A homospin cobalt(ii) topological ferrimagnet

Zou, Ji-Yong; Shi, Wei; Xu, Na; Li, Leilei; Tang, Jinkui; Gao, Hong-Ling; Cui, Jian-Zhong

doi:10.1039/c3cc43642j

Cited by 41 publications

(16 citation statements)

References 43 publications

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“…After further cooling, their χ M T values drop sharply to 26,34 As for the peak values of χ M T around 2.5 K for 1 and 3.4 K for 3, it maybe indicates the occurrence of weak ferromagnetism in their systems. 44,49 Upon cooling for 4, the χ M T value decreases monotonically, while the χ M value reaches a maximum value around 12 K with an increase below 4 K (Figure 10). given in the whole temperature range.…”

Section: ■ Results and Discussionmentioning

confidence: 98%

Coordination Frameworks Containing Magnetic Single Chain of Imidazoledicarboxylate-Bridged Cobalt(II)/Nickel(II): Syntheses, Structures, and Magnetic Properties

Wang

Liu

et al. 2018

Crystal Growth & Design

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Five new magnetic coordination frameworks with formulas of {[Co2(HL)2(H2O)4]·4H2O} n (1), {[Ni2(HL)2(H2O)4]·4H2O} n (2), [Co(HL)(bpy)] n (3), [Co(HL)(pbim)] n (4), and [Ni(HL)(pbim)] n (5) [H3L = 2-(5-bromo-pyridin-3-yl)-1H-imidazole-4,5-dicarboxylic acid, bpy = 4,4′-bipyridine, and pbim = 1,1′-(5-methyl-1,3-phenylene)bis(1H-imidazole)] have been synthesized and structurally characterized by elemental, thermogravimetric, and X-ray diffraction analyses. In all compounds, the doubly deprotonated (HL)2– ligands adopt the same μ-kN,O:kN′,O′ coordination mode, showing very interesting coordination orientation in the construction of those coordination polymers. Complexes 1 and 2 feature (HL)2–-bridged linear chain structures. Complex 3 is a 2D network with (4,4) grids built up from the (HL)2–-bridged linear chains observed in 1 being further linked by rod-like bpy bridges replacing the coordination of water molecules. Those almost or completely linear chains formed by the bis-N,O-chelation of the imidazoledicarboxylate of (HL)2– in 1–3 are rarely observed in the complexes of 4,5-imidazoledicarboxylic acid and its derivatives, giving a typical structure model to investigate the magnetic exchange-coupling mediated by imidazoledicarboxylate. Isostructural complexes 4 and 5 are 2D helicates where (HL)2–-bridged left- and right-handed helixes are doubly linked into the mesolayer structures with 63 topology through the further coordination of angular spacers pbim. Remarkably, the formation of (HL)2–-bridged linear chains or helical chains is mainly dependent on the trans- or cis-chelation of two (HL)2– ligands around the same metal center, which could be finely tuned by the structural features of auxiliary ligands used. Magnetostructural analyses disclose that the bis-N,O-chelating imidazoledicarboxylates of (HL)2– transmit antiferromagnetic interactions along the (HL)2–-bridged metal–organic chains with the spin-coupling constants of −4.89, −17.8,–6.55, −7.35, and −19.6 cm–1 for 1–5, respectively. Notably, the μ-kN,O:kN′,O′ coordination mode of (HL)2– ligand dominates the assembly of metal–organic frameworks as well as the magnetic exchange between the paramagnetic ions in those magnetic chains, but the magnetic exchange-coupling depends strongly on the nature of the metal center.

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Section: ■ Results and Discussionmentioning

confidence: 98%

Coordination Frameworks Containing Magnetic Single Chain of Imidazoledicarboxylate-Bridged Cobalt(II)/Nickel(II): Syntheses, Structures, and Magnetic Properties

Wang

Liu

et al. 2018

Crystal Growth & Design

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“…The large negative value for θ in the cobalt compound shows that there is some magnetic frustration, but the missing bridge effectively breaks the magnetic coupling between the two chains with parallel moments and allows all of the nearest-neighbor chains to couple antiferromagnetically. This “satisfied” triangular lattice is the basis for both the ferrimagnetic behavior and the metamagnetic transitions; with a two-up/one-down arrangement of the chains, even a material that contains only one type of metal center in a single oxidation and spin state can act as a homospin topological ferrimagnet . Although only one-third of the total magnetic moment is apparent in the ordered state, the metamagnetic transition at high field flips the direction of the third chain, leading to a three-up ferromagnetic arrangement that triples the net magnetization.…”

Section: Results and Discussionmentioning

confidence: 99%

“…This "satisfied" triangular lattice is the basis for both the ferrimagnetic behavior and the metamagnetic transitions; with a two-up/one-down arrangement of the chains, even a material that contains only one type of metal center in a single oxidation and spin state can act as a homospin topological ferrimagnet. 40 Although only one-third of the total magnetic moment is apparent in the ordered state, the metamagnetic transition at high field flips the direction of the third chain, leading to a three-up ferromagnetic arrangement that triples the net magnetization.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

