
  AUTHOR;　Megumi Yoshitake, Momoko Nishihashi, Yasumasa Ogata, Ko Yoneda, Yasunori Yamada, Hiroshi Sakiyama, Akio Mishima, Masaaki Ohba, Masayuki Koikawa
  
• Synthesis and crystal structure of a dinuclear Cu(II) complex with N,​N,​N',​N'-​Tetrakis(2-​pyridylmethyl)​-​1,​6-​hexanediamine;　2017/09
  ANNOUNCEMENT INFO.;　X-Ray Structure Analysis Online, 33, 10, 65-66
  AUTHOR;　Yusuke Umemoto, Ko Yoneda, Yasunori Yamada, Masayuki Koikawa
  
• Stereospecific Interaction of Optically Active Sulfur-Bridged Dinuclear Co(III)-Pt(II) Complex with Pseudo-Enantiomeric Co(III)-M(II) (M: Pd or Pt) Complex Involving Unequivalent π Electronic System;　2016/08
  ANNOUNCEMENT INFO.;　Inorganica Chimica Acta, 450, 225-231
  AUTHOR;　Y. Yamada, D. Koori, Y. Oshikawa, and M. Koikawa
  
• Synthesis and magnetic properties of a dinuclear manganese(II) complex with two manganese(II) ions of C2-​twisted octahedral geometry;　2016/04
  ANNOUNCEMENT INFO.;　Polyhedron, 111, 32-37
  AUTHOR;　Sakiyama, Hiroshi; Kato, Masatoshi; Sasaki, Satoshi; Tasaki, Moriya; Asato, Eiji; Koikawa, Masayuki
  
• Synthesis and Crystal Structure of a Tetranuclear Mn(III)-Ni(II) Heterometal Complex of N-(2-oxymethylphenyl)salicylideneimine;　2016/01
  ANNOUNCEMENT INFO.;　X-ray Structure Analysis Online, 32, 1-2
  AUTHOR;　Megumi YOSHITAKE, Ko YONEDA, Yasunori YAMADA, and Masayuki KOIKAWA
  
• Syntheses, crystal structures, and spectroscopic properties of mixed-​ligand cobalt(III) complexes with optically active penicillaminates: Stereospecific interactions and spontaneous crystallizations depending on counter anions;　2015/01
  ANNOUNCEMENT INFO.;　Inorganica Chimica Acta, 428, 127-132
  AUTHOR;　Nagasaki, Toshihiro; Yoneda, Ko; Koikawa, Masayuki; Yamada, Yasunori
  
• Synthesis and magnetic properties of an annulated dinuclear copper(II) phthalocyanine peripherally having 2,6-dimethylphenoxy substituents;　2014/11
  ANNOUNCEMENT INFO.;　Journal of Porphyrins and Phthalocyanines, 18, 708-714
  AUTHOR;　Takahisa Ikeue, Naoko Sawadaa, Naomi Matsumotoa, Ayaka Miyazakia, Tamotsu Sugimori, Masayuki Koikawa, Ichiro Hiromitsu, Katsumi Yoshinoe, Masahiro Mikuriya, Yusuke Kataoka and Makoto Handa
  
• Stereospecific π-​π stacking interactions between pseudo-​enantiomeric sulfur-​bridged dinuclear Co(III)​-​Pd(II) and Co(III)​-​Pt(II) complexes with optically active propanediamines;　2014/09
  ANNOUNCEMENT INFO.;　Journal of Coordination Chemistry, 67, 9, 1639-1651
  AUTHOR;　Nagasaki, Toshihiro; Miyoshi, Yusuke; Koikawa, Masayuki; Yamada, Yasunori
  
• Homo- and hetero-dinuclear nickel(II), copper(II), and oxidovanadium(IV) complexes of a Schiff-base-fused phthalocyanine with 2,6-dimethylphenoxy and t-butyl groups;　2014/01
  ANNOUNCEMENT INFO.;　Inorganica Chimica Acta, 409, 433-440
  AUTHOR;　Takahisa Ikeue, Toshiro Fukahori, Teppei Mitsumune, Koyuru Ueda, Kazusa Fujii, Satoshi Kurahashi, Masayuki Koikawa, Tamotsu Sugimori, Ichiro Hiromitsu, Katsumi Yoshino, Masahiro Mikuriya, Makoto Handa
  
