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Magnetic Anisotropy and Spin Coupling in a Cobalt(II) Dimer with Bioinspired Bridges
Alan Almeida1, Ana Clara das Neves2, Paula Brandão3
1Instituto de Física Armando Dias Tavares, Universidade do Estado do Rio de Janeiro, R. São Francisco Xavier 524, Rio de Janeiro 20550-900, RJ, Brazil.
Abstract:
Cobalt-(II) metal complexes constitute a versatile platform for investigating how coordination geometry and spin-orbit coupling determine their magnetic properties. Although numerous cobalt-(II) coordination complexes have been reported in recent literature, only a limited number exhibit comprehensive and quantitatively reliable magnetic characterization. In this work, we investigate the magnetic properties of the hexacoordinated cobalt dimer [Co2(μ-L1H)2(μ-H2O)2(H2O)4]-4NO3·2H2O, where L1H denotes the adenine bridging ligand. The hexacoordinated environment stabilizes a high-spin S = 3/2 configuration for both Co-(II) centers, resulting in strong spin-orbit coupling and significant zero-field splitting, described by axial (D) and rhombic (E) anisotropy parameters. Fits to magnetic susceptibility and magnetization data reveal antiferromagnetic coupling between the Co-(II) ions, with a ratio of E/D ≈ 1/4 and D/k B = 89 K, evidencing pronounced magnetic anisotropy in the system. This behavior is further supported by anisotropic Landé factors g x = g y = 2.5 and g z = 2.4, consistent with easy-plane magnetic anisotropy.
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