Abstract
The spin transition from a high-spin state to a low-spin state of Fe(III) ions in the compounds Fe(4-OCH3-SalEen)2Y (Y = PF6, NO3) is investigated using the electron paramagnetic resonance (EPR) method. It is established that, unlike the compound with the PF6 anion, the compound with the NO3 anion is characterized by a temperature hysteresis of the properties of the spin transition. The thermodynamic characteristics of the spin transitions are determined from the EPR data. It is demonstrated that the specific features of the thermal evolution of the formation of the low-spin complexes are consistent with the domain model of the development of the spin transition.
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