High magnetic fields study of asymmetric Co(II) dimer in octahedral ligand environment

Magnetic susceptibility calculation of the dinuclear cobalt complex [Co2(ox)tpmc](ClO4)2·3H2O

“…It should be noted that above results are in very good agreement with findings obtained from the high magnetic field experiments on the title complex [5]. …”

“…To simplify the theoretical model we have assumed that both cobalt ions have same anisotropy axis. In the extreme case of anisotropy the exchange coupling energy can be approximated by the Ising model [1,2,4,5]. For the complex under consideration this model is appropriate for low temperatures where only Kramers doublet is populated (k B Tp10 2 K).…”

Synthesis and structural characterization of two cobalt phosphites: 1-D (H3NC6H4NH3)Co(HPO3)2 and 2-D (NH4)2Co2(HPo3)3

“…In 1, magnetic coupling between cobalt ions occurs via phosphite superexchange pathways and is therefore expected to be weak. The magnetic property of 2 is apparently attributed to weak antiferromagnetic interactions between cobalt centers, as observed in the related octahedral Co(II) [24,34]. The obtained w M T products are indications that both compounds exhibit important orbit contributions at 300 K (5.16 mB for 1 and 5.31 mB for 2).…”

A novel 3D cyano-bridged mixed-valence CoII/CoIIIcanted antiferromagnet constructed from defective cubanes. Synthesis, X-ray structure and magnetic properties

“…15 It should be mentioned that only a few examples of structurally and magnetically characterized oxalato-bridged dinuclear Co(II) complexes have been reported so far and all of them contain N 4tetradentate peripheral ligands. 16,17 In three instances (compounds 2-4), 16 the oxalato ligand exhibits, as in 1, the usual symmetric inplane bis-chelating bridging mode, with J values from −8.8 cm −1 to −11.4 cm −1 (see Table 2). In one instance (compound 5), 17 however, the oxalato ligand exhibits the unusual asymmetric tridentate bridging mode with a "J" value of −11.1 cm −1 .…”

“…16,17 In three instances (compounds 2-4), 16 the oxalato ligand exhibits, as in 1, the usual symmetric inplane bis-chelating bridging mode, with J values from −8.8 cm −1 to −11.4 cm −1 (see Table 2). In one instance (compound 5), 17 however, the oxalato ligand exhibits the unusual asymmetric tridentate bridging mode with a "J" value of −11.1 cm −1 . This "J" value is for effective (S = 1/2) spins.…”