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Subject: Iron

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High spin cycles: topping the spin record for a single molecule verging on quantum criticality
Magnani, Nicola, Anson, Christopher, Richter, Johannes, Powell, Annie
NPJ Quantum Materials, 2018, Vol.3(1) [Peer Reviewed Journal]
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Title: High spin cycles: topping the spin record for a single molecule verging on quantum criticality
Author: Magnani, Nicola; Anson, Christopher; Richter, Johannes; Powell, Annie
Subject: Gadolinium ; Frustration ; Coordination Compounds ; Entropy ; Iron ; Contrast Agents ; Chemical Synthesis ; Energy Costs ; Critical Point ; Single Electrons ; Chains ; Magnetic Resonance Imaging ; Clusters ; Ground State ; Coupling (Molecular) ; Parameters ; Toruses ; Magnets ; Low Temperature
Description: The cyclisation of a short chain into a ring provides fascinating scenarios in terms of transforming a finite array of spins into a quasi-infinite structure. If frustration is present, theory predicts interesting quantum critical points, where the ground state and thus low-temperature properties of a material change drastically upon even a small variation of appropriate external parameters. This can be visualised as achieving a very high and pointed summit where the way down has an infinity of possibilities, which by any parameter change will be rapidly chosen, in order to reach the final ground state. Here we report a mixed 3d/4f cyclic coordination cluster that turns out to be very near or even at such a quantum critical point. It has a ground state spin of S = 60, the largest ever observed for a molecule (120 times that of a single electron). [Fe10Gd10(Me-tea)10(Me-teaH)10(NO3)10]·20MeCN forms a nano-torus with alternating gadolinium and iron ions with a nearest neighbour Fe–Gd coupling...
Is part of: NPJ Quantum Materials, 2018, Vol.3(1)
Identifier: 23974648 (E-ISSN); 10.1038/s41535-018-0082-7 (DOI)

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Multiple superhyperfine fields in a {DyFe2Dy} coordination cluster revealed using bulk susceptibility and (57)Fe Mössbauer studies
Peng, Yan, Mereacre, Valeriu, Anson, Christopher E, Powell, Annie K
Physical chemistry chemical physics : PCCP, 03 August 2016, Vol.18(31), pp.21469-80 [Peer Reviewed Journal]
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Title: Multiple superhyperfine fields in a {DyFe2Dy} coordination cluster revealed using bulk susceptibility and (57)Fe Mössbauer studies
Author: Peng, Yan; Mereacre, Valeriu; Anson, Christopher E; Powell, Annie K
Subject: Hyperfine Structure ; Physical Chemistry ; Magnetic Properties ; Clusters ; Mossbauer Effect ; Magnetic Permeability ; Mossbauer Spectroscopy ; Iron ; Miscellaneous Sciences (So) ; Chemical and Electrochemical Properties (MD) ; Chemical and Electrochemical Properties (Ep) ; Chemical and Electrochemical Properties (Ed) ; Chemical and Electrochemical Properties (EC);
Description: A [DyFeDy(μ3-OH)2(pmide)2(p-Me-PhCO2)6] coordination cluster, where pmideH2 = N-(2-pyridylmethyl)iminodiethanol, has been synthesized and the magnetic properties studied. The dc magnetic measurements reveal dominant antiferromagnetic interactions between the metal centres. The ac measurements reveal zero-field quantum tunnelling of the magnetisation (QTM) which can be understood, but not adequately modelled, in terms of at least three relaxation processes when appropriate static (dc) fields are applied. To investigate this further, (57)Fe Mössbauer spectroscopy was used and well-resolved nuclear hyperfine structures could be observed, showing that on the Mössbauer time scale, without applied field or else with very small applied fields, the iron nuclei experience three or more superhyperfine fields arising from the slow magnetisation reversal of the strongly polarized fields of the Dy(III) ions.
Is part of: Physical chemistry chemical physics : PCCP, 03 August 2016, Vol.18(31), pp.21469-80
Identifier: 1463-9084 (E-ISSN); 27424877 Version (PMID); 10.1039/c6cp02942f (DOI)

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Direct observation of the role of lanthanides in stabilizing a ferromagnetic spin orientation in a weak Fe(III)-Fe(III) antiferromagnet
Xiang, Hua, Mereacre, Valeriu, Lan, Yanhua, Lu, Tong-Bu, Anson, Christopher E, Powell, Annie K
Chemical communications (Cambridge, England), 28 August 2013, Vol.49(67), pp.7385-7 [Peer Reviewed Journal]
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Title: Direct observation of the role of lanthanides in stabilizing a ferromagnetic spin orientation in a weak Fe(III)-Fe(III) antiferromagnet
Author: Xiang, Hua; Mereacre, Valeriu; Lan, Yanhua; Lu, Tong-Bu; Anson, Christopher E; Powell, Annie K
Subject: Magnetic Fields ; Orientation ; Antiferromagnetism ; Modulation ; Ferromagnetism ; Dysprosium ; Spectra ; Iron ; Miscellaneous Sciences (So) ; Components and Materials (General) (Ea);
Description: [Fe(III)2Ln(III)2(OH)2(L(1))2(HL(2))2(NO3)4(H2O)1½(MeOH)½]·6MeCN (Ln = Y (1), Dy (2); H2L(1) = 2,3-dihydroxybenzaldehyde and H2L(2) is the Schiff base of this aldehyde with furfurylamine) have unusually weak antiferromagnetic interactions between the Fe(III) centres in comparison with other (μ-dihydroxo)diiron(III) complexes. For 1, it was established that modulation of the hydroxo bridges by coordination to the Y(III) ions results in long Fe-O bonds and small Fe-O-Fe angles, leading to J = -0.4 cm(-1). Analysis of the Mössbauer spectra reveals that the intramolecular magnetic field generated by the anisotropic Dy(III) ions in 2 is sufficient to overcome the Fe-Fe antiferromagnetic coupling and reorientate the Fe(III) moments into a ferromagnetic spin orientation.
Is part of: Chemical communications (Cambridge, England), 28 August 2013, Vol.49(67), pp.7385-7
Identifier: 1364-548X (E-ISSN); 23703636 Version (PMID); 10.1039/c3cc42416b (DOI)

