Ferromagnetic transition in a bimetallic molecular system

Yu, Peng; Verdaguer, Michel; Kahn, Olivier; Sletten, Jorunn; Renard, Jean

doi:10.1021/ja00283a059

Cited by 160 publications

(114 citation statements)

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“…In the mean field approximation, the Curie temperature (T C ) for a ferrimagnet with two kinds of magnetic centers is given by Equation (2). (2) where J AB is the interaction between the spins S A and S B , and Z A and Z B are the number of neighbors for A and B respectively. All the involved parameters (magnitude of the interaction, spin size and number of neighbors) have to be as large as possible in order to get high ordering temperatures.…”

Section: A Hint Of Physicsmentioning

confidence: 99%

“…[2] Coordination of two oxamate ligands to a copper(II) ion through the deprotonated amidatenitrogen and carboxylate-oxygen atoms leads to a very stable dianionic complex that can act as a bis-bidentate ligand through its free oxygen atoms, towards either fully solvated metal ions or preformed complexes bearing labile ligands in their coordination sphere. To further increase the stability of the dianionic monometallic copper(II) complex, Yu used tetradentate ligands containing two oxamate groups.…”

Section: What About the Ligand?mentioning

confidence: 99%

“…This topic started at the end of the eighties, aiming at obtaining magnets with interesting properties such as transparency or low density, which are also tunable by organic chemistry and easily synthesizable at low temperatures under soft chemistry conditions. [1][2][3] More recently, the discovery of Glauber's dynamics in 1D CPs [4] has renewed the interest in the synthesis of this type of compounds to obtain single-chain magnets (SCMs). For MBM or SCM systems, it is compulsory to gather a large number of strongly interacting magnetic centers.…”

Section: Introductionmentioning

confidence: 99%

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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: A Hint Of Physicsmentioning

confidence: 99%

Section: What About the Ligand?mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2018

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“…Kahn et al 3 synthesized another series of bimetallic chain compounds ACu͑pbaOH͒ ϫ͑H 2 O͒ 3 · nH 2 O ͓A = Fe, Co, Ni, Cu; pbaOH = 2-hydroxys -1 , 3-propylenebis͑oxamato͒ =C 7 H 6 N 2 O 7 ͔, one of which indeed attained the three-dimensional ferromagnetic order at low temperatures. 4 Caneschi et al 5 took an alternative strategy of bringing into interaction metal ions and stable organic radicals. This idea was developed toward polymeric chain compounds.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature thermodynamics of one-dimensional alternating-spin Heisenberg ferromagnets

Yamamoto

Hori

2005

Phys. Rev. B

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Motivated by a novel bimetallic chain compound in which alternating magnetic centers are ferromagnetically coupled, we investigate thermodynamic properties of one-dimensional spin-͑S , s͒ Heisenberg ferromagnets both numerically and analytically. On the one hand, quantum Monte Carlo calculations illuminate the overall thermal behavior. The specific heat may exhibit a double-peaked structure at intermediate temperatures for S տ 3s in general. On the other hand, a modified spin-wave theory precisely describes the low-temperature properties. Expanding the specific heat and the magnetic susceptibility, we reveal an analogy and a contrast between mixed-spin ferromagnets and ferrimagnets.

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“…4 Diversos tipos de ligantes podem ser empregados na construção de redes metalorgânicas poliméricas, porém só vão ser enfocados aqui aqueles contendo "pontes" do tipo oxamato (NHC 2 O 3 2-), que é bastante similar ao oxalato (C 2 O 4 2-), onde um átomo de oxigênio é substituído por um de nitrogênio. 5 Esta substituição possibilita a inserção de grupos orgânicos, como anéis aromáticos ou grupos alifáticos que podem alterar algumas de suas propriedades como, por exemplo, alterando a densidade eletrônica em um átomo ou outro, o que influencia fortemente nas propriedades magnéticas do composto. 6 Outra grande vantagem proveniente da inserção de grupos químicos se situa em uma possibilidade de controle das interações intermoleculares.…”

Section: Introductionunclassified

Síntese, caracterização e estudo das propriedades magnéticas de um polímero de coordenação contendo cobalto(II) e cobre(II)

Cunha¹,

Stumpf²,

Pereira³

et al. 2012

Quím. Nova

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Ferromagnetic transition in a bimetallic molecular system

Cited by 160 publications

References 0 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

Low-temperature thermodynamics of one-dimensional alternating-spin Heisenberg ferromagnets

Síntese, caracterização e estudo das propriedades magnéticas de um polímero de coordenação contendo cobalto(II) e cobre(II)

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