A Series of Chiral, Polar, Homospin Topological Ferrimagnets: M₃(OOCH)₅Cl(OH₂) (M = Fe, Co, Ni)

et al. 2017

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An isostructural series of transition metalformate-chloride-hydrate compounds, M 3 (OOCH) 5 Cl(OH 2 ) (M = Fe, Co, Ni), have been synthesized using a solvothermal method. These compounds crystallize in the chiral and polar space group P3 1 and are comprised of three different types of helical chains of edge-sharing M 2+ -centered octahedra. All three compounds undergo 3D ferrimagnetic ordering at low temperature, and the iron and cobalt analogues exhibit fieldinduced metamagnetic transitions. The magnetic structure was determined by neutron powder diffraction, revealing ferromagnetic intrachain coupling and antiferromagnetic interchain interactions, with the three chains arranged in a two-up/onedown triangular lattice. As all three chains contain one type of metal in the same spin state, these compounds are rare examples of homospin topological ferrimagnets.

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“…28−34 So the combination of both carboxylate-triazole groups and metal clusters into MOFs may result in diversiform structures and interesting properties. 35,36 Recently, we have successfully constructed a cage-based cationic MOF by using a bifunctional linker, 4-(4-carboxyphenyl)-1,2,4-triazole (HCPT), and a [Cu 4 Cl] 7+ cluster as the node. 37 As a continuation of our work, another bifunctional organic linker, 4-(1,2,4-triazol-4-yl)phenylacetic acid (HTPA), was designed and synthesized (Scheme 1).…”

Section: ■ Introductionmentioning

confidence: 99%

Switching a 2D Co(II) Layer to a 3D Co₇-Cluster-Based Metal–Organic Framework: Syntheses, Crystal Structures, and Magnetic Properties

Chen

Zhang

et al. 2015

Inorg. Chem.

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Two 2D layered coordination networks with formulas of {[Co(TPA)Cl](H2O)2.5}n (1) and {[Co(TPA)(μ2-OH)](H2O)2}n (2) (HTPA = 4-(1,2,4-triazol-4-yl)phenylacetic acid) were solvothermally synthesized and fully characterized. Interesting 1D Co(2+)-Cl or Co(2+)-μ2-OH chain structures were observed. By carefully adjusting the reaction conditions, a new 3D metal-organic framework (MOF) with a formula of {[Co7(TPA)6(μ3-OH)4(μ2-OH)2(H2O)4](TPA)2(DMF)3(H2O)3}n (3) was obtained. MOF 3 is built from Co7 clusters and fully deprotonated TPA ligands, which display a cubic pcu topology. Factors that influence the structures of the three TPA-based complexes, as well as their magnetic properties, were investigated in detail. The heptanuclear-Co(II)-cluster-based MOF 3 shows interesting magnetization dynamics at low temperature.

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A homospin cobalt(ii) topological ferrimagnet

Abstract: An unusual 3D homospin cobalt(II) molecular topological ferrimagnet has been successfully assembled using a mixed ligand approach, which shows a critical temperature of 9 K and a compensation temperature of 5 K.

Cited by 41 publications

References 43 publications

Coordination Frameworks Containing Magnetic Single Chain of Imidazoledicarboxylate-Bridged Cobalt(II)/Nickel(II): Syntheses, Structures, and Magnetic Properties

Coordination Frameworks Containing Magnetic Single Chain of Imidazoledicarboxylate-Bridged Cobalt(II)/Nickel(II): Syntheses, Structures, and Magnetic Properties

A Series of Chiral, Polar, Homospin Topological Ferrimagnets: M₃(OOCH)₅Cl(OH₂) (M = Fe, Co, Ni)

Switching a 2D Co(II) Layer to a 3D Co₇-Cluster-Based Metal–Organic Framework: Syntheses, Crystal Structures, and Magnetic Properties

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A homospin cobalt(ii) topological ferrimagnet

Abstract: An unusual 3D homospin cobalt(II) molecular topological ferrimagnet has been successfully assembled using a mixed ligand approach, which shows a critical temperature of 9 K and a compensation temperature of 5 K.

Cited by 41 publications

References 43 publications

Coordination Frameworks Containing Magnetic Single Chain of Imidazoledicarboxylate-Bridged Cobalt(II)/Nickel(II): Syntheses, Structures, and Magnetic Properties

Coordination Frameworks Containing Magnetic Single Chain of Imidazoledicarboxylate-Bridged Cobalt(II)/Nickel(II): Syntheses, Structures, and Magnetic Properties

A Series of Chiral, Polar, Homospin Topological Ferrimagnets: M3(OOCH)5Cl(OH2) (M = Fe, Co, Ni)

Switching a 2D Co(II) Layer to a 3D Co7-Cluster-Based Metal–Organic Framework: Syntheses, Crystal Structures, and Magnetic Properties

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A Series of Chiral, Polar, Homospin Topological Ferrimagnets: M₃(OOCH)₅Cl(OH₂) (M = Fe, Co, Ni)

Switching a 2D Co(II) Layer to a 3D Co₇-Cluster-Based Metal–Organic Framework: Syntheses, Crystal Structures, and Magnetic Properties