Issue 26, 2006
From the journal:

Journal of Materials Chemistry

An approach to chiral magnets using α-hydroxycarboxylates†

Adel Beghidja,ab   Guillaume Rogez,‡a   Pierre Rabu,‡*a   Richard Welter*b  and  Marc Drillon‡a  

* Corresponding authors

a Institut de Physique et Chimie des Matériaux de Strasbourg, UMR 7504 CNRS-ULP, 23 rue du Loess, BP 43, 67034 Strasbourg cedex 2, France
E-mail: pierre.rabu@ipcms.u-strasbg.fr
Fax: +33 3.88.10.72.47

b Laboratoire DECOMET, LC003 7177 CNRS-ULP, ILB, Université Louis Pasteur, 4, rue Blaise Pascal, 67000 Strasbourg, France
E-mail: welter@chimie.u-strasbg.fr
Fax: +33 3.90.24.12.29

Abstract

Carboxylate-bridged complexes of transition metals, MII = MnII, FeII, CoII, NiII, CuII, were synthesized by reaction of MII salts with (R)-mandelic acid ((R)-2-hydroxyphenylacetic acid), methoxymandelic acid (racemic) (2-methoxyphenylacetic acid) and (R)-malic acid ((R)-2-hydroxybutanedioic acid) under hydrothermal conditions. A wide variety of structures has been obtained, with various dimensionalities: 3D networks when the malic diacid is used, 2D networks with the mandelic acid, 1D isolated chains organised in planes for the Co and Cu compounds with MeOmandelic acid and monomers for the Ni analogue. These complexes have been fully characterized structurally and magnetically. During the reaction process, the (R)-mandelic ligand undergoes a racemisation reaction but the compounds obtained with (R)-malic acid are chiral and exhibit metal-centred circular dichroism. Extensive magnetic characterization of all compounds indicates rather weak coupling interactions between paramagnetic centres linked through carboxylate bridges. Curie-like paramagnetic, antiferromagnetic, ferromagnetic or weak ferromagnetic behaviour was observed and is discussed on the basis of the structural features. The bimetallic compounds Mn0.63Co0.37(R)-malate monohydrate (12) and Mn0.79Ni0.21(R)-malate monohydrate (13) are new examples of chiral magnets.

Graphical abstract: An approach to chiral magnets using α-hydroxycarboxylates

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Article information

DOI
https://doi.org/10.1039/B603014A
Article type
Paper
Submitted
28 Feb 2006
Accepted
28 Apr 2006
First published
18 May 2006

J. Mater. Chem., 2006,16, 2715-2728

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An approach to chiral magnets using α-hydroxycarboxylates

A. Beghidja, G. Rogez, P. Rabu, R. Welter and M. Drillon, J. Mater. Chem., 2006, 16, 2715 DOI: 10.1039/B603014A

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