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    Reduction of Mn19 Coordination Clusters on a Gold Surface

    Dreiser, Jan, Ako, Ayuk M., Wäckerlin, Christian, Heidler, Jakoba, Anson, Christopher E., Powell, Annie K., Piamonteze, Cinthia, Nolting, Frithjof, Rusponi, Stefano, Brune, Harald
    École Polytechnique Fédérale de Lausanne (EPFL)
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    Title: Reduction of Mn19 Coordination Clusters on a Gold Surface
    Author: Dreiser, Jan; Ako, Ayuk M.; Wäckerlin, Christian; Heidler, Jakoba; Anson, Christopher E.; Powell, Annie K.; Piamonteze, Cinthia; Nolting, Frithjof; Rusponi, Stefano; Brune, Harald
    Publisher: Amer Chemical Soc (Washington)
    Date: 2015
    Subject: Chemistry;
    Description: The magnetic properties of a Mn-19 coordination cluster equipped with methylmercapto substituents on the organic ligands, [(Mn12Mn7II)-Mn-III(mu(4)-O)(8)(mu(3)-Cl)(7.7)(mu(3)-OMe)(0.3)(HLSMe)(12)(MeOH)(6)]Cl-2 center dot 27MeCN (Mn-19(SMe)) (H3LSMe = 2,6-bis(hydroxymethyl)-4-mercaptomethylphenol) deposited on Au(111) surfaces from solution, have been investigated by X-ray absorption spectroscopy and X-ray magnetic circular dichroism. The data reveal that in the submonolayer regime the molecules contain only divalent MnII in contrast to the presence of Mn-II and Mn-III ions in the powder sample. Brillouin function fits to the field-dependent magnetization suggest that the total spin ground state in the submonolayer is much lower than S-TOT = 83/2 of the pristine molecules. These findings suggest that significant changes of the electronic structure, molecular geometry, and intramolecular exchange coupling take place upon surface deposition. A sample with coverage of 2-3 monolayers shows the presence of Mn-III, suggesting that a decoupling layer could stabilize the Mn-19 core on a metallic surface.
    Identifier: 10.1021/jp510240b (DOI)

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    Spectroscopic, structural and DFT study of the responses of carbonylmetal crown ether complexes to alkali metal cations

    Stephenson, G. Richard
    Anson, Christopher E, Creaser, Colin S, Daul, Claude A
    European Journal of Inorganic Chemistry. - 2011///2086–2097
    2011-04-20
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    Title: Spectroscopic, structural and DFT study of the responses of carbonylmetal crown ether complexes to alkali metal cations
    Author: Stephenson, G. Richard
    Contributor: Anson, Christopher E; Creaser, Colin S; Daul, Claude A
    Date: 2011-04-20
    Description: FTIR spectra of tricarbonyl(η⁶-benzo-15-crown-5)chromium(0) (1) in the presence of lithium, sodium and potassium perchlorate salts in methanol show different responses in the Cr–CO vibrational region of the spectrum. Data from the symmetric (νsym) and antisymmetric (νasym) Cr–CO vibrational stretching modes have been analysed by principal component analysis (PCA) to generate a factor score plot that provides a visual representation of these differential responses. X-ray crystallographic data for the sodium perchlorate complex 1·Na⁺ and dimensions from DFT-derived structures of 1·Li⁺, 1·Na⁺ and 1·K⁺ indicate that binding M⁺ in the crown causes electron density and structural changes in the [O(4)–C(9)–C(4)–O(8)]Cr–C(1)=O(1) sections of 1, which vary depending on the nature of the cation. This suggests a mode of action in which Li⁺ associates with a more compact O(4)–C(9)–C(4)–O(8), while Na⁺ and K⁺ differ crucially in the extent of σ and π contributions to their effect on νsym and νasym. A comparison of the FTIR data from 1, tricarbonyl(η⁶-1-phenyl-1-aza-15-crown-5)chromium(0) (2) and tricarbonyl(η⁶-2-phenyl-15-crown-5)chromium(0) (3) with a wider range of cations (NH₄⁺, Li⁺, Na⁺, K⁺, Rb⁺, Cs⁺, Mg²⁺, Ba²⁺) and anions (AcO⁻, BPh₄⁻, Br⁻, C1O₄⁻, I⁻, SCN⁻), showed that 1 and 3 both responded significantly to the different metal cations, but 2 did not. The relative cation differentiation of 1, 2 and 3 was measured using the parameter ΔR(cation), and ratios of ΔN(cation) values [calculated from ΔR(cation)] distinguished different effects in the FTIR spectra of 1 and 3 for different pairs of cations.
    Linked entry: European Journal of Inorganic Chemistry. - 2011///2086–2097
    Host document: European Journal of Inorganic Chemistry
    Identifier: 10.1002/ejic.201001274 (DOI)

