The influence of the lattice geometry on the thermodynamical properties of two-dimensional spin systems

Mombelli, Bruno; Kahn, Olivier; Leandri, J.; Leroyer, Y.; Meshkov, S. V.; Meurdesoif, Yann

doi:10.1088/0953-8984/10/23/019

Cited by 3 publications

(1 citation statement)

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“…The magnetic behavior of these two compounds indicates that the Cu II -Ru III interaction is antiferromagnetic whereas the Mn II -Ru III interaction is ferromagnetic. The magnetic behavior of the Mn II -Ru III and Fe II -Ru III compounds could by analyzed quantitatively with a theoretical model for a honeycomb lattice [54]. The spin Hamiltonian considered in the model is given in Eq.…”

Section: Examples Of Ru(iii)-based Compoundsmentioning

confidence: 99%

Bimetallic Magnets: Present and Perspectives

Mathonière

Sutter

Yakhmi

2003

Magnetism: Molecules to Materials

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An important branch of the molecular magnetism deals with molecular systems with bulk physical properties such as long-range magnetic ordering. The first molecular compounds with spontaneous magnetization below a critical temperature were reported during the eighties [1, 2]. These pioneering reports encouraged many research groups in organic, inorganic, or organometallic chemistry to initiate activity on this subject, and many new molecule-based magnets have been designed and characterized. A tentative classification can arise from the chemical nature of the magnetic units involved in these materials -organic-or metal-based systems and mixed organic-inorganic compounds. Of materials based only on magnetic metal complexes, several families such as the oxamato, oxamido, oxalato-bridged compounds and cyanide-bridged systems play an important role in the field of molecular magnetism. This contribution focuses mainly on molecule-based magnets involving oxamato and oxamido complexes. The most extensively used spin carriers are 3d transition metal ions. The magnetic interactions between these ions are now well understood and enable the rational synthesis of materials. This aspect will be highlighted in the first part of this contribution. The heavier homologs from the second and third series have been envisaged only recently for the construction of heterobimetallic materials. In the second part of this chapter we will briefly discuss the very encouraging first results obtained with such ions.In 1995 Olivier Kahn wrote a paper reviewing the magnetism of heterobimetallic compounds [3]. An important part of this review was devoted to finite polynuclear compounds, which can be considered as models for the study of exchange interactions. Magnetic ordering is a three dimensional property, however, and the design of a molecule-based magnet requires control of the molecular architecture in the three directions of space. The results obtained in bimetallic supra-molecular materials by our group and others show different features:• the dimensionality can be controlled by the stoichiometry of the reagents during the synthesis or by the number of solvation molecules; 1 This chapter is dedicated to the memory of Professor Olivier Kahn who passed away suddenly on December 8, 1999. Many of the illustrative examples used in this contribution are results obtained by his group. Bimetallic Magnets: Present and Perspectives Fig. 1. Structure of the trinuclear cation [{Ni(cth) 2 }Cu(pba)] 2+ [7] (reproduced with permission;

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Section: Examples Of Ru(iii)-based Compoundsmentioning

confidence: 99%

Bimetallic Magnets: Present and Perspectives

Mathonière

Sutter

Yakhmi

2003

Magnetism: Molecules to Materials

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Reversible Solvatomagnetic Switching in a Spongelike Manganese(II)–Copper(II) 3D Open Framework with a Pillared Square/Octagonal Layer Architecture

Ferrando-Soria

Ruiz-Garcı́a

Cano

et al. 2012

Chemistry A European J

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The concept of "molecular magnetic sponges" was introduced for the first time in 1999 by the creative imagination of the late Olivier Kahn. It refers to the exotic spongelike behavior of certain molecule-based materials that undergo a dramatic change of their magnetic properties upon reversible dehydration/rehydration processes. Here we report a unique example of a manganese(II)-copper(II) mixed-metal-organic framework of formula [Na(H(2)O)(4)](4)[Mn(4){Cu(2)(mpba)(2)(H(2)O)(4)}(3)]·56.5H(2)O (1) (mpba=N,N'-1,3-phenylenebis(oxamate)). Compound 1 possesses a 3D Mn(II)(4)Cu(II)(6) pillared layer structure with mixed square and octagonal pores of approximate dimensions 1.2×1.2 nm and 2.1×3.0 nm, respectively, hosting a large amount of crystallization H(2)O molecules and hydrated Na(I) countercations as guests. It reversibly switches from a crystalline hydrated phase with long-range ferromagnetic ordering at a rather high critical temperature (T(c)) of 22.5 K to an amorphous dehydrated phase with T(c) as low as 2.3 K, which is accompanied by a breathing-type dynamic effect involving a large crystal volume (ca. 45%) and color changes after water desorption/adsorption. The combination of both the open-framework structure and the spongelike optical, mechanical, and magnetic switching behavior in this new class of oxamato-based porous magnets offers fascinating possibilities in designing multifunctional materials for host-guest molecular sensing.

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