Synthesis, characterization and magnetic properties of disk-shaped particles of a cobalt alkoxide: CoII(C2H4O2)

Nassira Chakroune; Guillaume Viau; Souad Ammar; Noureddine Jouini; Patrick Gredin; Marie Josèphe Vaulay; Fernand Fiévet

doi:10.1039/B411117F

Synthesis, characterization and magnetic properties of disk-shaped particles of a cobalt alkoxide: Coⁱⁱ(C₂H₄O₂)

Nassira Chakroune,^a Guillaume Viau,*^a Souad Ammar,^a Noureddine Jouini,^b Patrick Gredin,^c Marie Josèphe Vaulay^a and Fernand Fiévet^a

Author affiliations

* Corresponding authors

^a ITODYS (CNRS UMR 7086), Université Paris 7-Denis Diderot, case 7090, 2 place Jussieu, Paris cedex 05, France
E-mail: viau@ccr.jussieu.fr

^b Laboratoire des Propriétés Mécaniques et Thermodynamiques des Matériaux (CNRS UPR 9001), Institut Galilée, 99 avenue J. B. Clément, Villetaneuse, France

^c Laboratoire de Cristallochimie du Solide, Université Paris 6-Pierre et Marie Curie, 4 place Jussieu, Paris cedex 05, France

Abstract

A cobalt alkoxide, Co(OCH₂CH₂O), has been prepared from the reaction of cobalt acetate with ethanediol. This compound crystallizes as disk-shaped particles with diameter and thickness in the 0.4–1 µm and 100–250 nm ranges, respectively. Structural characterization (X-ray and electron diffraction) shows a layered arrangement with a brucite-like structure presenting a turbostratic disorder. The interlayer spacing and the Co⋯Co distance within the layer are c = 8.27 Å and a = 3.09 Å, respectively. UV-visible spectroscopy studies established that the Co(II) ions are located on octahedral sites. IR spectroscopy showed that the ethylene glycolate anions (OCH₂CH₂O)²⁻ chelate the Co(II) cations. The magnetic properties of the compound were measured in the range of 2–300 K. Below 20 K, the compound exhibits 3D ferromagnetic order and the hysteresis loop shows a very high remanence-to-saturation ratio typical of a uniaxial magnetocrystalline anisotropy.

Article information

https://doi.org/10.1039/B411117F

Article type

Paper

Submitted

20 Jul 2004

Accepted

04 Oct 2004

First published

10 Jan 2005

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New J. Chem., 2005,29, 355-361

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Synthesis, characterization and magnetic properties of disk-shaped particles of a cobalt alkoxide: Co^II(C₂H₄O₂)

N. Chakroune, G. Viau, S. Ammar, N. Jouini, P. Gredin, M. J. Vaulay and F. Fiévet, New J. Chem., 2005, 29, 355 DOI: 10.1039/B411117F

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