Electron paramagnetic resonance and LIESST effect in spin-crossover cis-bis(thiocyanato)bis[N-(2-pyridyl-methylene)aminobiphenyl]iron(II) compound - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 1998

Electron paramagnetic resonance and LIESST effect in spin-crossover cis-bis(thiocyanato)bis[N-(2-pyridyl-methylene)aminobiphenyl]iron(II) compound

Résumé

Two different phases of spin-crossover cis-bis(thiocyanato)-bis(N-2′-pyridylmethylene)-4-(aminobiphenyl) iron(II), Fe(PM-BiA)2(NCS)2 have been investigated by EPR in X- and Q-bands. The EPR parameters for Mn2± show that the phase II has similar behavior to intentionally doped compound. EPR spectra as function of the temperature reveal that the spin transition of the iron(II) centers induced some modifications on the whole structure and then on the environment of the manganese ions. The LIESST effect is reported for the two phases and for Fe0.216Mn0.784(PM-BiA)2(NCS)2. The magnetic properties under irradiation of the phase II and of Fe0.216Mn0.784(PM-BiA)2(NCS)2 are very similar and the limit temperature of the HS metastable state is around Tliesst = 50 K, as compared to 80 K for the phase I. The new kind of bistability called LITH (Light Induced Thermal Hysteresis) has been observed for the three derivatives. The HS → LS relaxation is higher for the phase II and Fe0.216Mn0.784(PM-BiA)2(NCS)2 than for the Phase I.
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hal-01550228 , version 1 (19-05-2022)

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Jean-François Letard, H. Daubric, C. Cantin, J. Kliava, Yacine Bouhedja, et al.. Electron paramagnetic resonance and LIESST effect in spin-crossover cis-bis(thiocyanato)bis[N-(2-pyridyl-methylene)aminobiphenyl]iron(II) compound. 6th International Conference on Molecule Base Magnets (ICMM 98), Sep 1998, Seignosse, France. pp.1207-1221, ⟨10.1080/10587259908028891⟩. ⟨hal-01550228⟩

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