Afficher la notice abrégée

Spin-transition in [Fe<sup>II</sup>(L<sup>5</sup>)<sub>2</sub>][ClO<sub>4</sub>]<sub>2</sub> [L<sup>5</sup> = 2-[3-(2'-pyridyl)pyrazol-1-ylmethyl](1-methylimidazole)]: a further example of coexistence of features typical for disorder and cooperativity

hal.structure.identifierGroupe d'Etude de la Matière Condensée [GEMAC]
hal.structure.identifierDepartment of Chemistry [Kanpur] [IIT Kanpur]
dc.contributor.authorMISHRA, Vibha
hal.structure.identifierGroupe d'Etude de la Matière Condensée [GEMAC]
hal.structure.identifierDepartment of Chemistry [Kanpur] [IIT Kanpur]
dc.contributor.authorMISHRA, Haritoshi
hal.structure.identifierDepartment of Chemistry [Kanpur] [IIT Kanpur]
dc.contributor.authorMUKHERJEE, Rabindranath
hal.structure.identifierGroupe d'Etude de la Matière Condensée [GEMAC]
dc.contributor.authorCODJOVI, Epiphane
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.authorLETARD, Jean-François
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.authorBALDE, Cherif
hal.structure.identifierDepartment of Solid State and Theoretical Physics
dc.contributor.authorENACHESCU, Cristian
hal.structure.identifierGroupe d'Etude de la Matière Condensée [GEMAC]
dc.contributor.authorVARRET, Francois
dc.date.issued2009
dc.identifier.issn1477-9226
dc.description.abstractEnAn iron(II) complex [Fe(L<sup>5</sup>)<sub>2</sub>][ClO<sub>4</sub>]<sub>2</sub> of a new nonplanar tridentate ligand [L<sup>5</sup> = 2-[3-(2-pyridyl)pyrazol-1-ylmethyl](1-methylimidazole)] has been synthesized and its spin-transition properties have been investigated. X-ray structural analysis of the solvated compound [Fe(L<sup>5</sup>)<sub>2</sub>][ClO<sub>4</sub>]<sub>2</sub>·CH<sub>3</sub>CN at 100 K and at 298 K revealed a mononuclear Fe<sup>II</sup>N<sub>6</sub> pseudooctahedron with the tridentate ligand in the meridional coordination mode. Magnetic susceptibility measurements revealed LS (<sup>1</sup>A<sub>1</sub>) HS (<sup>5</sup>T<sub>2</sub>) transition starting above room temperature and remained incomplete even up to 350 K, however providing evidence for the hysteretic behaviour of the transition. Photo-magnetic measurements using a 532 nm laser revealed incomplete light-induced excited spin-state trapping (LIESST). Relaxation curves in the dark exhibited a stretched exponential shape, typical for broad distributions of relaxation times. The complete photo-magnetic data were modelled using a non-cooperative master equation including a tunnelling process with distributed parameters and accounting for the bulk absorption of light. We also measured the diffuse reflectance properties, with detailed investigation of the absorption spectra and discussed the obtained features with respect to structural properties, including the suggested presence of disorder.
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.title.enSpin-transition in [Fe<sup>II</sup>(L<sup>5</sup>)<sub>2</sub>][ClO<sub>4</sub>]<sub>2</sub> [L<sup>5</sup> = 2-[3-(2'-pyridyl)pyrazol-1-ylmethyl](1-methylimidazole)]: a further example of coexistence of features typical for disorder and cooperativity
dc.typeArticle de revue
dc.identifier.doi10.1039/b901397k
dc.subject.halChimie/Matériaux
bordeaux.journalDalton Transactions
bordeaux.page7462-7472
bordeaux.issue36
bordeaux.peerReviewedoui
hal.identifierhal-00423814
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00423814v1
bordeaux.COinSctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.jtitle=Dalton%20Transactions&amp;rft.date=2009&amp;rft.issue=36&amp;rft.spage=7462-7472&amp;rft.epage=7462-7472&amp;rft.eissn=1477-9226&amp;rft.issn=1477-9226&amp;rft.au=MISHRA,%20Vibha&amp;MISHRA,%20Haritoshi&amp;MUKHERJEE,%20Rabindranath&amp;CODJOVI,%20Epiphane&amp;LINARES,%20Jorge&amp;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