Isotropic magnetic exchange in magnesium dichloride dihydrate, MnCl2.2H2O, a chemical linear chain

McElearney, J. N.; Merchant, S.; Carlin, Richard L.

doi:10.1021/ic50122a040

Cited by 75 publications

(21 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The net effect is weaker phosphinatemanganese bonds, poorer orbital overlap and weaker intrachain exchange. Another possible source of the effective damping of significant net magnetic exchange in the hydrate is suggested by the work on MnC12-2H20 (39). This compound exhibits some structural similarities to the hydrate studied here.…”

Section: Resultsmentioning

confidence: 63%

Magnetic properties of anhydrous and hydrated dimethylphosphinates of manganese(II). The crystal and molecular structure of poly-bis(μ-dimethylphosphinato)diaquomanganese(II)

Cicha¹,

Haynes²,

Oliver³

et al. 1985

Can. J. Chem.

View full text Add to dashboard Cite

Can. J. Chem. 63, 1055 (1985. The dimethylphosphinate of manganese(ll), Mn[(CH3)zP02]2, and its dihydrate have been prepared and studied using magnetic susceptibility, differential scanning calorimetry, and electronic and vibrational spectroscopic methods. The dihydrate was obtained in crystalline form and a single crystal X-ray diffraction study revealed a polymeric structure.Crystals of~poly-bis(p-dimethylphosphinato)diaquomanganese(l1) are monoclinic, o = 20.722(3), b = 4.8652(2), c = 11.0689(14) A, P = 102.209(7)", Z = 4, space group C2/c. The structure was solved by conventional heavy-atom methods and was refined by full-matrix least-squares procedures to R = 0.030 and R,,. = 0.033 for 983 reflections with I 2 3u(I). The structure consists of infinite centrosymmetric chains of Mn(ll) atoms linked by double phosphinate bridges and extending along the crystallographic b axis. The water molecu!es are involved in both interchain and bifurcated intrachain hydrogen bonding (0.--0 = 2.734(2), 2.899(3) and 3.120(3) A). The coordination about Mn is slightly distorteG octahedral with librationcorrected bond lengths Mn-O(phosphinato) = 2.156(2) and 2.212(2), Mn-OH2 = 2.247(2) A. Magnetic susceptibility studies on the dihydrate from 300 to 4.2 K reveal a magnetic moment of -5.9 BM over most of the range and give no evidence for significant magnetic exchange. The anhydrous compound, which is considered on the basis of indirect evidence to retain the double phosphinate bridged structure exhibited by the dihydrate, shows relatively strong antiferromagnetic behaviour. The data have been analyzed according to two theoretical models both of which employ the isotropic Heinsenberg Hamiltonian. The scaling model of Wagner and Friedberg gives J = -2.94 cm-' and g = 2.02 and the interpolation scheme of Weng gives J = -2.69 cm-' and g = 2.01. The magnitude of the exchange coupling is considered in relation to that observed in related manganese compounds and possible reasons for the observed damping of the exchange on hydration are discussed. Les etudes de susceptibiliti magnttique, rCalisCes avec I'hydrate double ii des temperatures allant de 300 a 4,2 K, rtvklent la presence d'un moment magnttique de 5.9 BM environ sur presque tout I'intervalle considtrk. Le compose anhydre, qui, d'aprts des preuves indirectes, conserverait la structure pontCe double phosphinate qui existe dans le dihydrate, exhibe un comportement antiferromagnktique relativement fort. On a analysC les donntes selon deux modtles thkoriques qui utilisent I'Hamiltonien isotrope de Heinsenberg. Le modble proportionnt de Wagner et Friedberg permet de prtdire des valeurs de J = -2,94 cm-' et g = 2,02 alors que le schema d'interpolation de Weng conduit a des valeurs de J = -2,69 cm-' et g = 2,01. On considkre I'amplitude du couplage d'echange en rapport avec celui observe avec des composes apparentes du mangankse et on discute des raisons qui pourraient expliquer le fait que I'tchange accompagnant I'hydratation est amoindri.[Traduit par le journal] Introduction The po...

show abstract

Section: Resultsmentioning

confidence: 63%

Magnetic properties of anhydrous and hydrated dimethylphosphinates of manganese(II). The crystal and molecular structure of poly-bis(μ-dimethylphosphinato)diaquomanganese(II)

Cicha¹,

Haynes²,

Oliver³

et al. 1985

Can. J. Chem.

View full text Add to dashboard Cite

show abstract

“…The Mn 2 Cl 2 rhombic-core observed in MnCl 2 (urea) 2 is common to several other Mn(II)-chloride chain compounds, including MnCl 2 · 2H 2 O, 3 MnCl 2 (mppma) [mppma = N -(3-methoxypropyl)- N -(pyridine-2-ylmethyl)amine], 19 MnCl 2 (pz) 2 (pz = pyrazole) 20 and MnCl 2 (2,2′-bipy) (bipy = bipyridine). 9 The corresponding Mn⋯Mn distance/Mn-Cl-Mn bond angle in the dihydrate, mppma and bipy complexes are 3.691 Å/92.55°, 3.790 Å (average)/94.14° and 3.835 Å/96.4°.…”

