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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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    Butterfly M2 IIIEr2 (MIII = Fe and Al) SMMs: Synthesis, Characterization, and Magnetic Properties

    Peng, Yan, Mereacre, Valeriu, Anson, Christopher E, Powell, Annie K
    ACS omega, 30 June 2018, Vol.3(6), pp.6360-6368

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    Tridecanuclear [MnIII 5 LnIII 8 ] Complexes Derived from N-tButyl-diethanolamine: Synthesis, Structures, and Magnetic Properties

    M. Ako, Ayuk, Mereacre, Valeriu, Clérac, Rodolphe, J. Hewitt, Ian, Lan, Yanhua, Buth, Gernot, E. Anson, Christopher, K. Powell, Annie
    Inorganic chemistry, 2009, Vol.48(14) [Peer Reviewed Journal]
    Hyper Article en Ligne (CCSd), Hyper Article en Ligne Open Access (CCSd)
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    Title: Tridecanuclear [MnIII 5 LnIII 8 ] Complexes Derived from N-tButyl-diethanolamine: Synthesis, Structures, and Magnetic Properties
    Author: M. Ako, Ayuk; Mereacre, Valeriu; Clérac, Rodolphe; J. Hewitt, Ian; Lan, Yanhua; Buth, Gernot; E. Anson, Christopher; K. Powell, Annie
    Subject: Chemical Sciences ; Coordination Chemistry ; Synthesis ; Magnetic Properties ; Structures ; Chemistry
    Description: The synthesis, structures and magnetic properties of a family of heterometallic [MnIII 5 LnIII 8 (μ3-OH)12(L2)4(piv)12- (NO3)4(OAc)4]- (Ln = Pr, 2; Nd, 3; Sm, 4; Gd, 5; Tb, 6) aggregates are reported. The complexes were obtained from the direct reaction of N-tbutyldiethanolamine (H2L2) with Mn(OAc)2 3 4H2O and Ln(NO3)3 3 6H2O in the presence of pivalic acid (pivH) in MeCN under ambient conditions. Compounds 2-6 are isomorphous and crystallize in the monoclinic space group P21/n with four molecules in the unit cell. The complexes have a centrosymmetric tridecanuclear anionic core consisting of two distorted inner heterometallic [MnIIILnIII 3 (μ3-OH)4]8+ cubane subunits sharing a common Mn vertex flanked by four edge-sharing heterometallic [MnIIILnIII 2 (μ3-OH)4]5+ defect cubane units. Complexes 2-6 are the first high-nuclearity 3d-4f aggregates reported to date using tBu-deaH2 as ligand. These compounds show no evidence of slow relaxation behavior above 1.8 K, which appears...
    Is part of: Inorganic chemistry, 2009, Vol.48(14)
    Identifier: 0020-1669 (ISSN); 1520-510X (E-ISSN); 10.1021/ic900645d (DOI)

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    Syntheses, Crystal Structure, Electrocatalytic, and Magnetic Properties of the Monolanthanide-Containing Germanotungstates [Ln(H2O) n GeW11O39]5– (Ln = Dy, Er, n = 4,3)

    Ibrahim, Masooma, Mbomekallé, Israël M, de Oliveira, Pedro, Baksi, Ananya, Carter, Anthony B, Peng, Yan, Bergfeldt, Thomas, Malik, Sharali, Anson, Christopher E
    ACS omega, 24 December 2019, Vol.4(26), pp.21873-21882