Hisashi Okawa
Kyushu University
296 Papers
4.4K Citations
Hisashi Okawa is an academic researcher from Kyushu University. The author has contributed to research in topics: Copper & Crystal structure. The author has an hindex of 40, co-authored 296 publications.
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Papers
Synthesis and Redox Behavior of Dicobalt Complexes Having Flexible and Rigid Linkers
TL;DR: New dicobalt complexes, [CoII2L], with Schiff-base ligands (L1−L4) having two discrete metal chelating sites, which are connected to each other by flexible and rigid linkers, have been synthesized.
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Binuclear metal complexes. xvi. hetero metal binuclear complexes with n,n′-bis(3-carboxysalicylidene)ethylenediamine
TL;DR: In this article, the Curie-Weiss model was used to explain the magnetism of the Heisenberg model for the binuclear structure of N,N′-bis(3-carboxysalicylidene)ethylenediamine (H4fsaen), where M and M′ denote the metal ion coordinated by the N2O2-coordinating atoms and the O4-coordinate atoms, respectively.
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Syntheses and Characterization of Thiolate-Bridged Manganese(II) Complexes with NNS-Tridentate Thiolic Ligands
Masahiro Mikuriya,Fumiya Adachi,Hirofumi Iwasawa,Makoto Handa,Masayuki Koikawa,Hisashi Okawa +5 more
TL;DR: Manganese(II) complexes with 2]-(2-aminoethyl)amino]ethanethiol (HLa), 2-[(3-aminopropyl) amino]et al. as discussed by the authors have been synthesized and characterized by elemental analyses, infrared and electronic spectroscopies, and magnetic susceptibilities (80-300 K).
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Binuclear metal complexes. XX[1]. Antiferromagnetic spin-exchange interaction in copper(II)-nickel(II) and copper(II)-cobalt(II) hetero-metal complexes with 3-formylsalicylic acid-diamine schiff bases [2]
TL;DR: In this paper, a considerable antiferromagnetic spin exchange interaction is operating between the metal ions except for CuNi(fsaph)·2H2O, the magnetisms being interpreted in terms of the Heisenberg model.
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FeIIPbII and FeIII complexes of macrocyclic compartmental ligands: different cyclization in stepwise template synthesis using FeII/PbII or FeIII/PbII pairs
Hideki Furutachi,Hideki Furutachi,Akiko Ishida,Hitoshi Miyasaka,Hitoshi Miyasaka,Nobuo Fukita,Masaaki Ohba,Hisashi Okawa,Masayuki Koikawa +8 more
TL;DR: In this paper, the reaction of [bis(3-formyl-5-methylsalicylidene)ethylenediaminato]iron(II) with diethylenetriamine (dien) in the presence of PbII followed by the addition of NaNCS formed a FeIIPbII complex, [FePb(L1)(NCS)(DMf)(ClO4)] 1, where (L1)2)- is a dinucleating macrocyclic compartmental ligand derived from the [2∶
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