    • Several versions

    Energy dependence of the freeze-out eccentricity from the azimuthal dependence of hbt at star

    Anson, Christopher
    Journal of Physics G: Nuclear and Particle Physics, 2011, Vol.38(12), p.124148 (4pp) [Peer Reviewed Journal]

    • Several versions

    Tuning of Hula-Hoop Coordination Geometry in a Dy Dimer

    Peng, Yan, Mereacre, Valeriu, Anson, Christopher, Powell, Annie
    Inorganics, 2016, Vol.4(1), p.2 [Peer Reviewed Journal]

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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]
    © ProQuest LLC All rights reserved, Materials Science Database, Advanced Technologies & Aerospace Database, Publicly Available Content Database, ProQuest Advanced Technologies & Aerospace Collection, ProQuest Materials Science Collection, ProQuest Technology Collection, ProQuest SciTech Collection, Materials Science & Engineering Database, ProQuest Central (new), ProQuest Central Korea, SciTech Premium Collection, Technology Collection, ProQuest Central Essentials, ProQuest One Academic, Materials Science Collection (ProQuest)
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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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    Energy dependent Hanbury Brown - Twiss interferometry and the freeze-out eccentricity of heavy ion collisions at STAR

    Anson, Christopher Daniel
    Electronic Theses and Dissertations (OhioLINK)
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    Title: Energy dependent Hanbury Brown - Twiss interferometry and the freeze-out eccentricity of heavy ion collisions at STAR
    Author: Anson, Christopher Daniel
    Publisher: The Ohio State University / OhioLINK
    Date: 21 May 2014
    Subject: Nuclear Physics ; Hbt ; Femtoscopy ; Beam Energy Scan ; Rhic ; Star

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    Synthesis and characterization of a mixed-valent Mn 11 –La 2 aggregate with benzoate

    Akhtar, Muhammad, Lan, Yanhua, Mereacre, Valeriu, AlDamen, Murad, Anson, Christopher, Powell, Annie
    Monatshefte für Chemie - Chemical Monthly, 2017, Vol.148(5), pp.887-891 [Peer Reviewed Journal]
    Springer Science & Business Media B.V.
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    Title: Synthesis and characterization of a mixed-valent Mn 11 –La 2 aggregate with benzoate
    Author: Akhtar, Muhammad; Lan, Yanhua; Mereacre, Valeriu; AlDamen, Murad; Anson, Christopher; Powell, Annie
    Subject: Coordination chemistry ; Metal complex ; X-ray structure determination ; Magnetic properties
    Description: A new mixed-valent Mn–Ln complex with an Mn 9 III Mn 2 II La2 core [ Mn 9 III Mn 2 II La 2 ( μ 4 - O ) 7 ( μ 3 - O ) ( μ 3 - OH ) 2 ( benzoate ) 18 ( NO 3 ) ( MeCN ) ] has been synthesized. Its magnetic characterization reveals a complex with dominating slow relaxation. In addition, alternating current (ac) susceptibility measurements reveal a frequency-dependent out-of-phase (χ′′M) signal below 4 K, suggesting the complex to be a single-molecule magnet. Graphical abstract
    Is part of: Monatshefte für Chemie - Chemical Monthly, 2017, Vol.148(5), pp.887-891
    Identifier: 0026-9247 (ISSN); 1434-4475 (E-ISSN); 10.1007/s00706-016-1820-9 (DOI)

