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Temperature-dependent interactions and disorder in the spin-transition compound [FeII(L)2][ClO4]2·C7H8 through structural, calorimetric, cagnetic, photomagnetic, and diffuse reflectance investigations

hal.structure.identifierGroupe d'Etude de la Matière Condensée [GEMAC]
hal.structure.identifierDepartment of Chemistry [Kanpur] [IIT Kanpur]
dc.contributor.authorMISHRA, Vibha
hal.structure.identifierDepartment of Chemistry [Kanpur] [IIT Kanpur]
dc.contributor.authorMUKHERJEE, Rabindranath
hal.structure.identifierGroupe d'Etude de la Matière Condensée [GEMAC]
dc.contributor.authorLINARES, Jorge
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorBALDE, Cherif
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorDESPLANCHES, Cédric
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorLETARD, Jean-François
hal.structure.identifierInstitut de Physique de Rennes [IPR]
dc.contributor.authorCOLLET, Eric
hal.structure.identifierInstitut de Physique de Rennes [IPR]
dc.contributor.authorTOUPET, Loic
hal.structure.identifierInstituto de Ciencia de Materiales de Aragón [Saragoza, España] [ICMA-CSIC]
dc.contributor.authorCASTRO, Miguel
hal.structure.identifierGroupe d'Etude de la Matière Condensée [GEMAC]
dc.contributor.authorVARRET, Francois
dc.date.issued2008
dc.identifier.issn0020-1669
dc.description.abstractEnThe title compound [FeII(L)2][ClO4]2·C7H8 (L = 2-[3-(2′-pyridyl)pyrazol-1-ylmethyl]pyridine) has been isolated while attempting to grow single crystals of the spin-transition (continuous-type) compound [FeII(L)2][ClO4]2, published earlier (Dalton Trans. 2003, 3392−3397). Magnetic susceptibility measurements, as well as Mössbauer and calorimetric investigations on polycrystalline samples of [Fe(L)2][ClO4]2·C7H8 revealed the occurrence of an abrupt HS (5T2) ↔ LS (1A1) transition with steep and narrow (2 K) hysteresis at ~232 K. The photomagnetic properties exhibit features typical for a broad distribution of activation energies, with relaxation curves in the shape of stretched exponentials. We performed a crystal structure determination of the compound at 120, 240, and 270 K. A noteworthy temperature-dependent behavior of the structural parameters was observed, in terms of disorder of both the anions and solvent molecules, leading to a strong thermal dependence of the strength and dimensionality of the interaction network. Additional data were obtained by diffuse reflectance measurements. We model and discuss the antagonistic effects of interactions and disorder by using a two-level cooperative mean-field approach which includes a distribution of barrier energies at the microscopic scale.
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.subject.enOrganic compouds
dc.subject.enInorganic compounds
dc.subject.enSpin transition
dc.subject.enPhysical properties
dc.title.enTemperature-dependent interactions and disorder in the spin-transition compound [FeII(L)2][ClO4]2·C7H8 through structural, calorimetric, cagnetic, photomagnetic, and diffuse reflectance investigations
dc.typeArticle de revue
dc.identifier.doi10.1021/ic8002977
dc.subject.halChimie/Matériaux
dc.subject.halChimie/Chimie de coordination
dc.subject.halChimie/Chimie organique
dc.subject.halChimie/Chimie inorganique
bordeaux.journalInorganic Chemistry
bordeaux.page7577–7587
bordeaux.volume47
bordeaux.issue17
bordeaux.peerReviewedoui
hal.identifierhal-00320978
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00320978v1
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