Exploring the exchange interaction in a mixed valence {CoII 4CoIII2} hexanuclear cluster with novel topology
Reaction between [Co2(μ-OH2)(μ-Piv) 2(Piv)2(HPiv)4] and a (salicylidene) ethanolamine ligand under ambient reaction conditions, affords hexanuclear complexes [CoIII2CoII4(Piv) 8(HPiv)2(L)2(OH)2] (1-2). Both products have been characterized crystallographically and found to be mixed-valent, containin...
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| Autores principales: | , , , |
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| Formato: | JOUR |
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_02775387_v31_n1_p779_Lazzarini |
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| Sumario: | Reaction between [Co2(μ-OH2)(μ-Piv) 2(Piv)2(HPiv)4] and a (salicylidene) ethanolamine ligand under ambient reaction conditions, affords hexanuclear complexes [CoIII2CoII4(Piv) 8(HPiv)2(L)2(OH)2] (1-2). Both products have been characterized crystallographically and found to be mixed-valent, containing divalent and trivalent Co centers. Down to 30 K, the variable-temperature magnetic susceptibility data are dominated by the single-ion properties of high spin Co(II) centers with distorted-octahedral coordination geometries. Below this temperature, the effect of intramolecular ferromagnetic exchange interactions becomes apparent. Magnetic data has been analyzed in terms of ground isolated effective S̃=1/2Kramers doublets where low temperature magnetization data suggests an anisotropic behavior. We have also employed DFT-broken symmetry calculations to evaluate in an isotropic approach the exchange interaction pathways. © 2011 Elsevier Ltd. All rights reserved. |
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