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    Multitechnique investigation of Dy3-implications for coupled lanthanide clusters

    Gysler, Maren, El Hallak, Fadi, Ungur, Liviu, Marx, Raphael, Hakl, Michael, Neugebauer, Petr, Rechkemmer, Yvonne, Lan, Yanhua, Sheikin, Ilya, Orlita, Milan, Anson, Christopher E, Powell, Annie K, Sessoli, Roberta, Chibotaru, Liviu, van Slageren, Joris
    Chemical Science, 2016, Vol.7(7), pp.4347-4354 [Peer Reviewed Journal]
    KU Leuven Association
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    Title: Multitechnique investigation of Dy3-implications for coupled lanthanide clusters
    Author: Gysler, Maren; El Hallak, Fadi; Ungur, Liviu; Marx, Raphael; Hakl, Michael; Neugebauer, Petr; Rechkemmer, Yvonne; Lan, Yanhua; Sheikin, Ilya; Orlita, Milan; Anson, Christopher E; Powell, Annie K; Sessoli, Roberta; Chibotaru, Liviu; van Slageren, Joris
    Description: In-depth investigations of the low energy electronic structures of mononuclear lanthanide complexes, including single molecule magnets, are challenging at the best of times. For magnetically coupled polynuclear systems, the task seems well nigh impossible. However, without detailed understanding of the electronic structure, there is no hope of understanding their static and dynamic magnetic properties in detail. We have been interested in assessing which techniques are most appropriate for studying lanthanide single-molecule magnets. Here we present a wide ranging theoretical and experimental study of the archetypal polynuclear lanthanide single-molecule magnet Dy3 and derive the simplest model to describe the results from each experimental method, including high-frequency electron paramagnetic resonance and far-infrared spectroscopies and cantilever torque magnetometry. We conclude that a combination of these methods together with ab initio calculations is required to arrive at a full understanding of the properties of this complex, and potentially of other magnetically coupled lanthanide complexes.
    Is part of: Chemical Science, 2016, Vol.7(7), pp.4347-4354
    Identifier: 2041-6520 (ISSN); 10.1039/C6SC00318D (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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    Antimycobacterial activity of mixed-ligand copper quinolone complexes

    Saha, Dilip, Padhye, Subhash, Anson, Christopher, Powell, Annie
    Transition Metal Chemistry, 2003, Vol.28(5), pp.579-584 [Peer Reviewed Journal]
    Springer Science & Business Media B.V.
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    Title: Antimycobacterial activity of mixed-ligand copper quinolone complexes
    Author: Saha, Dilip; Padhye, Subhash; Anson, Christopher; Powell, Annie
    Description: New mixed-ligand Cu II , complexes: [Cu(cf)(phen)Cl)](BF 4 ) · 4H 2 O (3) , [Cu(cf)(bipy)(Cl)](BF 4 ) · 2H 2 O (4) and [Cu(cf)(dafone)(Cl)](BF 4 ) · 2H 2 O (5) (cf = ciprofloxacin, phen = 1,10-phenanthroline, bipy = 2,2′-bipyridine and dafone = 4,5-diazafluoren-9-one) have been isolated and characterized by elemental analyses, i.r., u.v.–vis. spectra, magnetic susceptibility and cyclic voltammetry. Complex (4) crystallizes in the monoclinic space group P2 1 /n with a = 13.8919(13) Å, b = 14.5718(13) Å, c = 14.0725(13) Å, β = 95.150(2)°, V =2837.2(5) Å 3 . All complexes possess square-pyramidal geometry. The antimycobacterial activity of ciprofloxacin and complexes (3–5) has been evaluated against Mycobacterium smegmatis , which shows clear enhancement in the antitubercular activity upon copper complexation with N—N donors.
    Is part of: Transition Metal Chemistry, 2003, Vol.28(5), pp.579-584
    Identifier: 0340-4285 (ISSN); 1572-901X (E-ISSN); 10.1023/A (DOI)