EPR of the first Fe(III)-containing spin-crossover metallomesogens,10.1007/BF03167020,Applied Magnetic Resonance,I. V. Ovchinnikov,T. A. Ivanova,V. E.

EPR of the first Fe(III)-containing spin-crossover metallomesogens (Citations: 1)


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The low-spin (LS) to high-spin (HS) transition in two mesogenic Fe(III) complexes with alkyloxysalicyliden-N′-ethyl-N-ethylendiamine as ligands is studied by electron paramagnetic resonance (EPR). The symmetrization of the crystal field around the Fe(III) ion under first heating of a polycrystalline sample from the room temperature was observed in the spectra of HS complexes. The line narrowing (from 45 to 15 mT) under the crystal-smectic phase transition is explained by the strengthening of the intermolecular exchange interaction, as a result of the structural reorganization of layers in the smectic phase. A feature of both mesogenic spin-transition systemsis an unusual field-induced spin instability which leads to the hysteresis of the HS-LS composition. This instability is detected by EPR and magnetic susceptibility methods. The alignment of systems by magnetic field in the mesophase and a complete or partial orientational order under cooling the mesophase to the glass state are the main reason for this hysteresis. The influence of EPR-silent LS complexes reveals itself in the line broadening of HS compounds’ when the temperature is lowered from 220 K.

Journal: Applied Magnetic Resonance - APPL MAGN RESON , vol. 29, no. 2, pp. 325-334, 2005

DOI: 10.1007/BF03167020

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EPR of the first Fe(III)-containing spin-crossover metallomesogens,10.1007/BF03167020,Applied Magnetic Resonance,I. V. Ovchinnikov,T. A. Ivanova,V. E.

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Citations (1)

Electron paramagnetic resonance of spin-variable metallomesogens [Fe L 2 ] X ( X = PF 6 , SCN)


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