Counter-complementarity control of the weak exchange interaction in a bent {Ni(ii)3 complex with a μ-phenoxide-μ-carboxylate double bridge
We have prepared and structurally characterized a novel {Ni3} bent complex bearing a double μ-phenoxide-μ-carboxylate bridge. Both terminal Ni(ii) sites are symmetry related, offering a simplified exchange interaction scheme. DC magnetic data is consistent with a weak antiferromagnetic interaction between the central and terminal Ni(ii) ions. As expected for a Ni(ii) system, local zero-field splitting is observed, which can be experimentally established. Broken symmetry quantum chemical calculations, as well as ab initio CASSCF-SA-SOC computations that support the magnetic experimental data, were also performed. From the analysis of other reported closely related Ni(ii) systems, a counter-c…
Structural characterization and magnetic property studies of a mixed-valence {CoIIICoII4} complex with a μ4-oxo tetrahedral {CoII4} motif
We have synthesized and structurally characterized a new mixed valence pentanuclear Co complex, bearing a rare μ4-O-tetrahedral CoII4 unit, by employing a pyridine-like Schiff base ligand. We have performed DC magnetic susceptibility and magnetization measurements over polycrystalline samples and chemical quantum computations in order to understand the exchange interaction pattern within Co(II) sites and ground state magnetic anisotropy. This new complex shows an overall antiferromagnetic exchange interaction whose strength strongly depends on the local symmetry of Co(II) sites. Also, local ion magnetic anisotropy reveals a strongly axial behaviour with the lowest Kramers doublet (KD) at ea…
CCDC 1938756: Experimental Crystal Structure Determination
Related Article: Guillermo Fiorini, Luca Carrella, Eva Rentschler, Pablo Alborés|2019|New J.Chem.|43|16218|doi:10.1039/C9NJ03574E
CCDC 1950549: Experimental Crystal Structure Determination
Related Article: Guillermo Fiorini, Luca Carrella, Eva Rentschler, Pablo Alborés|2020|Dalton Trans.|49|932|doi:10.1039/C9DT03561C