• Copper(II)–azido complexes constructed from polypyridyl amine ligands;　2013/04
  ANNOUNCEMENT INFO.;　Polyhedron, 59, 17-22
  AUTHOR;　Franz A. Mautner, Masayuki Koikawa, Masahiro Mikuriya, Emily V. Harrelson, Salah S. Massoud
  
• Synthesis and magnetic property of cobalt hydroxide carbonate and cobalt oxide nonowires;　2013
  ANNOUNCEMENT INFO.;　Crystal Engineering Communication, 14, 7374-7381
  AUTHOR;　M. Yada, Y. Inoue, M. Koikawa, T. Torikai, T. Watari
  
• Synthesis and Crystal Structure of Bis{2-[(2-Hydroxymethylphenyl)iminomethyl] phenolato}chromium(III) nitrate monohydrate;　2012/03
  ANNOUNCEMENT INFO.;　, 28, 33-34
  AUTHOR;　Masayuki Koikawa,Takashi Toyofuku, Masahiro Muto, Yasunori Yamada, and Tadashi Tokii
  
• Synthesis and Crystal Structure of a Dinuclear Manganese(III) Complex of 1-[(2-Hydroxymethylphenyl)iminomethyl]-2-naphthol;　2010/11
  ANNOUNCEMENT INFO.;　X-ray Structure Analysis Online, 26, 11, 71-72
  AUTHOR;　R. Matsunaga, Y. Yamada, M. Koikawa, and T. Tokii
  
• Formation of 1-D ladder- and 2-D sheet-like networks due to stereospecific π-π stacking and hydrogen bonding between enantiomeric sulfur-bridged dinuclear complexes of penicillaminates;　2010/03
  ANNOUNCEMENT INFO.;　Journal of Coordination Chemistry, 63, 5, 742-761
  AUTHOR;　Yasunori Yamada, Miyuki Kono, Yusuke Miyoshi, Toshihiro Nagasaki, Masayuki Koikawa, Tadashi Tokii
  
• Synthesis and Crystal Structure of a Mononuclear Copper(II) Complex of N,N’-Bis-2,3,4-trihydroxybenzylidene-1,2-phenylendiamine;　2008/12
  ANNOUNCEMENT INFO.;　Anal. Scienc.: X-ray Structure Analysis Online, 24, x283-x284
  AUTHOR;　M. Koikawa, Y. Matsuda, and T. Tokii
  
• Synthesis and Structure of Mononuclear Iron(III) Complex of 6-Hydroxy-2-(5-bromo-2- hydroxyphenyl)-5-(5-bromosalicylideneamino)benzoxazole;　2008/01
  ANNOUNCEMENT INFO.;　Anal. Scienc.: X-ray Structure Analysis Online, 24, x47-x48
  AUTHOR;　M. Muto, M. Koikawa, and T. Tokii
  
• Syntheses, structures, and reactivities of novel binuclear ruthenium(II) complexes with bis(μ-phosphinato) bridges;　2007/03
  ANNOUNCEMENT INFO.;　Journal of Coordination Chemistry, 60, 2, 143-151
  AUTHOR;　K. Koga, Y. Yamada, M. Koikawa, and T. Tokii
  
• Bis{2-[2-(hydroxymethyl)phenyliminomethyl]phenolato}cobalt(III) nitrate monohydrate;　2007/01
  ANNOUNCEMENT INFO.;　Acta Crystallographica Section E, 63, 64-66
  AUTHOR;　Masahiro Muto, Natsumi Nakagawa, Masayuki Koikawa, and Tadashi Tokii
  
• Stereospecific Dimerization through p-Conjugated Systems of Sulfur-Bridged Dinuclear Cobalt(III)-Platinum(II) Complexes of 1,2-Propane-diamine;　2007
  ANNOUNCEMENT INFO.;　Journal of Coordination Chemistry, 60, 4, 607-617
  AUTHOR;　Y. Yamada, M. Noda, M. Inoue, Y. Miyashita, K. Okamoto, M. Koikawa, T. Tokii
  
