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Dive into the research topics where Christopher E. Anson is active.

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Featured researches published by Christopher E. Anson.


Chemistry: A European Journal | 2008

Heterometallic [Mn5‐Ln4] Single‐Molecule Magnets with High Anisotropy Barriers

Valeriu Mereacre; Ayuk M. Ako; Rodolphe Clérac; Wolfgang Wernsdorfer; Ian J. Hewitt; Christopher E. Anson; Annie K. Powell

The reaction of [Mn6O2(Piv)(10)(4-Me-py)(2.5)(PivH)(1.5)] (1) (py: pyridine, Piv: pivilate) with N-methyldiethanolamine (mdeaH2) and Ln(NO3)3 x 6 H2O in MeCN leads to a series of nonanuclear compounds [Mn5Ln4(O)6(mdea)2(mdeaH)2(Piv)6(NO3)4(H2O)2]2 MeCN (Ln=Tb(III) (2), Dy(III) (3), Ho(III) (4), Y(III) (5)). Single-crystal X-ray diffraction shows that compounds 2-5 are isostructural, with the central core composed of two distorted {Mn(IV)Mn(III)Ln2O4} cubanes sharing a Mn(IV) vertex, representing a new heterometallic 3d-4f motif for this class of ligand. The four new compounds display single-molecule magnet (SMM) behaviour, which is modulated by the lanthanide ion used. Moreover, the values found for Delta(eff) and tau(o) for 3 of 38.6 K and 3.0 x 10(-9) s respectively reveal that the complex 3 exhibits the highest energy barrier recorded so far for 3d-4f SMMs. The slow relaxation of the magnetisation for 3 was confirmed by mu-SQUID measurements on an oriented single crystal and the observation of M versus H hysteresis loops below 1.9 K.


Inorganic Chemistry | 2008

Anion-Perturbed Magnetic Slow Relaxation in Planar {Dy4} Clusters

Yan-Zhen Zheng; Yanhua Lan; Christopher E. Anson; Annie K. Powell

Two planar tetranuclear dysprosium(III) complexes, [Dy(4)(mu(3)-OH)(2)(hmmpH)(2)(hmmp)(2)(Cl)(4)].3MeCN.MeOH (1) and [Dy(4)(mu(3)-OH)(2)(hmmpH)(2)(hmmp)(2)(N(3))(4)].4MeOH (2) {hmmpH(2) = 2-[(2-hydroxyethylimino)methyl]-6-methoxyphenol}, which exhibit an anion-dependent magnetic slow relaxation behavior, have been synthesized by in situ condensation of o-vanillin and 2-aminoethanol. The higher energy barrier observed in 2 could be the result of a more favorable crystal field and/or orientations of single-ion easy axes of magnetization of the Dy(III) ions.


Physical Review Letters | 2008

Spin Chirality in a Molecular Dysprosium Triangle: The Archetype of the Noncollinear Ising Model

Javier Luzón; Kevin Bernot; Ian J. Hewitt; Christopher E. Anson; Annie K. Powell; Roberta Sessoli

Single crystal magnetic studies combined with a theoretical analysis show that cancellation of the magnetic moments in the trinuclear Dy3+ cluster [Dy{3}(mu{3}-OH)2L3Cl(H2O){5}]Cl{3}, resulting in a nonmagnetic ground doublet, originates from the noncollinearity of the single-ion easy axes of magnetization of the Dy3+ ions that lie in the plane of the triangle at 120 degrees one from each other. This gives rise to a peculiar chiral nature of the ground nonmagnetic doublet and to slow relaxation of the magnetization with abrupt accelerations at the crossings of the discrete energy levels.


Angewandte Chemie | 2012

Coexistence of Distinct Single‐Ion and Exchange‐Based Mechanisms for Blocking of Magnetization in a CoII2DyIII2 Single‐Molecule Magnet

Kartik Chandra Mondal; Alexander Sundt; Yanhua Lan; George E. Kostakis; Oliver Waldmann; Liviu Ungur; Liviu F. Chibotaru; Christopher E. Anson; Annie K. Powell

Two ways to relax: A defect-dicubane Co2Dy2 single-molecule magnet (SMM) displays slow relaxation of magnetization with a blocking temperature of 22 K (at 1500 Hz), the highest reported for a 3d–4f-based SMM. Analysis of the relaxation reveals two distinct blocking regimes, one of which is intraionic, localized on the DyIII ions, while the other is exchange-based.


Chemical Communications | 2009

Opening up a dysprosium triangle by ligand oximation

Ian J. Hewitt; Yanhua Lan; Christopher E. Anson; Javier Luzón; Roberta Sessoli; Annie K. Powell

A simple trinuclear dysprosium complex shows complex slow relaxation of the magnetisation.


Bioorganic & Medicinal Chemistry Letters | 2003

Structural chemistry and In vitro antitubercular activity of acetylpyridine benzoyl hydrazone and its copper complex against Mycobacterium smegmatis.

