LETARD, Jean-François; DAUBRIC, H.; CANTIN, C.; KLIAVA, J.; BOUHEDJA, Yacine; NGUYEN, Olivier; KAHN, Olivier

doi:10.1080/10587259908028891

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LETARD, Jean-François
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

DAUBRIC, H.
Centre de physique moléculaire optique et hertzienne [CPMOH]

CANTIN, C.
Centre de physique moléculaire optique et hertzienne [CPMOH]

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Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, 1998-09-12, Seignosse. 1998p. 1207-1221

Gordon Breach Sci Publ Ltd

Résumé en anglais

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.< Réduire

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

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