Couplage De Spins Et Anomalies De Chaleur Spécifique Aux Températures De L'Hélium Et De L'Hydrõgène Liquides Pour L'Acétate Complexe [Cr3(CH3COO)6(OH)2] Cl.8H2O

Wucher, J.; Wasscher, J.D.

doi:10.1016/s0031-8914(54)80184-4

Cited by 30 publications

(11 citation statements)

References 4 publications

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“…This parameter depicts the splitting of the S = 1/2 doublets, which is due to the nonequivalence of the isotropic exchange parameters. We observe that incorporation of antisymmetric exchange through Equation (10) leads to a slightly smaller σ compared with the one derived from a purely isotropic exchange Hamiltonian, which was considered in the analysis of the magnetic susceptibility data. From the relationship σ = 4|J -JЈ| we see that the actual J and JЈ values should be slightly different from those derived from the analysis of the magnetic susceptibility data.…”

Section: Complexesmentioning

confidence: 85%

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Syntheses, Structural, and Physical Studies of Basic Cr^III and Fe^III Benzilates and Benzoates: Evidence of Antisymmetric Exchange and Distributions of Isotropic and Antisymmetric Exchange Parameters

et al. 2006

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The synthesis, crystal structures, spectroscopic and magnetic properties studies of four trinuclear oxo‐centered carboxylate complexes are reported and discussed: [Cr3(μ3‐O){O2C(OH)Ph2}6(H2O)3](NO3)·2H2O·3Me2CO (1·2H2O·3Me2CO), [Cr3(μ3‐O)(O2CPh)6(H2O)3](NO3)·1.9MeCN·0.5H2O (2·1.9MeCN·0.5H2O), [Fe3(μ3‐O){O2C(OH)Ph2}6(H2O)3](NO3)·5.69H2O (3·5.69H2O), and [Fe3(μ3‐O)(O2CPh)6(H2O)3](NO3)·3MeCN (4·3MeCN). From a crystallographic point of view, the three metal ions form an isosceles triangle in 1 and 3 (benzilato complexes) and an almost equilateral one in 2 and 4 (benzoato complexes). Magnetic susceptibility measurements reveal metal‐dependent isotropic exchange, for the CrIII clusters (1, 2), with the “magnetic symmetry” resembling that of an almost equilateral triangle. For the FeIII clusters the “magnetic symmetry” resembles that of an isosceles triangle. Solid‐state 1H NMR studies for 1, through the measurements of the temperature variation of the relaxation rate 1/T1, reveal that the first excited spin state with ST = 3/2 is well above (ca. 30 cm–1) the ground state with ST = 1/2, consistent with the magnetic susceptibility data. Mössbauer spectroscopic studies give a larger quadrupole splitting, ΔEQ, value for 3 than for 4, because of a larger charge asymmetry in 3 attributed to the different nature of the carboxylato ligands. EPR experiments at X‐band reveal the presence of antisymmetric exchange within the CrIII clusters and distributions of both isotropic and antisymmetric exchange interactions. In the case of 2 the magnitude and distribution of these interactions are greater. EPR spectroscopy for 3 suggests weak interactions between neighboring units, which could be described assuming a dimer of trimers. For complex 4 the EPR spectra indicate a more complicated picture. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)

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Section: Complexesmentioning

confidence: 85%

“…1/2 (10) where D = 4Ί3d, and σ = 4|J -JЈ|. From this model the characteristics of the spectra shown in Figure 10 can be understood.…”

Section: Complexesmentioning

confidence: 87%

Syntheses, Structural, and Physical Studies of Basic Cr^III and Fe^III Benzilates and Benzoates: Evidence of Antisymmetric Exchange and Distributions of Isotropic and Antisymmetric Exchange Parameters

et al. 2006

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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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“…This model has been applied to many chromiuni(II1) and iron(II1) complexes, and also to specific heat measurements in the case of chromium(II1) (314), and it generally gives a superior fit to the data. This finding is hardly surprising, since the model contains an extra adjustable parameter, but the essential physical feature is that the revised model splits the ground state of the trimer, and thus gives scope for better fitting at low temperatures.…”

Section: Dimolrldkrmentioning

confidence: 99%

Chemical and Physical Properties of Triangular Bridged Metal Complexes

Cannon¹,

White²

1988

Progress in Inorganic Chemistry

409

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Couplage De Spins Et Anomalies De Chaleur Spécifique Aux Températures De L'Hélium Et De L'Hydrõgène Liquides Pour L'Acétate Complexe [Cr3(CH3COO)6(OH)2] Cl.8H2O

Cited by 30 publications

References 4 publications

Syntheses, Structural, and Physical Studies of Basic Cr^III and Fe^III Benzilates and Benzoates: Evidence of Antisymmetric Exchange and Distributions of Isotropic and Antisymmetric Exchange Parameters

Syntheses, Structural, and Physical Studies of Basic Cr^III and Fe^III Benzilates and Benzoates: Evidence of Antisymmetric Exchange and Distributions of Isotropic and Antisymmetric Exchange Parameters

Half‐Integer Spin Triangles: Old Dogs, New Tricks

Chemical and Physical Properties of Triangular Bridged Metal Complexes

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Couplage De Spins Et Anomalies De Chaleur Spécifique Aux Températures De L'Hélium Et De L'Hydrõgène Liquides Pour L'Acétate Complexe [Cr3(CH3COO)6(OH)2] Cl.8H2O

Cited by 30 publications

References 4 publications

Syntheses, Structural, and Physical Studies of Basic CrIII and FeIII Benzilates and Benzoates: Evidence of Antisymmetric Exchange and Distributions of Isotropic and Antisymmetric Exchange Parameters

Syntheses, Structural, and Physical Studies of Basic CrIII and FeIII Benzilates and Benzoates: Evidence of Antisymmetric Exchange and Distributions of Isotropic and Antisymmetric Exchange Parameters

Half‐Integer Spin Triangles: Old Dogs, New Tricks

Chemical and Physical Properties of Triangular Bridged Metal Complexes

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Syntheses, Structural, and Physical Studies of Basic Cr^III and Fe^III Benzilates and Benzoates: Evidence of Antisymmetric Exchange and Distributions of Isotropic and Antisymmetric Exchange Parameters

Syntheses, Structural, and Physical Studies of Basic Cr^III and Fe^III Benzilates and Benzoates: Evidence of Antisymmetric Exchange and Distributions of Isotropic and Antisymmetric Exchange Parameters