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Photomagnetism of a sym-cis-Dithiocyanato Iron(II) Complex with a Tetradentate N,N'-Bis(2-pyridylmethyl)1,2-ethanediamine Ligand.

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]
hal.structure.identifierDepartment of Physics
dc.contributor.authorASTHANA, Saket
hal.structure.identifierDepartment of Chemistry
dc.contributor.authorSHEPHERD, Helena
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGUIONNEAU, Philippe
hal.structure.identifierDepartment of Chemistry
dc.contributor.authorGOETA, Andrés E.
hal.structure.identifierDepartment of Chemistry
dc.contributor.authorSUEMURA, Naohiko
hal.structure.identifierDepartment of Chemistry
dc.contributor.authorISHIKAWA, Ryuta
hal.structure.identifierDepartment of Chemistry
dc.contributor.authorKAIZAKI, Sumio
dc.date.issued2012
dc.identifier.issn0947-6539
dc.description.abstractEnA comprehensive study of the magnetic and photomagnetic behaviors of cis-[Fe(picen)(NCS)(2) ] (picen=N,N'-bis(2-pyridylmethyl)1,2-ethanediamine) was carried out. The spin-equilibration was extremely slow in the vicinity of the thermal spin-transition. When the cooling speed was slower than 0.1 K min(-1) , this complex was characterized by an abrupt thermal spin-transition at about 70 K. Measurement of the kinetics in the range 60-70 K was performed to approach the quasi-static hysteresis loop. At low temperatures, the metastable HS state was quenched by a rapid freezing process and the critical T(TIESST) temperature, which was associated with the thermally induced excited spin-state-trapping (TIESST) effect, was measured. At 10 K, this complex also exhibited the well-known light-induced excited spin-state-trapping (LIESST) effect and the T(LIESST) temperature was determined. The kinetics of the metastable HS states, which were generated from the freezing effect and from the light-induced excitation, was studied. Single-crystal X-ray diffraction as a function of speed-cooling and light conditions at 30 K revealed the mechanism of the spin-crossover in this complex as well as some direct relationships between its structural properties and its spin state. This spin-crossover (SCO) material represents a fascinating example in which the metastability of the HS state is in close vicinity to the thermal spin-transition region. Moreover, it is a beautiful example of a complex in which the metastable HS states can be generated, and then compared, either by the freezing effect or by the LIESST effect.
dc.language.isoen
dc.publisherWiley-VCH Verlag
dc.subject.enIron
dc.subject.enLigand effects
dc.subject.enPhotomagnetism
dc.subject.enSpin crossover
dc.subject.enX-ray diffraction
dc.title.enPhotomagnetism of a sym-cis-Dithiocyanato Iron(II) Complex with a Tetradentate N,N'-Bis(2-pyridylmethyl)1,2-ethanediamine Ligand.
dc.typeArticle de revue
dc.identifier.doi10.1002/chem.201102637
dc.subject.halChimie/Matériaux
bordeaux.journalChemistry - A European Journal
bordeaux.page5924-5934
bordeaux.volume18
bordeaux.issue19
bordeaux.peerReviewedoui
hal.identifierhal-00700510
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00700510v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Chemistry%20-%20A%20European%20Journal&rft.date=2012&rft.volume=18&rft.issue=19&rft.spage=5924-5934&rft.epage=5924-5934&rft.eissn=0947-6539&rft.issn=0947-6539&rft.au=L%C3%89TARD,%20Jean-Fran%C3%A7ois&ASTHANA,%20Saket&SHEPHERD,%20Helena&GUIONNEAU,%20Philippe&GOETA,%20Andr%C3%A9s%20E.&rft.genre=article


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