E. Carolina Sañudo

Publications (70) View all

• Article: Magnetic properties and relaxation dynamics of a frustrated Ni₇ molecular nanomagnet.

  E Garlatti, S Carretta, M Affronte, E C Sañudo, G Amoretti, P Santini
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  ABSTRACT: The Ni₇ nanomagnet represents an ideal model system for investigating the effects of geometrical frustration in magnetic interactions. The Ni ions in the magnetic core are arranged on two corner-sharing tetrahedra and interact through antiferromagnetic exchange couplings. We show that the high degree of frustration leads to a magnetic energy spectrum with large degeneracies which result in unusual static and dynamical magnetic properties. In particular, the relaxation dynamics of the magnetization is characterized by several distinct characteristic times. We also discuss the possible interest of Ni₇ for magnetocaloric refrigeration.
  Journal of Physics Condensed Matter 02/2012; 24(10):104006. · 2.55 Impact Factor
• Article: Synthesis, structure and magnetic properties of two new azido-Co(II) coordination architectures: from ferromagnetic coupling to single-chain-magnets.

  Bo-Wen Hu, Jiong-Peng Zhao, Qian Yang, Xiao-Feng Zhang, M Evangelisti, E C Sañudo, Xian-He Bu
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  ABSTRACT: Two new azido-Co(II) complexes with pyrazine carboxylato ligands, [Co(N(3))(L)·H(2)O](n) (L = pyrazine-2-carboxylato) (1) and [CoNa(N(3))(2)(L)](n) (2), have been obtained by carefully tuning the Co(II):N(3)(-) ratio. Here we present the structural and magnetic characterization of these new species. Modulation of the coordination environment of Co(II) leads to a variation of the magnetic properties of the obtained compounds. Complex 1 exhibits ferromagnetically coupled [Co(2)] units that form the rungs of the ladder with a nearly negligible coupling between these units, while complex 2 is a 2D arrangement of 1D Co(II) single-chain magnets.
  Dalton Transactions 10/2010; 39(46):11210-7. · 3.84 Impact Factor
• Article: Single-molecule-magnet behavior in a Fe(12)Sm(4) cluster.

  Yong-Fei Zeng, Guan-Cheng Xu, Xin Hu, Zhuo Chen, Xian-He Bu, Song Gao, E C Sañudo
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  ABSTRACT: Through the combination of Sm(III) spin carriers with a Fe(III) system, the largest Fe-Ln cluster so far has been synthesized. To our knowledge, the new complex, Fe(12)Sm(4), is the first Sm(III) single-molecule magnet. Furthermore, Fe(12)La(4) and Fe(12)Gd(4) have also been synthesized to help understand the magnetic exchange interactions and origin of magnetic anisotropy in Fe(12)Sm(4).
  Inorganic Chemistry 09/2010; 49(21):9734-6. · 4.60 Impact Factor
• Article: New 3D coordination polymers constructed from pillared metal-formate Kagomé layers exhibiting spin canting only in the nickel(II) complex.

  Zuo-Xi Li, Jiong-Peng Zhao, E C Sañudo, Hong Ma, Zhong-Da Pan, Yong-Fei Zeng, Xian-He Bu
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  ABSTRACT: Sparked by the strategy of pillared-layer MOFs, three formate coordination polymers, {[Ni(2)(HCO(2))(3)(L)(2)](NO(3)).2H(2)O}(infinity) (1), {[Co(2)(HCO(2))(3)(L)(2)](HCO(2)).2H(2)O}(infinity) (2), and {[Cu(2)(HCO(2))(3)(L)(2)](HCO(2)).2H(2)O}(infinity) (3), have been synthesized by employing the rodlike ligand 4,4'-bis(imidazol-1-yl)biphenyl (L) as the pillar. Structural analysis indicates that the title complexes 1-3 are isostructural compounds, which possess metal-formate 2D layers perpendicularly pillared by the ligand L to afford a 3D open framework. This is an interesting example of a Kagome lattice based on the formate mediator. Moreover, the formate anion of this 2D Kagome layer exhibits various bridging modes: anti-anti, syn-anti, and 3.21 modes. Their magnetic measurements reveals that only complex 1 presents the spin canting phenomenon, while its isostructural Co(II) and Cu(II) complexes are simply paramagnets with antiferromagnetic coupling.
  Inorganic Chemistry 11/2009; 48(24):11601-7. · 4.60 Impact Factor
• Article: A porous metal-organic framework with helical chain building units exhibiting facile transition from micro- to meso-porosity.

  Jinhee Park, Jian-Rong Li, E Carolina Sañudo, Daqiang Yuan, Hong-Cai Zhou
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  ABSTRACT: A metal-organic framework (MOF) with helical channels has been constructed by bridging helical chain secondary building units with 2,6-di-p-carboxyphenyl-4,4'-bipyridine ligands. The activated MOF shows permanent porosity and gas adsorption selectivity. Remarkably, the MOF exhibits a facile transition from micro- to meso-porosity.
  Chemical Communications 12/2011; 48(6):883-5. · 6.17 Impact Factor