Ferromagnetic Coupling through Spin Polarization in a Dinuclear Copper(II) Metallacyclophane

Fernández, Isabel; Ruiz, Rafael; Faus, Juan; Julve, Miguel; Lloret, Francesc; Cano, Joan; Ottenwaelder, Xavier; Journaux, Yves; Muñoz, M. Carmen

doi:10.1002/1521-3773(20010817)40:16<3039::aid-anie3039>3.0.co;2-p

Cited by 149 publications

(130 citation statements)

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“…The explanation of these large values for the coupling constant has its origin in the spin-polarization mechanism (Figure 18). [72][73][74] [75] This feature allows the control of the magnetic properties of polynuclear complexes or CPs synthesized with these copper (II 6 ]·6H 2 O} n (2D-CoCumpba) [76] [77] have been solved (Figure 19). Each dicopper(II) metallacyclophane entity acts as a tetrakis(bidentate) ligand through the carbonyl oxygen atoms of the oxamate ligand atoms toward diaquametal(II) units, yielding a brick-wall rectangular layer with a (6,3) net topology.…”

Section: D Coordination Polymersmentioning

confidence: 99%

Design of Magnetic Coordination Polymers Built from Polyoxalamide Ligands: A Thirty Year Story

et al. 2018

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Abstract:The aim of this review is to pay tribute to the legacy of O. Kahn. Kahn's credo was to synthesize magnetic compounds with predictable structure and magnetic properties. This is illustrated herein with results obtained by Kahn's group during his Orsay period thirty years ago, but also on the basis of our recent results on the synthesis of coordination polymers with oxamate ligands. The first part of this review is devoted to a short description of the necessary knowledge in physics and theoretical chemistry that Kahn and his group have used to select oxamate ligands, the complex-as-ligand strategy and the synthesis of heterobimetallic systems. Then, we describe the strategies we have later used to obtain the desired target compounds. The use of complexes as building-blocks, associated to a control of the metal ions chirality and stoichiometry, allowed us to obtain coordination polymers with predictable dimensionality. For the synthesis of single-chain magnets (SCMs) we show IncipitFor this thematic issue dedicated to the attractive legacy of Olivier Kahn, we decided to write this paper on magnetic coordination polymers built from polyoxalamide ligands. Some of the authors of this paper were part of the exciting adventure at the time of the creation of the Kahn's group at the University of Paris-Sud. Kahn's credo was to synthesize magnetic compounds with predictable structure and magnetic properties and in order to achieve this goal one needs some backgrounds in physics, theory and synthetic chemistry. We have therefore tried that the ligand chemical flexibility makes the isolation of the chains in the solid and the occurence of slow magnetic relaxation possible. For 1D and 2D molecule-based magnets (MBMs), the magnetic ordering strongly depends on the interchain or interplane interactions, which are difficult to control. Again the flexibility of the oxamate ligands allowed their strengthening in the solid sate, yielding MBMs with critical temperatures up to 30 K. We will also present our results on 3D coordination polymers, particularly on the porous magnets displaying large octagonal channels. This family of porous MBMs possess outstanding chemical properties, such as post-synthetic transformation in the solid state. Finally, we will also show that oxamate ligands allows the design of multifunctional materials, as in the case of the first chiral SCM. Overall, the results presented in this review show the impressive potential the oxamate ligands have for the design of coordination polymers.throughout this contribution to describe the historical process and the approach of the group's behind the choice of oxamate and oxamidate ligands to synthesize heterometallic coordination polymers.

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Section: D Coordination Polymersmentioning

confidence: 99%

Design of Magnetic Coordination Polymers Built from Polyoxalamide Ligands: A Thirty Year Story

et al. 2018

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“…The amino function allows the attachment of chelating arms directly at the nitrogen donor atoms. Two of the N-functionalized ligands 19 coordinate two Cu II ions in a meta-phenylene fashion resulting in the formation of a metallacyclophane [83]. This bridging unit results in a ferromagnetic coupling of J ¼ þ8.4 cm À1 .…”

Section: Applications Of the Spin-polarization Mechanism To Transitiomentioning

confidence: 99%

Spin-polarization in 1,3,5-trihydroxybenzene-bridged first-row transition metal complexes

Glaser

Theil

Heidemeier

2008

Comptes Rendus. Chimie

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“…Among such ligand frameworks are (end-on) N 3 -groups [4,5] and m-phenylene links (the latter usually facilitating ferromagnetism through a spin-polarisation mechanism). [6,7] Even more desirable in the preparation of versatile functional materials are systems capable of exhibiting different properties by introducing subtle changes of environment or of chemical nature.…”

Section: Introductionmentioning

confidence: 99%

Coordination Dependence of Magnetic Properties within a Family of Related [Fe^II₂] Complexes of a Triazine‐Based Ligand

et al. 2006

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The coordination chemistry of the polydentate ligand 2,4,6-tris(dipyridin-2-ylamino)-1,3,5-triazine (dpyatriz) with Fe II has been explored, leading through variation of the counterion and the solvent system to the preparation of three different dinuclear complexes: 4 ) 4 (2) and [Fe 2 (dpyatriz) 2 Cl 2 ](CF 3 SO 3 ) 2 (3). The X-ray structure of these compounds has revealed that besides the difference in the noncoordinated anion, complex 1 differs from complex 2 only in the nature of the terminal ligands. Bulk magnetisation studies and Mössbauer spectroscopy have shown that such a subtle difference produces a change to the crystal field on the metal atoms, originating an important disparity of the magnetic behaviour. Thus, complex 1 experiences a partial spin crossover centred at approximately 265 K, whereas com-

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Ferromagnetic Coupling through Spin Polarization in a Dinuclear Copper(II) Metallacyclophane

Cited by 149 publications

References 30 publications

Design of Magnetic Coordination Polymers Built from Polyoxalamide Ligands: A Thirty Year Story

Design of Magnetic Coordination Polymers Built from Polyoxalamide Ligands: A Thirty Year Story

Spin-polarization in 1,3,5-trihydroxybenzene-bridged first-row transition metal complexes

Coordination Dependence of Magnetic Properties within a Family of Related [Fe^II₂] Complexes of a Triazine‐Based Ligand

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Ferromagnetic Coupling through Spin Polarization in a Dinuclear Copper(II) Metallacyclophane

Cited by 149 publications

References 30 publications

Design of Magnetic Coordination Polymers Built from Polyoxalamide Ligands: A Thirty Year Story

Design of Magnetic Coordination Polymers Built from Polyoxalamide Ligands: A Thirty Year Story

Spin-polarization in 1,3,5-trihydroxybenzene-bridged first-row transition metal complexes

Coordination Dependence of Magnetic Properties within a Family of Related [FeII2] Complexes of a Triazine‐Based Ligand

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Coordination Dependence of Magnetic Properties within a Family of Related [Fe^II₂] Complexes of a Triazine‐Based Ligand