Magnetostructural behaviour of the complex [MnL(H2O)2]Cl2·4H2O at variable temperature studied by electron spin resonance (L = 2,13-dimethyl-3,6,9,12,18-pentaazabicyclo[12.3.1]octadeca-1(18),2,12,14,16-pentaene)

Jiménez‐Sandoval, O.; Ramı́rez-Rosales, Daniel; Rosales-Hoz, María del Jesús; Sosa‐Torres, Martha E.; Zamorano, R.

doi:10.1039/a801292j

Cited by 49 publications

(35 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The assumption about the change in the D parameter, which shows a certain change in the distortion of the nearest environment of Mn 2ϩ , agrees with the EPR spectroscopic data of [Mn(MAC)(H 2 O) 2 ]Cl 2 ·4H 2 O. [12] The increase of the linewidth in the Q-band, however, can be described only by a decrease in the J parameter. The EPR spectroscopic data therefore enable us to suppose that the exchange interaction decreases weakly as the temperature is decreased.…”

supporting

confidence: 55%

“…[12] In the absence of the exchange interaction, the form of the spectrum of a polycrystalline Mn 2ϩ sample in the X-band would be asymmetric. In the Q-band the form of the spectrum changes because the ratio between the fine structure parameter and the Zeeman energy changes.…”

mentioning

confidence: 99%

“…We recall that for the parent compound, . [12] The alternative way of rationalizing the magnetic behaviour is to consider only the exchange interactions of the manganese() ions within the supramolecular chain. The exchange pathway is provided by the diamagnetic (TCNQ) 2 2Ϫ dimers.…”

mentioning

confidence: 99%

“…

…”

mentioning

confidence: 99%

See 3 more Smart Citations

Exchange Interactions at the Supramolecular Level − Synthesis, Crystal Structure, Magnetic Properties, and EPR Spectra of [Mn(MAC)(TCNQ)₂] (MAC = Pentaaza Macrocyclic Ligand; TCNQ·⁻ = Radical Anion of 7,7,8,8‐Tetracyano‐p‐quinodimethane)

et al. 2003

View full text Add to dashboard Cite

Keywords: Manganese / N ligands / Stacking interactions / Magnetic properties / EPR spectroscopy / RadicalsThe reaction between [Mn(MAC)(H 2 O) 2 ]Cl 2 ·4H 2 O and LiTCNQ (MAC = 2,6,9,12,.1]octadeca-1(18),2,12,14,16-pentaene) affords a complex with the formula [Mn(MAC)(TCNQ) 2 ] (1), whose crystal structure has been determined. Its structure consists of neutral mononuclear entities. The manganese(II) ion is heptacoordinated, with a pentagonal bipyramidal geometry. The apical positions are occupied by the TCNQ· − radicals, while the macrocyclic ligand is coordinated at the equatorial positions. The seven Mn−N distances range from 2.273(3) to 2.301(6) Å . The strong intermolecular π−π stacking interactions between the TCNQ radicals (3.2 Å ) leads to weave-like

show abstract

supporting

confidence: 55%

mentioning

confidence: 99%

mentioning

confidence: 99%

“…

…”

mentioning

confidence: 99%

See 2 more Smart Citations

Exchange Interactions at the Supramolecular Level − Synthesis, Crystal Structure, Magnetic Properties, and EPR Spectra of [Mn(MAC)(TCNQ)₂] (MAC = Pentaaza Macrocyclic Ligand; TCNQ·⁻ = Radical Anion of 7,7,8,8‐Tetracyano‐p‐quinodimethane)

et al. 2003

View full text Add to dashboard Cite

show abstract

“…High-spin d 5 ions with this geometry are expected to exhibit negligible magnetic anisotropy. Sosa-Torres et al investigated the magnetic anisotropy of a high-spin Mn II ion in a hepta-coordinated PBP geometric complex [Mn II (L N5 )(H 2 O) 2 ]Cl 2 (109, where L N5 is a pentadentate macrocyclic ligand that provides an N 5 coordinating environment) [219]. Theoretical analysis, magnetic investigations, and EPR spectroscopic studies unambiguously demonstrated that the magnetic anisotropy parameters for the Mn II ion in this complex were D = 0.07 cm -1 , E = 0.008 cm -1 , and g = 2.11 [219].…”

Section: Hepta-coordinated Complexesmentioning

confidence: 99%

Magnetic anisotropy in two- to eight-coordinated transition–metal complexes: Recent developments in molecular magnetism

