The observed magnetic data for two isosceles tricobalt(II) complexes have been successfully analyzed, considering the axial distortion around each cobalt(II) ion, the local spin-orbit coupling, the anisotropic exchange interactions, and the intermolecular exchange interactions. The complexes each contains two types of octahedral high-spin cobalt(II) ions (Co<sub>A</sub> and Co<sub>B</sub>) in the shape of an isosceles triangle (Co<sub>A1</sub>–Co<sub>B</sub>–Co<sub>A2</sub>), and the contribution of the orbital angular momentum is significant. The exchange interaction between the Co<sub>A</sub> and Co<sub>B</sub> ions is practically negligible (<i>J</i> = ~ 0), whereas the interaction between the Co<sub>A1</sub> and Co<sub>A2</sub> ions is ferromagnetic (<i>J</i>’ > 0) for both complexes
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