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Stimuli responsive hybrid magnets : tuning the photoinduced spin-crossover in Fe(III) complexes inserted into layered magnets

hal.structure.identifierInstituto de Ciencia Molecular [ICMol]
dc.contributor.authorCLEMENTE-LEÓN, Miguel
hal.structure.identifierInstituto de Ciencia Molecular [ICMol]
dc.contributor.authorCORONADO, Eugenio
hal.structure.identifierInstituto de Ciencia Molecular [ICMol]
dc.contributor.authorLÓPEZ-JORDÀ, Maurici
hal.structure.identifierInstituto Superior Técnico [IST/ITN]
dc.contributor.authorWAERENBORGH, João C.
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.authorWANG, Hongfeng
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorLÉTARD, Jean-François
hal.structure.identifierDepartment of Physical Chemistry, University of Geneva
dc.contributor.authorHAUSER, Andreas
hal.structure.identifierInstitut de Chimie Moléculaire et des Matériaux d'Orsay [ICMMO]
dc.contributor.authorTISSOT, Antoine
dc.date.issued2013-06-12
dc.identifier.issn0002-7863
dc.description.abstractEnThe insertion of a [Fe(sal2-trien)](+) complex cation into a 2D oxalate network in the presence of different solvents results in a family of hybrid magnets with coexistence of magnetic ordering and photoinduced spin-crossover (LIESST effect) in compounds [Fe(III)(sal2-trien)][Mn(II)Cr(III)(ox)3]*CHCl3 (1*CHCl3), [Fe(III)(sal2-trien)][Mn(II)Cr(III)(ox)3]*CHBr3 (1*CHBr3), and [Fe(III)(sal2-trien)][Mn(II)Cr(III)(ox)3]*CH2Br2 (1*CH2Br2). The three compounds crystallize in a 2D honeycomb anionic layer formed by Mn(II) and Cr(III) ions linked through oxalate ligands and a layer of [Fe(sal2-trien)](+) complexes and solvent molecules (CHCl3, CHBr3, or CH2Br2) intercalated between the 2D oxalate network. The magnetic properties and Mössbauer spectroscopy indicate that they undergo long-range ferromagnetic ordering at 5.6 K and a spin crossover of the intercalated [Fe(sal2-trien)](+) complexes at different temperatures T1/2. The three compounds present a LIESST effect with a relaxation temperature TLIESST inversely proportional to T1/2. The isostructural paramagnetic compound, [Fe(III)(sal2-trien)][Zn(II)Cr(III)(ox)3]*CH2Cl2 (2*CH2Cl2) was also prepared. This compound presents a partial spin crossover of the inserted Fe(III) complex as well as a LIESST effect. Finally, spectroscopic characterization of the Fe(III) doped compound [Ga0.99Fe0.01(sal2trien)][Mn(II)Cr(III)(ox)3]*CH2Cl2 (3*CH2Cl2) shows a gradual and complete thermal spin crossover and a LIESST effect on the isolated Fe(III) complexes. This result confirms that cooperativity is not a necessary condition to observe the LIESST effect in an Fe(III) compound.
dc.language.isoen
dc.publisherAmerican Chemical Society
dc.subject.enComplex cation
dc.subject.enOxalate network
dc.subject.enSolvents
dc.subject.enHybrid magnets
dc.subject.enMagnetism
dc.subject.enFe(III)
dc.title.enStimuli responsive hybrid magnets : tuning the photoinduced spin-crossover in Fe(III) complexes inserted into layered magnets
dc.typeArticle de revue
dc.identifier.doi10.1021/ja402674x
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of the American Chemical Society
bordeaux.page8655-8667
bordeaux.volume135
bordeaux.issue23
bordeaux.peerReviewedoui
hal.identifierhal-00840683
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00840683v1
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