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Spin transition in [Fe(PM-BiA)(2)(NCS)(2)] studied by the electron paramagnetic resonance of the Mn2+ ion

hal.structure.identifierCentre de physique moléculaire optique et hertzienne [CPMOH]
dc.contributor.authorDAUBRIC, Hervé
hal.structure.identifierCentre de physique moléculaire optique et hertzienne [CPMOH]
dc.contributor.authorKLIAVA, Janis
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGUIONNEAU, Philippe
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCHASSEAU, Daniel
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorLÉTARD, Jean-François
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorKAHN, Olivier
dc.date.issued2000
dc.identifier.issn0953-8984
dc.description.abstractEnThe spin transition of Fe2+ ions in the mononuclear compound cis-bis(thiocyanato)-bis(N-2'-pyridylmethylene)-4-(aminobiphenyl)-iron(II) is studied by electron paramagnetic resonance (EPR) of Mn2+. In cooling the compound down to the temperature range 174-168 K, the Fe2+ ions undergo a complete transition from the high spin (HS, S = 2) to the low spin (LS, S = 0) state, occurring with a narrow, ~5 K and unusually sharp hysteresis loop. The temperature dependence of the unit cell parameters is almost linear on both sides of the spin transition; the variation of the unit cell parameters at the spin transition is very anisotropic. The EPR spectra, typical of the Mn2+ ion, only gradually change with temperature in the two spin states of Fe2+ but undergo a striking transformation in the spin transition range. This shows that a considerable cooperativity exists between the metal ions. Computer simulations using a laboratory-developed simulation program indicate significant changes in the zero-field splitting (zfs) parameters in the course of the spin transition. Lower-than-axial symmetry of the environment of Mn2+ persists in both spin states of Fe2+; however, a stronger axial distortion arises in the HS state.
dc.language.isoen
dc.publisherIOP Publishing
dc.title.enSpin transition in [Fe(PM-BiA)(2)(NCS)(2)] studied by the electron paramagnetic resonance of the Mn2+ ion
dc.typeArticle de revue
dc.identifier.doi10.1088/0953-8984/12/25/312
dc.subject.halPhysique [physics]
bordeaux.journalJournal of Physics: Condensed Matter
bordeaux.page5481-5494
bordeaux.volume12
bordeaux.issue25
bordeaux.peerReviewedoui
hal.identifierhal-01550511
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01550511v1
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