Abstract
A microscopic theoretical approach for the description of spin transitions in mononuclear Co(II) compounds is suggested. Two types of interionic interactions are taken into account, namely, the electron-deformational interaction and the cooperative Jahn-Teller interaction arising from the coupling of the low-spin state of the Co(II) ion with the tetragonal vibrations of the nearest surrounding. The different role of these interactions in the spin transformation is demonstrated and discussed. A qualitative and quantitative explanation of the experimental data on the temperature dependence of the magnetic susceptibility for the [Co(pyterpy)2](PF6)2 compound is given
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