• Tripodal Trimanganese(III) Complexes of New Unsymmetrical Pentadentate Ligands Derived from 2-(Salicylideneamino)phenol: Syntheses, Crystal Structures and Properties;　2007
  ANNOUNCEMENT INFO.;　European Journal of Inorganic Chemistry, 23, 3701-3709
  AUTHOR;　Masahiro Muto, Naoya Hatae, Yumiko Tamekuni, Yasunori Yamada, Masayuki Koikawa, and Tadashi Tokii
  
• Effects of counter anions on stereospecific interactions through π-conjugated systems of sulfur-bridged dinuclear cobalt(III)–platinum(II) complexes with optically active penicillaminates: Synthetic, structural, and spectroscopic studies;　2007
  ANNOUNCEMENT INFO.;　Polyhedron, 26, 12, 2749-2760
  AUTHOR;　Y. Yamada, M. Inoue, Y. Miyashita, K. Okamoto, M. Koikawa, and T. Tokii
  
• Syntheses, Structures, and Magnetic Properties of Tetranuclear NiII4 and NiII2MnIII2 Complexes with ONO Tridentate Ligands;　2005
  ANNOUNCEMENT INFO.;　Polyhedron, 6, 157-162
  AUTHOR;　Masayuki Koikawa, Masaaki Ohba, Tadashi Tokii
  
• Crystal Structures and magnetic Properties of Tetranuclear Copper(II) Complexes of N-(2-Hydroxymethylphenyl)salicylideneimine with a Defective Double-Cubane core;　2004
  ANNOUNCEMENT INFO.;　Inorganica Chimica Acta, 357, 2635-2642
  AUTHOR;　Masayuki Koikawa, Hiromi Yamashita, Tadashi Tokii
  
• Novel Dinuclear Copper(II) Complexes with syn-syn and syn-anti Coordination Modes of Bis(μ-phosphinato)-bridges: Structures and Magnetic Properties;　2004
  ANNOUNCEMENT INFO.;　Chemistry letters, 33, 12, 1606-1607
  AUTHOR;　Koichi Koga, Miki Ohtsubo, Yasunori Yamada, Masayuki Koikawa, and Tadashi Tokii
  
• Synthesis, Structure, and Characterization of Dicopper (II) Complex with a New Amidate Ligand;　2003
  ANNOUNCEMENT INFO.;　Inorganic Chemistry Communications, 6, 157-161
  AUTHOR;　Masayuki Koikawa, Hiromi Yamashita, Tadashi Tokii
  
• Syntheses, Magnetic Properties, and Reactivity of Dinuclear Oxovanadium (IV) and Copper (II) Complexes with ($\mu$-diphenylphosphinato)-bridges;　2003
  ANNOUNCEMENT INFO.;　Inorganic Chemistry Communications, 6, 374-376
  AUTHOR;　Koichi Koga, Makiko Ueno, Masayuki Koikawa, Tadashi Tokii
  
• Dichlorobis [N-(2-oxymethylphenyl)salycylideneiminato] diiron (III);　2003
  ANNOUNCEMENT INFO.;　Acta Crystallographica Section E, E60, m239-m241
  AUTHOR;　Masayuki Koikawa, Kumiko Iwashita, and Tadashi Tokii
  

General Lectures

• アゾ基を有する新規ONO三座配位子による多核金属錯体の合成と性質;　2021/09
  ANNOUNCEMENT INFO.;　
  AUTHOR;　
  
• Structure and magnetic properties of an oxidovanadium(IV) complex with five dimethylsulfoxide ligands;　2018/07
  ANNOUNCEMENT INFO.;　43rd International Conference on Coordination Chemistry (ICCC2018)
  AUTHOR;　H. Sakiyama, T. Abiko, K. Yoshida, R. Mitsuhashi, M. Mikuriya, M. Koikawa
  
