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Magnetic bistability in macrocycle-based FeII spin-crossover complexes : counter ion and solvent effects

hal.structure.identifierChimie, Electrochimie Moléculaires et Chimie Analytique [CEMCA]
dc.contributor.authorMILIN, Eric
hal.structure.identifierChimie, Electrochimie Moléculaires et Chimie Analytique [CEMCA]
dc.contributor.authorBENAICHA, Bouabdellah
hal.structure.identifierChimie, Electrochimie Moléculaires et Chimie Analytique [CEMCA]
dc.contributor.authorEL HAJI, Fatima
hal.structure.identifierChimie, Electrochimie Moléculaires et Chimie Analytique [CEMCA]
dc.contributor.authorPATINEC, Véronique
hal.structure.identifierChimie, Electrochimie Moléculaires et Chimie Analytique [CEMCA]
dc.contributor.authorTRIKI, Smail
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorMARCHIVIE, Mathieu
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
dc.date.issued2016
dc.identifier.issn1434-1948
dc.description.abstractEnTwo new iron(II) complexes of formula [Fe(L2)](tcm)2·2H2O (1) and [Fe(L2)][Ni(CN)4]·H2O (2) {L2 = 1,8-bis(2′-pyridylmethyl)-1,4,8,11-tetraazacyclotetradecane; tcm– = [C(CN)3]– = tricyanomethanide anion} have been synthesized and characterized by X-ray diffraction and magnetic measurements and compared with the previously described compound of the same series [Fe(L2)](BF4)2·H2O (3). The crystal structures of the three compounds show discrete iron(II) complexes in which the FeII ions adopt distorted FeN6 octahedral geometries. A hydrogen-bonding network involving the water molecules and the different counter ions, tcm– in 1 and [Ni(CN)4]2– in 2, leads to chains for both compounds whereas compound 3 reveals no significant intermolecular contacts. For 1, the magnetic measurements show an abrupt and incomplete high-spin→low-spin (HS→LS) spin transition (ST) with a hysteresis of 9 K (T1/2down = 136 K; T1/2up = 145 K) that is also optically observed. Compound 2 presents slightly weaker intermolecular contacts and shows an abrupt ST at 85 K without hysteretic behaviour. Finally, compound 3, in which the FeII complex is well isolated, exhibits a gradual spin transition centred at 150 K. Detailed X-ray diffraction studies performed at various temperatures (293–120 K) show strong modifications of the iron coordination sphere in 1 and 3, in agreement with the presence of a ST in this temperature range in both complexes.
dc.description.sponsorshipBistabilité magnétique dans de nouveaux systèmes moléculaires à base de ligands anioniques pontants - ANR-12-BS07-0030
dc.language.isoen
dc.publisherWiley-VCH Verlag
dc.subject.enMacrocyclic ligands · N ligands · Iron · Spin crossover · Magnetic properties
dc.title.enMagnetic bistability in macrocycle-based FeII spin-crossover complexes : counter ion and solvent effects
dc.typeArticle de revue
dc.identifier.doi10.1002/ejic.201600660
dc.subject.halChimie/Matériaux
bordeaux.journalEuropean Journal of Inorganic Chemistry
bordeaux.page5305-5314
bordeaux.issue34
bordeaux.peerReviewedoui
hal.identifierhal-01432214
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01432214v1
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