Afficher la notice abrégée

Cyanocarbanion-based spin-crossover materials: photocrystallographic and photomagnetic studies of a new iron(II) neutral chain

hal.structure.identifierChimie, Electrochimie Moléculaires et Chimie Analytique [CEMCA]
dc.contributor.authorDUPOUY, Gaelle
hal.structure.identifierChimie, Electrochimie Moléculaires et Chimie Analytique [CEMCA]
dc.contributor.authorTRIKI, Smail
hal.structure.identifierChimie, Electrochimie Moléculaires et Chimie Analytique [CEMCA]
dc.contributor.authorMARCHIVIE, Mathieu
hal.structure.identifierChimie, Electrochimie Moléculaires et Chimie Analytique [CEMCA]
dc.contributor.authorCOSQUER, Nathalie
hal.structure.identifierInstituto de Ciencia Molecular [ICMol]
dc.contributor.authorGÓMEZ-GARCÍA, Carlos J.
hal.structure.identifierCristallographie, Résonance Magnétique et Modélisations [CRM2]
dc.contributor.authorPILLET, Sébastien
hal.structure.identifierCristallographie, Résonance Magnétique et Modélisations [CRM2]
dc.contributor.authorBENDEIF, El-Eulmi
hal.structure.identifierCristallographie, Résonance Magnétique et Modélisations [CRM2]
dc.contributor.authorLECOMTE, Claude
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorASTHANA, Saket
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorLÉTARD, Jean-François
dc.date.issued2010
dc.identifier.issn0020-1669
dc.description.abstractEnA new iron(II) chain of formula [Fe(abpt)(2)(tcpd)] [1; (tcpd)(2-) = [C(10)N(6)](2-) = (C[C(CN)(2)](3))(2-) = 2-dicyanomethylene-1,1,3,3-tetracyanopropanediide anion, abpt = 4-amino-3,5-bis(pyridin-2-yl)-1,2,4-triazole] has been synthesized and characterized by IR spectroscopy, detailed variable-temperature single-crystal X-ray diffraction, magnetic and photomagnetic measurements. The crystal structure determination of 1 reveals a one-dimensional structural architecture in which the (tcpd)(2-) cyanocarbanion acts as a μ(2)-bridging ligand and the two abpt molecules act as chelating ligands. Detailed X-ray diffraction studies as a function of the temperature (293-10 K) showed a strong modification of the iron coordination sphere, whose characteristics are in agreement with the presence of a spin-crossover transition from high spin (HS) to low spin (LS) in 1. The average Fe-N distances at room temperature, at 10 K following a flash cooling, and at 10 K after subsequent HS-to-LS relaxation are in the range expected for 100%, 50%, and 25% fractions of HS Fe(II), respectively. These observations are consistent with the presence of ca. 25% residual HS species at low temperatures, as derived from the magnetic data. The signature of a photoinduced metastable HS state in 1 has been detected by performing coupled photomagnetic and photocrystallographic analyses. The limiting T(LIESST) value associated with the light-induced excited-spin-state trapping effect was derived as 35 K, in good agreement with the thermal dependence of the unit cell volume upon irradiation. Kinetic studies governing the photoinduced HS/LS process have been recorded at different temperatures; a reverse-LIESST effect has been evidenced at 10 K as a reduction of the residual HS fraction by irradiating the sample at 830 nm.
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.title.enCyanocarbanion-based spin-crossover materials: photocrystallographic and photomagnetic studies of a new iron(II) neutral chain
dc.typeArticle de revue
dc.identifier.doi10.1021/ic101038z
dc.subject.halChimie/Matériaux
bordeaux.journalInorganic Chemistry
bordeaux.page9358-68
bordeaux.volume49
bordeaux.issue20
bordeaux.peerReviewedoui
hal.identifierhal-00545079
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00545079v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Inorganic%20Chemistry&rft.date=2010&rft.volume=49&rft.issue=20&rft.spage=9358-68&rft.epage=9358-68&rft.eissn=0020-1669&rft.issn=0020-1669&rft.au=DUPOUY,%20Gaelle&TRIKI,%20Smail&MARCHIVIE,%20Mathieu&COSQUER,%20Nathalie&G%C3%93MEZ-GARC%C3%8DA,%20Carlos%20J.&rft.genre=article


Fichier(s) constituant ce document

FichiersTailleFormatVue

Il n'y a pas de fichiers associés à ce document.

Ce document figure dans la(les) collection(s) suivante(s)

Afficher la notice abrégée