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
Copper(II) Compounds Extended by 5-Carboxysalicylaldehyde and Its Schiff Bases: Interplay of Two Metal-Binding Sites and Intermolecular Stacking Contributing to Their Network and Bulk Structures
Reki Sakamoto,Masaaki Ohba,Nobuo Fukita,Kazuhiro Takahashi,Hisashi Okawa,Laurence K. Thompson +5 more
TL;DR: In this paper, two mixed-ligand complexes, [Cu(Hcasal)(bpy)]ClO4 (1) and [cu(casal), bpy]·2H2O (2) (bpy = 2,2′-bipyridine), were derived by condensing H2casal with N, N-dimethylethylenediamine and bis(3-aminopropyl)amine, respectively.
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Synthesis and Magnetic Property of Binuclear Oxovanadium(IV) Complex of 2,6-Diformyl-4-methylphenol Bis(benzoylhydrazone)
Masatomi Sakamoto,Shoichi Itose,Tomitaro Ishimori,Naohide Matsumoto,Hisashi Okawa,Sigeo Kida +5 more
TL;DR: In this paper, a binuclear oxovanadium(IV) complex, [(VO)2L(OCH3)], has been synthesized, where H3L denotes 2,6-diformyl-4-methylphenol bis(benzoylhydrazone).
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Synthesis and magnetic properties of nickel(II)-gadolinium(III) and copper(II)-gadolinium(III) complexes of a compartmental ligand, N,N'-bis(3-hydroxysalicylidene)-2-aminobenzylamine
Masatomi Sakamoto,Motoko Kumagai,Hiroshi Sakiyama,Yuzo Nishida,Yoshihiko Sadaoka,Akira Matsumoto,Masaaki Ohba,Hisashi Okawa +7 more
TL;DR: Sakata et al. as discussed by the authors investigated the magnetic properties of dinucleating ligand complexes and found that the intermolecular antiferromagnetic interaction is operating in the Ni(II)-Gd(III) complex, whereas the ferromagnetic spin-spin interaction was operating between Cu(II) and Gd (III) ions in the Cu( II)-GD(III), where H4dhbabza denotes N,N′-bis(3-hydroxysalicyli-dene)-2-aminobenzylamine
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New Pyridine-modified Macrocycle and Its Ability to Encapsulate Four Divalent Metal Ions [Nickel(II), Manganese(II), and Zinc(II)] into the Ring
Eiji Asato,Hideki Furutachi,Chikahiro Tamanaha,Hideo Matsudaira,Masaaki Ohba,Hisashi Okawa,Masahiro Mikuriya +6 more
TL;DR: In this article, a large phenol and polyether chain-based macrocycle H2Lpy possessing four pyridylmethyl groups as pendant donors was prepared and its ability to encapsulate four divalent metal ions [Ni(II), Mn(II, and Zn(II)] was confirmed by IR and NMR spectroscopy and X-ray crystallography.
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Palladium(II)-lanthanide(III) complexes of a dinucleating ligand, N,N'-bis(3-carboxysalicylidene)ethylenediamine
Masatomi Sakamoto,Yasutaka Kitakami,Yuzo Nishida,Yoshihiko Sadaoka,Junko Yuzurihara,Yutaka Fukuda,Hisashi Okawa +6 more
TL;DR: In this article, the magnetic moments at room temperature were within the range reported for the tervalent lanthanide compounds, where H4fsaen denotes N,N'-bis(3-carboxysalicylidene)-ethylenediamine.
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