μ-Acetato-di-μ-phenolato-metal(II)cobalt(II) (metal = Fe, Co, Ni, Cu, Zn) complexes with low-spin Co(II): Synthesis, structures, and magnetism

Kohta Matsumoto, Noboru Sekine, Keisuke Arimura, Masaaki Ohba, Hiroshi Sakiyama, Hisashi Okawa

Research output: Contribution to journalArticle

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Abstract

The dinucleating macrocyclic ligand (L2;2)2-, prepared by the [1:1] cyclic condensation of N,N′-dimethyl-N,N′- ethylenedi(5-bromo-3-formyl-2-hydroxybenzylamine) and ethylenediamine, has dissimilar N(amine)2O2 and N(imine)2O 2 metal-binding sites sharing two phenolic oxygen atoms. It has afforded μ-acetato-di-μ-phenolato-metal(II)cobalt(II) complexes (metal(II) = FeII, CoII, NiII, CuII, Zn II). X-ray crystallographic studies indicate that the MII is bound to the N(amine)2O2 site and has a square-pyramidal geometry with an acetate oxygen at the axial site. The Co II bound to the N(imine)2O2 site has a square-pyramidal geometry with an acetate oxygen at the apex or a distorted octahedral geometry with further coordination of a methanol molecule. The CoII in the N(imine)2O2 site is of low-spin and has one unpaired electron in its dz2 orbital. Magnetic studies indicate an antiferromagnetic interaction in the FeCo and CoCo complexes whereas a ferromagnetic interaction in the NiCo and CuCo complexes. The magnetic properties of the complexes are discussed in terms of the electronic structure of the MII ion and the dinuclear MCo core structure.

Original languageEnglish
Pages (from-to)1343-1351
Number of pages9
JournalBulletin of the Chemical Society of Japan
Volume77
Issue number7
DOIs
Publication statusPublished - Jul 1 2004

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Imines
Magnetism
Cobalt
ethylenediamine
Metals
Oxygen
Amines
Geometry
Acetates
Coordination Complexes
Electronic structure
Methanol
Condensation
Magnetic properties
Binding Sites
Ions
Ligands
X rays
Atoms
Molecules

All Science Journal Classification (ASJC) codes

  • Chemistry(all)

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μ-Acetato-di-μ-phenolato-metal(II)cobalt(II) (metal = Fe, Co, Ni, Cu, Zn) complexes with low-spin Co(II) : Synthesis, structures, and magnetism. / Matsumoto, Kohta; Sekine, Noboru; Arimura, Keisuke; Ohba, Masaaki; Sakiyama, Hiroshi; Okawa, Hisashi.

In: Bulletin of the Chemical Society of Japan, Vol. 77, No. 7, 01.07.2004, p. 1343-1351.

Research output: Contribution to journalArticle

Matsumoto, Kohta ; Sekine, Noboru ; Arimura, Keisuke ; Ohba, Masaaki ; Sakiyama, Hiroshi ; Okawa, Hisashi. / μ-Acetato-di-μ-phenolato-metal(II)cobalt(II) (metal = Fe, Co, Ni, Cu, Zn) complexes with low-spin Co(II) : Synthesis, structures, and magnetism. In: Bulletin of the Chemical Society of Japan. 2004 ; Vol. 77, No. 7. pp. 1343-1351.
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abstract = "The dinucleating macrocyclic ligand (L2;2)2-, prepared by the [1:1] cyclic condensation of N,N′-dimethyl-N,N′- ethylenedi(5-bromo-3-formyl-2-hydroxybenzylamine) and ethylenediamine, has dissimilar N(amine)2O2 and N(imine)2O 2 metal-binding sites sharing two phenolic oxygen atoms. It has afforded μ-acetato-di-μ-phenolato-metal(II)cobalt(II) complexes (metal(II) = FeII, CoII, NiII, CuII, Zn II). X-ray crystallographic studies indicate that the MII is bound to the N(amine)2O2 site and has a square-pyramidal geometry with an acetate oxygen at the axial site. The Co II bound to the N(imine)2O2 site has a square-pyramidal geometry with an acetate oxygen at the apex or a distorted octahedral geometry with further coordination of a methanol molecule. The CoII in the N(imine)2O2 site is of low-spin and has one unpaired electron in its dz2 orbital. Magnetic studies indicate an antiferromagnetic interaction in the FeCo and CoCo complexes whereas a ferromagnetic interaction in the NiCo and CuCo complexes. The magnetic properties of the complexes are discussed in terms of the electronic structure of the MII ion and the dinuclear MCo core structure.",
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AU - Matsumoto, Kohta

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