• Magneto-structural Correlation of an Octahedral High-spin Iron(II) Complex;　2017/09
  ANNOUNCEMENT INFO.;　, 1Ba-07
  AUTHOR;　Hiroshi Sakiyama, Takaaki Abiko, Masayuki Koikawa
  
• SYNTHESES, STRUCTURES, AND MAGNETIC PROPERTIES OF TETRANUCLEAR COBALT AND NICKEL COMPLEXES WITH ONO-TRIDENTATE LIGANDS;　2016/09
  ANNOUNCEMENT INFO.;　The 15th International Conference on Molecule-Based Magnets (ICMM2016), 5P-037
  AUTHOR;　Megumi Yoshitake, Yasumasa Ogata, Momoko Nishihashi, Ko Yoneda, Yasunori Yamada, Hiroshi Sakiyama, and Masayuki Koikawa
  
• Synthesis and Characterization of Polynuclear Complexes with a Polydentate igand Linked by Long Alkyl Chain;　2016/09
  ANNOUNCEMENT INFO.;　66th Japan Society of Coordination Chemistry Symposium, 2PA-035
  AUTHOR;　Yusuke UMEMOTO, Ko YONEDA, Yasunori YAMADA, Masayuki KOIKAWA
  
• Structures and Magnetic Properties of Polynuclear Co-Ni Hetero Metal Complexes with N-(2-hydroxymethylpheny)salicylideneimine;　2016/09
  ANNOUNCEMENT INFO.;　66th Japan Society of Coordination Chemistry Symposium, 1PA-043
  AUTHOR;　Yasumasa OGATA, Megumi YOSHITAKE, Ko YONEDA, Yasunori YAMADA, Masayuki KOIKAWA
  
• Synthesis and Properties of Oxovanadium(IV) Complex with Oxazolyl Phenolate Type Ligand;　2015/09
  ANNOUNCEMENT INFO.;　The 65th Japan Society of Coordination Chemistry Symposium
  AUTHOR;　Y. UMEMOTO, Y. SAKAGUCHI, K. YONEDA, Y. YAMADA, M. KOIKAWA
  
• Structures and Magnetic Properties of Polynuclear Hetero Metal Complexes with N-(2-hydroxymethylpheny)salicylideneimine;　2015/09
  ANNOUNCEMENT INFO.;　The 65th Japan Society of Coordination Chemistry Symposium, 2PA-043
  AUTHOR;　Megumi YOSHITAKE, Ko YONEDA , Yasunori YAMADA, Masayuki KOIKAWA
  
• Molecular-Capsule Assemblies of Trinuclear Macrocyclic Metal Complexes;　2012/09
  ANNOUNCEMENT INFO.;　International Conference of Coordination Chemistry, P-233
  AUTHOR;　Masayuki Koikawa, Masahiro Muto, Kosuke Morinaga, Kou Yoneda, Yasunori Yamada, Tadashi Tokii
  
• Synthesis and electrochemical properties of Mn(IV) complexes with polyanionic chelating ligands;　2010/11
  ANNOUNCEMENT INFO.;　
  AUTHOR;　Kousuke Morinaga, Masayuki Koikawa, Yasunori Yamada, Tadashi Tokii
  
• Synthesis and magnetic properties of new polynuclear manganese complexes with ONO tridentate shiff base ligands;　2010/09
  ANNOUNCEMENT INFO.;　
  AUTHOR;　Kazuhito Muraoka, Masayuki Koikawa, Yasunori Yamada, Tadasi Tokii
  
• Syntheses and Characterization of Trinuclear Macrocyclic Complexes with Polydentate Chelating Ligands with Two Separate Coordination Sites;　2010/09
  ANNOUNCEMENT INFO.;　JSCC 60th Conference
  AUTHOR;　M. Koikawa, M. Muto, K. Ohdo, Y. Yamada, and T. Tokii
  
• Syntheses and magnetic properties of polynuclear complexes with ONO tridentate ligands;　2010/09
  ANNOUNCEMENT INFO.;　JSCC 60th Conference
  AUTHOR;　Ryuji Matsunaga, Masayuki Koikawa, Yasunori Yamada, Tadshi Tokii
  
