Framework-structured weak ferromagnets

Weng, Dan‐Feng; Wang, Zheming; Gao, Song

doi:10.1039/c0cs00093k

Cited by 384 publications

(184 citation statements)

References 269 publications

(296 reference statements)

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“…Thus, many coordination compounds have been synthesized with magnetic [1][2][3], electrical [4], and/or optical properties [5,6], Another hot topic in the last decades has been the incorporation of two or more properties in the same compound. Thus, multi-functional materials combining electrical conductivity and ferromagnetism [7], superconductivity and magnetism [8], chirality and magnetism [9,10], or porosity and magnetism [11], have been reported in the last two decades.…”

Section: Introductionmentioning

confidence: 99%

A Family of Lanthanoid Dimers with Nitroanilato Bridges

et al. 2016

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Abstract:The first complexes with lanthanoid ions and the nitroanilato ligand have been synthesized (nitroanilate dianion = [C 6 O 4 (NO 2 ) 2 ] 2− = dianion of the 3,6-dinitro-2,5-dihydroxo-1,4-dibenzoquinone ligand). This family of dimers can be formulated as [Ln 2 (C 6 O 4 (NO 2 ) 2 ) 3 (H 2 O) 10 ]·6H 2 O with Ln(III) = Sm (1), Gd (2), Tb (3), Dy (4), Ho (5), and Er (6). The X-ray structure of this family of isostructural complexes shows that they all present a dimeric structure where the Ln 3+ ions are connected by a bis-bidentate nitroanilato ligand. Each metal completes its nonacoordination environment with a terminal bidentate nitroanilato ligand and five water molecules in a slightly distorted tri-capped trigonal prismatic geometry. The magnetic properties of this family show the expected contributions of the lanthanoid ions without any noticeable magnetic interaction through the nitroanilato ligand. The compounds present luminesce of the nitroanilato ligand superimposed with a weaker emission from the lanthanide ion in compound 5 (Ho).

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Section: Introductionmentioning

confidence: 99%

A Family of Lanthanoid Dimers with Nitroanilato Bridges

et al. 2016

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“…The results were promising, teaching how to develop strategies to design and synthesize ferro-or ferri-magnetic coupled molecules. The result was the production of low dimensional magnets while 3D materials were more difficult and the number of molecular magnets working at room temperature did not exceed 2 [1][2][3][4]. The critical temperatures of pure organic ferromagnets are still in the 30 K range.…”

Section: A Nano History Of Molecular Magnetismmentioning

confidence: 99%

Lanthanides in the frame of Molecular Magnetism

Gatteschi

2014

EPJ Web of Conferences

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Abstract. Molecular magnetism is producing new types of materials which cover up to date aspects of basic science together with possible applications. This article highlights recent results from the point of view of lanthanides which are now intensively used to produce single molecule magnets, single chain and single ion magnets. After a short introduction reminding the main steps of development of molecular magnetism, the basic properties of lanthanides will be covered highlighting important features which are enhanced by the electronic structure of lanthanides, like spin frustration and chirality, anisotropy and non collinear axes in zero and one dimensional materials. A paragraph of conclusions will discuss what has been done and theperspectives to be expected. A Nano history of molecular magnetismMolecular magnetism is a relatively recent section of magnetism which evolved from magnetochemistry. Magnetochemistry is the use of magnetic measurements in order to obtain structural information. An example should explain. Nickel(II) has a configuration 3d 8 . A compound with four ligands can have either a tetrahedral or square planar coordination geometry. A ligand field description shows that the five degenerate d orbitals in cubic symmetry remove their degeneracy due to low symmetry effects. The tetrahedral field is weaker than the square planar and the latter forces the electron spins to pair, while the weak tetrahedral keeps two electrons unpaired. A simple magnetic measurement at room temperature decides about the coordination structure. In fact the tetrahedral nickel (II) complexes are paramagnetic and square planar are diamagnetic. A useful technique but nothing more.The change occurred from the 60s of last century when it was realized that molecular chemistry could yield new types of magnetic materials, following the same type of evolution which took place on conductors where the introduction of molecular techniques determined a technological breakthrough.The goal at the beginning was to design and synthesize high T organic ferromagnets, but the challenge appeared soon to be too difficult and in order to start from a less hard field the goal was broadened rapidly to molecular ferromagnets i.e. to materials which may contain metal ions together with organic molecules. The results were promising, teaching how to develop strategies to design and synthesize ferro-or ferri-magnetic coupled molecules. The result was the production of low dimensional magnets while 3D materials were more difficult and the number of molecular magnets working at room temperature did not exceed 2 [1-4]. The critical temperatures of pure organic ferromagnets are still in the 30 K range.Luckily in those years there was a keen interest among physicists towards low D magnets and the exotic molecular magnets attracted the interest of quite a few. The problem was the different languages of the two communities. Physicists for instance needed one-dimensional antiferro-magnets with S> ½ to test the Haldane theory, and the only systems they we...

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“…Thus, the combination of this ligand with different transition metals yielded two closely-related series of CP, formulated as [M(1kN:2kO-tcnopr3OH) 2 [22,28]. Interestingly, three metal ions (Fe, Co and Ni) gave rise to both linkage isomers and constitute the first series of CP presenting linkage isomerism [28].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, Fe(II) forms a centro-symmetric monomer formulated as [Fe II Among the polynitrile ligands used to prepare coordination polymers (Scheme 1), the most versatile one has been tcnopr3OH´(1,1,3,3-tetracyano-2-(3-hydroxypropoxy)-propenide), thanks to the presence of a longer and, therefore, more flexible alkyl chain. Thus, the combination of this ligand with different transition metals yielded two closely-related series of CP, formulated as [M(1kN:2kO-tcnopr3OH) 2 [22,28]. Interestingly, three metal ions (Fe, Co and Ni) gave rise to both linkage isomers and constitute the first series of CP presenting linkage isomerism [28].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, although many CP have been synthesized with different magnetic [1][2][3], electrical [4] and/or optical properties [5,6], the design and preparation of novel CP with tailored properties remains a challenge. The most used strategies to reach this goal are: (i) the use of simple bridging ligands, such as azide (N 3´) [7][8][9][10][11], cyanide (CN´) [12] dicyanamide (N(CN) 2´) [13][14][15], oxalato (C 2 O 4 2´) , .…”

Section: Introductionmentioning

confidence: 99%

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