Bar

Pichon

Sutter

2016

Coordination Chemistry Reviews

385

249

View full text Add to dashboard Cite

A Docosanuclear {Mo₈Mn₁₄} Cluster Based on [Mo(CN)₇]⁴⁻

2010

View full text Add to dashboard Cite

One of the recent strategies being explored for obtaining molecular magnets with enhanced properties is the incorporation of heavier transition metals from the 4d and 5d metal ions. [1][2][3] A central player in this area of research is the cyanide ligand, which can be used to prepare mixed metal clusters with unusual properties. [4] Of particular interest is the fact that cyanide molecules containing 4d or 5d ions or combinations of them with 3d ions have been predicted to behave as singlemolecule magnets (SMMs) with higher blocking temperatures T B than those based on 3d ions. They are also expected to exhibit properties such as anisotropic magnetic exchange interactions. [5] A main driving force for the high activity in cyanide magnetism is that the use of cyanometalates in reactions with metal ions equipped with capping ligands present several advantages, such as control over the sign of magnetic interactions in most cases and also predictable structures based on the building block approach. Magnetic anisotropy can be conveniently introduced by choosing the appropriate preformed 4d or 5d cyanometalate anion. The observation of SMM behavior with 4d and 5d metal ions with oxygen-type bridging ligands is limited to only one case, [6] but there are a number of SMMs from the heavier congeners of Groups 6 and 7 with the precursors [(Me 3 tacn)Mo III (CN) 3 ], [7] [Mo V (CN) 8 ] 3À , [8,9] [W V (CN) 8 ] 3À , [8][9][10] [Re IV (CN) 7 ] 3À , [11] and [(triphos)Re II (CN) 3 ] À . [12] In contrast to the widely investigated anion [Mo V (CN) 8 ] 3À , [2,8,9] the heptacyanomolybdate derivative [Mo III (CN) 7 ] 4À has received much less attention in the molecular magnetism field, presumably because of the synthetic challenges in the preparation and handling of this anion. Unlike the hexa-and octacyanometalates, the [Mo III (CN) 7 ] 4À anion favors low-symmetry extended structures with pronounced magnetic anisotropy. [1,13] The results of theoretical investigations have suggested that [Mo(CN) 7 ] 4À will be useful for the design of SMMs with high T B values as a result of its strong anisotropic exchange properties. [5] Despite such promising predictions, magnetic materials based on [Mo(CN) 7 ] 4À are relatively scarce, with the exception of the pioneering work of Kahn and co-workers, and subsequent studies by several other research groups, who prepared a number of two-and three-dimensional magnets with the [Mo(CN) 7 ] 4À and Mn II ions. [1,13] The only other reports are an amorphous compound with iron(II) [14] and two microcrystalline materials with vanadium(II) and nickel(II). [15] To our knowledge, no discrete clusters based on [Mo(CN) 7 ] 4À have been reported.Given the aforementioned considerations, we recently devoted efforts to the preparation of mixed-metal molecules that contain the [Mo(CN) 7 ] 4À building block. Herein, we report the first discrete compound based on [Mo(CN) 7 ] 4À

show abstract

Magnetostructural behaviour of the complex [MnL(H2O)2]Cl2·4H2O at variable temperature studied by electron spin resonance (L = 2,13-dimethyl-3,6,9,12,18-pentaazabicyclo[12.3.1]octadeca-1(18),2,12,14,16-pentaene)

Cited by 49 publications

References 19 publications

Exchange Interactions at the Supramolecular Level − Synthesis, Crystal Structure, Magnetic Properties, and EPR Spectra of [Mn(MAC)(TCNQ)₂] (MAC = Pentaaza Macrocyclic Ligand; TCNQ·⁻ = Radical Anion of 7,7,8,8‐Tetracyano‐p‐quinodimethane)

Exchange Interactions at the Supramolecular Level − Synthesis, Crystal Structure, Magnetic Properties, and EPR Spectra of [Mn(MAC)(TCNQ)₂] (MAC = Pentaaza Macrocyclic Ligand; TCNQ·⁻ = Radical Anion of 7,7,8,8‐Tetracyano‐p‐quinodimethane)

Magnetic anisotropy in two- to eight-coordinated transition–metal complexes: Recent developments in molecular magnetism

A Docosanuclear {Mo₈Mn₁₄} Cluster Based on [Mo(CN)₇]⁴⁻

Contact Info

Product

Resources

About

Magnetostructural behaviour of the complex [MnL(H2O)2]Cl2·4H2O at variable temperature studied by electron spin resonance (L = 2,13-dimethyl-3,6,9,12,18-pentaazabicyclo[12.3.1]octadeca-1(18),2,12,14,16-pentaene)

Cited by 49 publications

References 19 publications

Exchange Interactions at the Supramolecular Level − Synthesis, Crystal Structure, Magnetic Properties, and EPR Spectra of [Mn(MAC)(TCNQ)2] (MAC = Pentaaza Macrocyclic Ligand; TCNQ·− = Radical Anion of 7,7,8,8‐Tetracyano‐p‐quinodimethane)

Exchange Interactions at the Supramolecular Level − Synthesis, Crystal Structure, Magnetic Properties, and EPR Spectra of [Mn(MAC)(TCNQ)2] (MAC = Pentaaza Macrocyclic Ligand; TCNQ·− = Radical Anion of 7,7,8,8‐Tetracyano‐p‐quinodimethane)

Magnetic anisotropy in two- to eight-coordinated transition–metal complexes: Recent developments in molecular magnetism

A Docosanuclear {Mo8Mn14} Cluster Based on [Mo(CN)7]4−

Contact Info

Product

Resources

About

Exchange Interactions at the Supramolecular Level − Synthesis, Crystal Structure, Magnetic Properties, and EPR Spectra of [Mn(MAC)(TCNQ)₂] (MAC = Pentaaza Macrocyclic Ligand; TCNQ·⁻ = Radical Anion of 7,7,8,8‐Tetracyano‐p‐quinodimethane)

Exchange Interactions at the Supramolecular Level − Synthesis, Crystal Structure, Magnetic Properties, and EPR Spectra of [Mn(MAC)(TCNQ)₂] (MAC = Pentaaza Macrocyclic Ligand; TCNQ·⁻ = Radical Anion of 7,7,8,8‐Tetracyano‐p‐quinodimethane)

A Docosanuclear {Mo₈Mn₁₄} Cluster Based on [Mo(CN)₇]⁴⁻