Section: Resultsmentioning

confidence: 88%

“…For example, anhydrous CuCl 2 has been shown to exhibit spin-driven ferroelectricity and strong magnetoelectric coupling 2a whereas CuBr 2 is a multiferroic with a relatively high T N of 73.5 K. 2b Hydrates such as MnCl 2 · 2H 2 O 3 , as well as alkali metal salts such as Rb 2 MnCl 4 4a and CsNiCl 3 4b , also exist, the latter two compounds being described respectively as a 2D Heisenberg square lattice and a 1D Haldane spin-chain.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Structure and Exchange Interactions in Quasi-One-Dimensional MnCl₂(urea)₂

et al. 2015

View full text Add to dashboard Cite

MnCl2(urea)2 is a new linear chain coordination polymer that exhibits slightly counter-rotated MnCl4 rhomboids along the chain-axis. The material crystallizes in the non-centrosymmetric orthorhombic space group Iba2, with each Mn(II) ion equatorially surrounded by four Cl− that lead to bi-bridged ribbons. Urea ligands coordinate via O-atoms in the axial positions. Hydrogen bonds of the Cl⋯H-N and O⋯H-N type link the chains into a quasi-3D network. Magnetic susceptibility data reveal a broad maximum at 9 K that is consistent with short-range magnetic order. Pulsed-field magnetization measurements conducted at 0.6 K show that a fully polarized magnetic state is achieved at Bsat = 19.6 T with a field-induced phase transition occurring at 2.8 T. Neutron diffraction studies made on a powdered sample of MnCl2(urea)2 reveal that long-range magnetic order occurs below TN = 3.2(1) K. Additional Bragg peaks due to antiferromagnetic (AFM) ordering can be indexed according to the Ib’a2’ magnetic space group and propagation vector τ = [0, 0, 0]. Rietveld profile analysis of these data reveal a Néel-type collinear ordering of Mn(II) ions with an ordered magnetic moment of 4.06(6) μB (5 μB is expected for isotropic S = 5/2) oriented along the b-axis, i.e., perpendicular to the chain-axis that runs along the c-direction. Owing to potential for spatial exchange anisotropy and the pitfalls in modeling bulk magnetic data, we analyzed inelastic neutron scattering data to retrieve the exchange constants; Jc = 2.22 K (intrachain), Ja = −0.10 K (interchain) and D = −0.14 K with J > 0 assigned to AFM coupling. This J configuration is most unusual and contrasts the more commonly observed case of AFM-coupled FM-chains.

show abstract

“…[7] The magnetic susceptibility of 1 has been fitted to the Fisher model [12] of the isotropic Heisenberg antiferromagnet, and later modified by Wagner and Friedberg [13] for a Mn 2C system of spin 5/2. [14] Unfortunately, we could not get satisfactory result. Obviously, the magnetic pathways between neighbor Mn(II) ions of 1 are complicated, which could not be simply dealt with.…”

Section: Magnetic Propertiesmentioning

confidence: 91%

A New 3D Mn(II) Coordination Polymer Built by 2-(m-Methylphenyl)-Imidazole Dicarboxylate Ligand

Jia

Luo

et al. 2015

Synthesis and Reactivity in Inorganic, Metal-Organic, and Nano-

View full text Add to dashboard Cite

A novel coordination polymer, {[Mn 3 (m 3 -m-MePhIDC) 2 (H 2 O) 6 ]¢3H 2 O} n (1), has been synthesized by hydrothermal reaction, employing 2-(m-methylphenyl)-1H-imidazole-4,5-dicarboxylic acid (m-MePhH 3 IDC) as organic ligand, and characterized by singlecrystal X-ray diffraction, elemental analysis, PXRD, and IR spectra. It crystallizes in trigonal R 3 space group and exhibits a 3D honeycomb-like framework constructed from Mn(II) ions and m-MePhIDC 3-units. The thermal and magnetic properties of compound 1 have been investigated as well.

show abstract

Isotropic magnetic exchange in magnesium dichloride dihydrate, MnCl2.2H2O, a chemical linear chain

Cited by 75 publications

References 0 publications

Magnetic properties of anhydrous and hydrated dimethylphosphinates of manganese(II). The crystal and molecular structure of poly-bis(μ-dimethylphosphinato)diaquomanganese(II)

Magnetic properties of anhydrous and hydrated dimethylphosphinates of manganese(II). The crystal and molecular structure of poly-bis(μ-dimethylphosphinato)diaquomanganese(II)

Magnetic Structure and Exchange Interactions in Quasi-One-Dimensional MnCl₂(urea)₂

A New 3D Mn(II) Coordination Polymer Built by 2-(m-Methylphenyl)-Imidazole Dicarboxylate Ligand

Contact Info

Product

Resources

About

Isotropic magnetic exchange in magnesium dichloride dihydrate, MnCl2.2H2O, a chemical linear chain

Cited by 75 publications

References 0 publications

Magnetic properties of anhydrous and hydrated dimethylphosphinates of manganese(II). The crystal and molecular structure of poly-bis(μ-dimethylphosphinato)diaquomanganese(II)

Magnetic properties of anhydrous and hydrated dimethylphosphinates of manganese(II). The crystal and molecular structure of poly-bis(μ-dimethylphosphinato)diaquomanganese(II)

Magnetic Structure and Exchange Interactions in Quasi-One-Dimensional MnCl2(urea)2

A New 3D Mn(II) Coordination Polymer Built by 2-(m-Methylphenyl)-Imidazole Dicarboxylate Ligand

Contact Info

Product

Resources

About

Magnetic Structure and Exchange Interactions in Quasi-One-Dimensional MnCl₂(urea)₂