• Syntheses and catalytic activity of divalent transition metal complexes with an asymmetric chelating ligand;　2010/09
  ANNOUNCEMENT INFO.;　
  AUTHOR;　
  
• Syntheses and oxygenase-like activity of Fe(III) and Cu(II) complexes with a tripodal tetradentate ligand containg two different O-donors;　2010/09
  ANNOUNCEMENT INFO.;　
  AUTHOR;　
  
• SYNTHESES, STRUCTURES, AND CHARACTERIZATION OF TETRANUCLEAR MN-NI COMPLEXES HAVING DEFECTIVE DOUBLE-CUBANE CORE STRUCTURES;　2007/07
  ANNOUNCEMENT INFO.;　Asian Conference on Coordination Chemistry
  AUTHOR;　Masahiro Muto, Masayuki Koikawa, and Tadashi Tokii
  
• Syntheses, Structures, and Magnetic Properties of Tetranuclear NiII4 and NiII2MnIII2 Complexes with ONO Tridentate Ligands;　2004/10
  ANNOUNCEMENT INFO.;　The IXth International Conference on Molecule-based Magnets ICMM 2004 (Tsukuba)
  AUTHOR;　Masayuki Koikawaa, Masaaki Ohba, Tadashi Tokii
  
• SYNTHESES, STRUCTURE, AND ELECTROCHEMICAL PROPERTIES OF TRINUCLEAR MANGANESE(III) COMPLEXES WITH NEW POLYDENTATE LIGANDS;　2003/03
  ANNOUNCEMENT INFO.;　International Symposium, Nano-Science of Advanced Metal Complexes (Okazaki)
  AUTHOR;　Masayuki Koikawa, Naoya Hatae, Aya Katsuki, and Tadashi Tokii
  

Other Lectures

• Synthetic strategy for single-molecule magnets (SMMs) with transition metal complexes;　2023/01
  ANNOUNCEMENT INFO.;　The 12th Joint Seminar between Saga University and Liaoning University
  AUTHOR;　Masayuki Koikawa
  
• Structure and Magnetic Properties of Polynuclear Metal Complexes with Tetradentate Chain-Ligand;　2011/11
  ANNOUNCEMENT INFO.;　The seminar on the foreign researchers inviting program for international exchange
  AUTHOR;　Takayuki HASUO, Reiichiro YAMASHITA, Yasunori YAMADA, Masayuki KOIKAWA, Tadashi TOKII
  
• Structures and Characterization of Carboxylato Bridged Dioxovanadium(IV) Complexes;　2011/11
  ANNOUNCEMENT INFO.;　The seminar on the foreign researchers inviting program for international exchange
  AUTHOR;　Ryo Yoshida, Yasunori Yamada, Masayuki Koikawa, Tadashi Tokii
  

Invited Lecture, Special Lecture

• Structures and Magnetic Properties of Cyclic Trinuclear Manganese Complexes;　2013/10
  ANNOUNCEMENT INFO.;　2013 Symposium on Coordination Compounds as Molecular Magnetic Materials
  AUTHOR;　Masayuki Koikawa
  
• Syntheses and Characterization of Trinuclear Macrocyclic Complexes and Self-Assembling of Molecular Capsule;　2011/10
  ANNOUNCEMENT INFO.;　Research Center for Coordination Molecule-based Devices 'Searching for New Molecular-Magnetic Compounds' 2011 Symposium on Coordination Compounds as Molecular Magnetic Materials
  AUTHOR;　Masayuki Koikawa, Masahiro Muto, Kosuke Morinaga, Yasunori Yamada, Tadashi Tokii
  
• Syntheses and Characterization of Trinuclear Macrocyclic Complexes with Polydentate Bridging Ligands with Distinct Coordination Sites;　2008/04
  ANNOUNCEMENT INFO.;　
  AUTHOR;　M. Muto, M. Koikawa, T. Yamada, T. Tokii
  
• オキサゾリン環を含む多座配位子によるMn（III），Fe（III）錯体の合成とカタラーゼ及びSOD様活性;　2007/04
  ANNOUNCEMENT INFO.;　
  AUTHOR;