Solvothermal synthesis of [Cr10(μ-O2CMe)10(μ-OR)20] ‘chromic wheels’ with antiferromagnetic (R = Et) and ferromagnetic (R = Me) Cr(iii)···Cr(iii) interactions

McInnes, Eric J. L.; Anson, Christopher E.; Powell, Annie K.; Thomson, Andrew J.; Poussereau, Sandrine; Sessoli, Roberta

doi:10.1039/b007773i

Cited by 83 publications

(70 citation statements)

References 13 publications

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“…Even member rings of antiferromagnetic spins are quite common for transition metal ions, like Fe(III) [6][7][8][9][10], Cr(III) [11,12], Cu(II) [13], or Mn(III) [14]. Antiferromagnetic iron rings with N= 6, 8, 10, 12, and 18 have been reported and their properties analyzed in some detail.…”

Section: Introductionmentioning

confidence: 99%

Spin frustration effects in an odd-member antiferromagnetic ring and the magnetic Möbius strip

Cador

Gatteschi

Sessoli

et al. 2005

Journal of Magnetism and Magnetic Materials

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The magnetic properties of the first odd-member antiferromagnetic ring comprising eight chromium(III) ions, S=3/2 spins, and one nickel(II) ion, S=1 spin, are investigated. The ring possesses an even number of unpaired electrons and a S=0 ground state but, due to competing AF interactions, the first excited spin states are close in energy. The spin frustrated ring is visualized by a Möbius strip. The "knot" of the strip represents the region of the ring where the AF interactions are more frustrated. In the particular case of this bimetallic ring electron paramagnetic resonance (EPR) has unambiguously shown that the frustration is delocalized on the chromium chain, while the antiparallel alignment is more rigid at the nickel site.

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Section: Introductionmentioning

confidence: 99%

Spin frustration effects in an odd-member antiferromagnetic ring and the magnetic Möbius strip

Cador

Gatteschi

Sessoli

et al. 2005

Journal of Magnetism and Magnetic Materials

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“…8 Larger Cr (III) clusters displaying ferromagnetic exchange are even more rare, with only two examples known. 9,10 The first is an unusual sulfide-centred tetrahedron externally bridged with acetates, [Cr 4 S(O 2 CCH 3 ) 8 10 ] (R = Me or Et, R′ = Me, Et, CMe 3 ). 10 In the latter case the bridging unit between pairs of neighbouring Cr(III) ions consists of two alkoxides and one carboxylate.…”

Section: Introductionmentioning

confidence: 99%

A simple methodology for constructing ferromagnetically coupled Cr(iii) compounds

et al. 2018

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A large family of chromium(III) dimers has been synthesised and magneto-structurally characterised using a combination of carboxylate and diethanolamine type ligands. The compounds have the general formula . Removal of the carboxylate to produce the dialkoxide-bridged compound 9 resulted in antiferromagnetic (AFM) exchange between the Cr(III) ions. DFT calculations reveal the ferromagnetic exchange is the result of an orbital counter-complementarity effect occuring upon introduction of the bridging carboxylate.

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“…To analyze low-field susceptibility data, classical spin models and scaled-up data from smaller systems can sometimes be useful. 6,11,12,14 However, the level-crossings that are observed in high-field experiments have no classical analog and cannot be easily scaled up. For this reason, reliable theoretical data has previously been lacking, and a main goal of the current work is to remedy this situation through detailed QMC calculations.…”

Section: Spectral Coefficientsmentioning

confidence: 99%

“…1,2,3,4,5 In particular, there is a large family of so-called ring-type magnetic molecules 3,6,7,8,9,10,11,12,13,14,15,16 that we focus on in the present work. Within such molecules there are embedded an even number N of identical paramagnetic ions of intrinsic spin s occupying N equally-spaced sites defining a ring.…”

Section: Introductionmentioning

confidence: 99%

“…Within such molecules there are embedded an even number N of identical paramagnetic ions of intrinsic spin s occupying N equally-spaced sites defining a ring. Each such ion ("spin") is coupled to its two nearest neighbors via an AF exchange interaction, resulting in systems that can often 6,7,10,11,12,14 be well represented by an isotropic Heisenberg model with a single exchange energy, J > 0, of the form…”

Section: Introductionmentioning

confidence: 99%

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Low-temperature magnetization and the excitation spectrum of antiferromagnetic Heisenberg spin rings

Engelhardt

Luban

2006

Phys. Rev. B

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Accurate results are obtained for the low temperature magnetization versus magnetic field of Heisenberg spin rings consisting of an even number N of intrinsic spins s = 1/2, 1, 3/2, 2, 5/2, 3, 7/2 with nearest-neighbor antiferromagnetic (AF) exchange by employing a numerically exact quantum Monte Carlo method. A straightforward analysis of this data, in particular the values of the levelcrossing fields, provides accurate results for the lowest energy eigenvalue EN (S, s) for each value of the total spin quantum number S. In particular, the results are substantially more accurate than those provided by the rotational band approximation. For s ≤ 5/2, data are presented for all even N ≤ 20, which are particularly relevant for experiments on finite magnetic rings. Furthermore, we find that for s ≥ 3/2 the dependence of EN (S, s) on s can be described by a scaling relation, and this relation is shown to hold well for ring sizes up to N = 80 for all intrinsic spins in the range 3/2 ≤ s ≤ 7/2. Considering ring sizes in the interval 8 ≤ N ≤ 50, we find that the energy gap between the ground state and the first excited state approaches zero proportional to 1/N α , where α ≈ 0.76 for s = 3/2 and α ≈ 0.84 for s = 5/2. Finally, we demonstrate the usefulness of our present results for EN (S, s) by examining the Fe12 ring-type magnetic molecule, leading to a new, more accurate estimate of the exchange constant for this system than has been obtained heretofore.

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Solvothermal synthesis of [Cr10(μ-O2CMe)10(μ-OR)20] ‘chromic wheels’ with antiferromagnetic (R = Et) and ferromagnetic (R = Me) Cr(iii)···Cr(iii) interactions

Abstract: Two decanuclear cyclic Cr(III) complexes have been synthesised in high yield by solvothermal techniques: magnetic susceptibility studies reveal ferromagnetic Cr…Cr exchange in one, and antiferromagnetic Cr…Cr exchange in the other.

Cited by 83 publications

References 13 publications

Spin frustration effects in an odd-member antiferromagnetic ring and the magnetic Möbius strip

Spin frustration effects in an odd-member antiferromagnetic ring and the magnetic Möbius strip

A simple methodology for constructing ferromagnetically coupled Cr(iii) compounds

Low-temperature magnetization and the excitation spectrum of antiferromagnetic Heisenberg spin rings

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