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Syntheses, Structures and Magnetic Properties of Layered Metal(II) Mandelates

✍ Scribed by Adel Beghidja; Sylvain Hallynck; Richard Welter; Pierre Rabu

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
228 KB
Volume
2005
Category
Article
ISSN
1434-1948

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✦ Synopsis

Abstract

A series of Mn^II^, Fe^II^, Co^II^, Ni^II^ and Cu^II^ layered mandelates has been synthesised in the form of crystalline powders by a hydrothermal route. The five compounds are isostructural with the copper analogue, also obtained in a single crystal form, except that the latter shows a strong Jahn−Teller distortion of the coordination spheres around the Cu^II^ centres. The complexes crystallise in the monoclinic centrosymmetric space group __P__2~1~/a and their structures consist of layers of six‐coordinate metal(II) ions interconnected through carboxylato bridges in a diamond‐like network. The magnetic data indicate very small antiferromagnetic in‐plane couplings for 1, 2, 3 and 5, with J/k~B~ = −0.122 K for 1. The Ni^II^ compound 4 exhibits ferromagnetic coupling within the layers (J/k~B~ = +1.213 K) and ferromagnetic 3D ordering can be observed at T~C~ = 2.7 K. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)

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## Abstract This paper describes the syntheses and crystal structures of two new copper(II) diphosphonates with mixed ligands: [Cu~3~(hedpH)~2~(4,4′‐bipy)(H~2~O)~2~]·2H~2~O (1) and [Cu~3~(hedpH)~2~(4,4′‐azpy)(H~2~O)~2~]·1.6H~2~O (2) (hedp = 1‐hydroxyethylidenediphosphonate, 4,4′‐bipy = 4,4′‐bipyrid