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Spin relaxation in antiferromagnetic Fe–Fe dimers slowed down by anisotropic Dy III ions
Mereacre, Valeriu, Klöwer, Frederik, Lan, Yanhua, Clérac, Rodolphe, Wolny, Juliusz A, Schünemann, Volker, Anson, Christopher E, Powell, Annie K
Beilstein Journal of Nanotechnology, 2013, Vol.4, p.807-814 [Peer Reviewed Journal]

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Catalytic "triangles": binding of iron in task-specific ionic liquids
Prodius, Denis, Macaev, Fliur, Stingaci, Eugenia, Pogrebnoi, Vsevolod, Mereacre, Valeriu, Novitchi, Ghenadie, Kostakis, George E, Anson, Christopher E, Powell, Annie K
Chemical communications (Cambridge, England), 07 March 2013, Vol.49(19), pp.1915-7 [Peer Reviewed Journal]
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Title: Catalytic "triangles": binding of iron in task-specific ionic liquids
Author: Prodius, Denis; Macaev, Fliur; Stingaci, Eugenia; Pogrebnoi, Vsevolod; Mereacre, Valeriu; Novitchi, Ghenadie; Kostakis, George E; Anson, Christopher E; Powell, Annie K
Subject: Binding ; Catalysis ; Catalysts ; Charging ; Condensing ; Ionic Liquids ; Iron ; Triangles ; Miscellaneous Sciences (So) ; Components and Materials (General) (Ea);
Description: A new class of task-specific ionic liquids (ILs) which contain septuply positively charged {Fe(3)(III)O(RCOO)(6)L(3)}(7+) triangles has been synthesized and structurally characterized. Such metal-containing ILs can be repeatedly used as alternative catalysts in the synthesis of 2-pyrrolo-3'-yloxindole or the condensation of indoles with various aldehydes.
Is part of: Chemical communications (Cambridge, England), 07 March 2013, Vol.49(19), pp.1915-7
Identifier: 1364-548X (E-ISSN); 23361098 Version (PMID); 10.1039/c2cc36741f (DOI)

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Chalcogenido-Bridged Clusters by Reactions of Chalcogenostannate Salts
Zimmermann, Christian, Anson, Christopher, Dehnen, Stefanie
Journal of Cluster Science, 2007, Vol.18(3), pp.618-629 [Peer Reviewed Journal]
Springer Science & Business Media B.V.

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Title: Chalcogenido-Bridged Clusters by Reactions of Chalcogenostannate Salts
Author: Zimmermann, Christian; Anson, Christopher; Dehnen, Stefanie
Subject: Chalcogenido-bridged clusters ; chalcogenostannates ; X-ray diffractometry
Description: Reactions of [ en H] 4 [Sn 2 S 6 ] or K 6 [Sn 2 Te 6 ] with [Cp*CoCl] 2 (Cp* = C 5 Me 5 ), or [ en H] 4 [Sn 2 Se 6 ]· en ( en = 1,2-diaminoethane) with [{CpFe(CO) 2 } 2 SnCl 2 ] leads to the formation of three chalcogenido-bridged transition metal complexes via an unusual synthesis route. [(Cp*Co) 3 ( μ 3 -S) 2 ] ( 1 ), [(Cp*Co) 3 ( μ 3 -Te) 2 ] ( 2 ), and [{CpFe(CO) 2 } 3 {CpFe(CO)}Sn 3 Se 4 ] ( 3 ) were structurally characterized by means of single-crystal X-ray diffractometry and represent previously unknown homologues of a selenium bridged analogue ( 1 or 2 ) or of Fe–S clusters ( 1 or 3 ). Compounds 1 and 2 , together with the previously reported Se analogue, show a progression from a symmetrical closo -trigonal-bipyramidal structure to the square-pyramidal structure predicted by the Wade-Mingos Rules for a 50 electron cluster.
Is part of: Journal of Cluster Science, 2007, Vol.18(3), pp.618-629
Identifier: 1040-7278 (ISSN); 1572-8862 (E-ISSN); 10.1007/s10876-007-0130-0 (DOI)

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The Influence of Halide Substituents on the Structural and Magnetic Properties of Fe 6 Dy 3 Rings
Kühne, Irina A, Anson, Christopher E, Powell, Annie K
Frontiers in Chemistry, 2020, Vol.8 [Peer Reviewed Journal]

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Selected facet

High spin cycles: topping the spin record for a single molecule verging on quantum criticality

Multiple superhyperfine fields in a {DyFe2Dy} coordination cluster revealed using bulk susceptibility and (57)Fe Mössbauer studies

Direct observation of the role of lanthanides in stabilizing a ferromagnetic spin orientation in a weak Fe(III)-Fe(III) antiferromagnet

Spin relaxation in antiferromagnetic Fe–Fe dimers slowed down by anisotropic Dy III ions

Catalytic "triangles": binding of iron in task-specific ionic liquids

Chalcogenido-Bridged Clusters by Reactions of Chalcogenostannate Salts

The Influence of Halide Substituents on the Structural and Magnetic Properties of Fe 6 Dy 3 Rings