Couplage de spins dans une molécule contenant trois ions chromiques. Propriétés magnétiques entre 1,6°K et 293°K de l'acétate complexe [Cr 3 (CH 3 COO) 6 (OH) 2 ]Cl.8H 2 O

Wucher, J.; Gijsman, H.M.

doi:10.1016/s0031-8914(54)80050-4

Cited by 47 publications

(5 citation statements)

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“…The presence of spin frustration has been sought at the molecular level in trimers of copper, ,,− iron − and chromium. − However, magnetism characteristic of spin frustration is not typically obtained. Geometric distortion of the antiferromagnetic ground-state eradicates spin frustration by allowing a 2 (antiferromagnetic) + 1 (unpaired) spin system to be achieved. , Even when the triangles exhibit perfect 3-fold symmetry at room temperature, as is the case for the Fe 3 cluster mineral α-metavoltine, and molecular triangles of iron 23,58-61 and copper, ,, low symmetry distortions prevail at low temperature and spin frustration is alleviated.…”

Section: Discussionmentioning

confidence: 99%

Long-Range Magnetic Ordering in Iron Jarosites Prepared by Redox-Based Hydrothermal Methods

Bartlett

Nocera

2005

J. Am. Chem. Soc.

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The iron jarosites, plumbojarosite, Pb0.5Fe3(OH)6(SO4)2, argentojarosite, AgFe3(OH)6(SO4)2, and thallium jarosite, TlFe3(OH)6(SO4)2, along with the selenate-capped jarosite analogues of potassium, KFe3(OH)6(SeO4)2, and rubidium, RbFe3(OH)6(SeO4)2, have been prepared in their analytically pure forms by employing redox-based hydrothermal methods. The crystal structures of these materials have been determined, and all are found to be essentially isostructrual including Pb0.5Fe3(OH)6(SO4)2, which is distinct from the structure reported for naturally mined samples. All iron jarosites show long-range order (LRO), signified by a sharp transition temperature, T(N), which falls in the narrow temperature range of 61.4 +/- 5 K. The mechanism responsible for this ordering has been established by examining magnetostructural correlations for the jarosites possessing various interlayer cation and capping groups. We show that all magnetic properties of jarosites, including LRO, find their origin in the basic magnetic unit, the intralayer Fe3(mu-OH)3 triangle. Field-dependent magnetization experiments are consistent with the antiferromagnetic stacking of an out of plane moment developed from spin canting within Fe3(mu-OH)3 triangles. Together with the previously reported AFe3(OH)6(SO4)2 (A = Na+, K+, Rb+ and NH4+) jarosites, these compounds provide a framework for probing magnetic ordering in a spin frustrated lattice of the largest series of isoelectronic and isostructural kagomé systems yet discovered.

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Section: Discussionmentioning

confidence: 99%

Long-Range Magnetic Ordering in Iron Jarosites Prepared by Redox-Based Hydrothermal Methods

Bartlett

Nocera

2005

J. Am. Chem. Soc.

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“…[25] Thew ork was carried out independently of Kambe,b ut these authors also refrained from applying the isosceles modelo nt heir available data. Subsequently,W ucher reported magnetic susceptibility [26] and heat capacity [27] data of [Cr 3 O(O 2 CMe) 6 (H 2 O) 3 ]Cl.T he magnetic data were not very revealingo ft he magnetic symmetry,s omething to be later confirmeda saf eature of chromium(III) triangles. [28,29] However, heat capacity data revealed al ow-temperature Shottky anomaly,w hich allowed the interpretation by the isoscelesH amiltonian.…”

Section: Spin Triangles As Playgrounds For Magnetic Modelsmentioning

confidence: 99%

Half‐Integer Spin Triangles: Old Dogs, New Tricks

Boudalis

2021

Chemistry A European J

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Spin triangles, that is, triangularc omplexes of halfinteger spins,a re the oldest molecular nanomagnets (MNMs). Their magnetic properties have been studied long before molecular magnetism was delineated as ar esearch field. This Review presentst he history of their study,w ith references to the parallel developmento fn ew experimental investigations andn ew theoretical ideas used for their interpretation. It then presents an indicative list of spin-triangle familiest oi llustrate their chemical diversity.F inally,i tm akes reference to recent developments in terms of theoretical ideas and new phenomena, as well as to the relevance of spin triangles to spintronic devices and new physics.

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“…After Kambe's original use of an equilateral isotropic exchange (HDvV) model to interpret the magnetic properties of antiferromagnetic (AF) spin triangles, an equilateral‐to‐isosceles symmetry breaking was considered to account for low‐temperature magnetic susceptibility data . This is known as the “magnetic Jahn–Teller effect”, and was also considered in a dynamic context of atomic vibrations .…”

Section: Resultsmentioning

confidence: 99%

Origin of Ferromagnetism and Magnetic Anisotropy in a Family of Copper(II) Triangles

Rogez

Amor

Robert

et al. 2020

Chemistry A European J

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Previously reported ferromagnetic triangles (NnBu 4) 2 [Cu 3 (m 3-Cl) 2 (m-4-NO 2-pz) 3 Cl 3 ] (1), (PPN) 2 [Cu 3 (m 3-Cl) 2 (mpz) 3 Cl 3 ] (2), (bmim) 2 [Cu 3 (m 3-Cl) 2 (m-pz) 3 Cl 3 ] (3) and newly reported (PPh 4) 2 [Cu 3 (m 3-Cl) 2 (m-4-Ph-pz) 3 Cl 3 ] (4) were studied by magnetic susceptometry, electron paramagnetic resonance (EPR) spectroscopy and ab initio calculations to assess the origins of their ferromagnetism and of the magnetic anisotropy of their ground S = 3/2 state (PPN + = bis(triphenylphosphine)iminium, bmim + = 1-butyl-3-methylbenzimidazolium, pz À = pyrazolate). Ab initio studies revealed the d z 2 character of the magnetic orbitals of the compressed trigonal bipyramidal copper(II) ions. Ferromagnetic interactions were attributed to weak orbital overlap via the pyrazolate bridges. From the wavefunctions expansions, the ratios of the magnetic couplings were determined, which were indeterminate by magnetic susceptometry. Single-crystal EPR studies of 1 were carried out to extend the spin Hamiltonian with terms which induce zero-field splitting (zfs), namely dipolar interactions, anisotropic exchange and Dzyaloshinskii-Moriya interactions (DMI). The data were treated through both a giant-spin model and through a multispin exchangecoupled model. The latter indicated that % 62 % of the zfs is due to anisotropic and % 38 % due to dipolar interactions. The powder EPR data of all complexes were fitted to a simplified form of the multispin model and the anisotropic and dipolar contributions to the ground state zfs were estimated.

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Couplage de spins dans une molécule contenant trois ions chromiques. Propriétés magnétiques entre 1,6°K et 293°K de l'acétate complexe [Cr 3 (CH 3 COO) 6 (OH) 2 ]Cl.8H 2 O

Cited by 47 publications

References 5 publications

Long-Range Magnetic Ordering in Iron Jarosites Prepared by Redox-Based Hydrothermal Methods

Long-Range Magnetic Ordering in Iron Jarosites Prepared by Redox-Based Hydrothermal Methods

Half‐Integer Spin Triangles: Old Dogs, New Tricks

Origin of Ferromagnetism and Magnetic Anisotropy in a Family of Copper(II) Triangles

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