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Switchable heteroleptic mononuclear iron(II) complexes as versatile molecular building block

hal.structure.identifierLaboratoire de Chimie et Physique [LCPM]
dc.contributor.authorBALDÉ, Cherif
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorPARADIS, Nicolas
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.authorCHASTANET, Guillaume
dc.date.issued2018
dc.identifier.issn1434-1948
dc.description.abstractEnA series of photoswitchable precursors based on [Fe(NCX)2L(L′)2], where X = S or Se, L is a bidentate ligand (phenanthroline or bipyrimidine), and L′ a monodentate ligand such as a pyridine or picoline derivative, were synthesized and their spin crossover (SCO) properties investigated in detail. The thermal and light‐induced magnetic properties of a family of [Fe(NCS)2L(py)2] [py = pyridine and L = bipyrimidine (1) or phenanthroline (phen) (2)] is reported. The [Fe(NCX)2(phen)(L′)2] compounds were further explored by changing the counteranion from NCS– to NCSe– (3) or by replacing pyridine with 4‐picoline (4) or 4‐ethylpyridine (5). Complexes 1–4 exhibit thermal and light‐induced SCO, while 5 remains in the high‐spin state. The kinetics governing the photoinduced back‐conversion was investigated for compounds 2 and 4. Complex 2 exhibits LIESST relaxation kinetics involving strongly cooperative (sigmoidal) behavior, whereas complex 4 displays a stretched exponential shape, typical for broad distributions of relaxation times. These results are discussed on the basis of the steric hindrance due to bulkiness and the electronic influence of the substituent effects on the magnetic and photomagnetic properties of mononuclear iron(II) complexes.
dc.description.sponsorshipInitiative d'excellence de l'Université de Bordeaux - ANR-10-IDEX-0003
dc.description.sponsorshipEtude femtoseconde rayons X et optique de la dynamique ultrarapide de photocommutation de matériaux moléculaires magnétiques - ANR-13-BS04-0002
dc.language.isoen
dc.publisherWiley-VCH Verlag
dc.subject.enSpin crossover
dc.subject.enN ligands
dc.subject.enIron
dc.subject.enLigand effects
dc.subject.enMagnetic properties
dc.title.enSwitchable heteroleptic mononuclear iron(II) complexes as versatile molecular building block
dc.typeArticle de revue
dc.identifier.doi10.1002/ejic.201800053
dc.subject.halChimie/Chimie de coordination
bordeaux.journalEuropean Journal of Inorganic Chemistry
bordeaux.page2004-2010
bordeaux.volume2018
bordeaux.issue19
bordeaux.peerReviewedoui
hal.identifierhal-01798679
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01798679v1
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