Jayendra Patole; Uday Sandbhor; Subhash Padhye; Dileep N. Deobagkar; Christopher E. Anson; Annie K. Powell

Acetylpyridine benzoyl hydrazone (APBH) 1 and its copper complex [[(APBH)CuCl](2)].(EtOH) 2 were structurally characterized by elemental analysis, magnetic measurements, spectroscopy, electrochemistry and single crystal X-ray diffraction studies. The ligand assumes Z-isomeric form and planar geometry in solid state, coordinating through pyridyl nitrogen, azomethine nitrogen and the carbonyl oxygen of the benzoyl group. The copper complex is dimeric and has a distorted octahedral geometry in which the two copper atoms are bridged by two chloride atoms. Antimycobacterial screening of ligand and its copper compound against Mycobacterium smegmatis shows clear enhancement in the antitubercular activity upon copper complexation.


Inorganic Chemistry | 2011

Defect-Dicubane Ni2Ln2 (Ln = Dy, Tb) Single Molecule Magnets

Kartik Chandra Mondal; George E. Kostakis; Yanhua Lan; Wolfgang Wernsdorfer; Christopher E. Anson; Annie K. Powell

Two pairs of Ni(2)Dy(2) and Ni(2)Tb(2) complexes, [Ni(2)Ln(2)(L)(4)(NO(3))(2)(DMF)(2)] {Ln = Dy (1), Tb (2)} and [Ni(2)Ln(2)(L)(4)(NO(3))(2)(MeOH)(2)]·3MeOH {Ln = Dy (3), Tb (4)} (H(2)L is the Schiff base resulting from the condensation of o-vanillin and 2-aminophenol) possessing a defect-dicubane core topology were synthesized and characterized. All four complexes are ferromagnetically coupled, and the two Dy-analogues are found to be Single Molecule Magnets (SMMs) with energy barriers in the range 18-28 K. Compound 1 displays step-like hysteresis loops, confirming the SMM behavior. Although 1 and 3 show very similar structural topologies, the dynamic properties of 1 and 3 are different with blocking temperatures (3.2 and 4.2 K at a frequency of 1500 Hz) differing by 1 K. This appears to result from a change in orientation of the nitrate ligands on the Dy(III) ions, induced by changes in ligands on Ni(II).


Inorganic Chemistry | 2010

A Family of 3d-4f Octa-Nuclear [MnIII4LnIII4] Wheels (Ln = Sm, Gd, Tb, Dy, Ho, Er, and Y): Synthesis, Structure, and Magnetism

Mengyuan Li; Yanhua Lan; Ayuk M. Ako; Wolfgang Wernsdorfer; Christopher E. Anson; Gernot Buth; Annie K. Powell; Zhe-Ming Wang; Song Gao

We present the syntheses, crystal structures, and magnetochemical characterizations for a family of isostructural [Mn(4)Ln(4)] compounds (Ln = Sm, Gd, Tb, Dy, Ho, Er, and Y). They were prepared from the reactions of formic acid, propionic acid, N-n-butyl-diethanolamine, manganese perchlorate, and lanthanide nitrates under the addition of triethylamine in MeOH. The compounds possess an intriguing hetero-octanuclear wheel structure with four Mn(III) and four Ln(III) ions alternatively arranged in a saddle-like ring, where formate ions act as key carboxylate bridges. In the lattice, the molecules stack into columns in a quasi-hexagonal arrangement. Direct current (dc) magnetic susceptibility measurements indicated the depopulation of the Stark components at low temperature and/or very weak antiferromagnetic interactions between magnetic centers. The zero-field alternating current (ac) susceptibility studies revealed that the compounds containing Sm, Tb, and Dy showed frequency-dependent out-of-phase signals, indicating they are single-molecule magnets (SMMs). Magnetization versus applied dc field sweeps on a single crystal of the Dy compound down to 40 mK exhibited hysteresis depending on temperatures and field sweeping rates, further confirming that the Dy compound is a SMM. The magnetization dynamics of the Sm and Y compounds investigated under dc fields revealed that the relaxation of the Sm compound is considered to be dominated by the two-phonon (Orbach) process while the Y compound displays a multiple relaxation process.


Angewandte Chemie | 2010

Combined Magnetic Susceptibility Measurements and 57Fe Mössbauer Spectroscopy on a Ferromagnetic {FeIII4Dy4} Ring

Dirk Schray; Ghulam Abbas; Yanhua Lan; Valeriu Mereacre; Alexander Sundt; Jan Dreiser; Oliver Waldmann; Georgios E Kostakis; Christopher E. Anson; Annie K. Powell

Ferromagnetic interactions in an Fe4Dy4 single-molecule magnet were studied using a combination of magnetic susceptibility measurements (see diagram; inset: cluster core) and 57Fe Mossbauer spectroscopy.


Chemical Communications | 2006

A series of new structural models for the OEC in photosystem II

Ian J. Hewitt; Jin-Kui Tang; N. T. Madhu; Rodolphe Clérac; Gernot Buth; Christopher E. Anson; Annie K. Powell

A new series of MMn(II-III)(4) clusters (M = Na, Ca) has been structurally characterised and their relevance to understanding the oxygen evolving centre of photosystem II is discussed.

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Annie K. Powell

Karlsruhe Institute of Technology

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Yanhua Lan

Centre national de la recherche scientifique

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Valeriu Mereacre

Karlsruhe Institute of Technology

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Rodolphe Clérac

Centre national de la recherche scientifique

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Wolfgang Wernsdorfer

Centre national de la recherche scientifique

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Ayuk M. Ako

Karlsruhe Institute of Technology

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Ian J. Hewitt

Karlsruhe Institute of Technology

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Gernot Buth

Karlsruhe Institute of Technology

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