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Locking and Unlocking the Molecular Spin Crossover Transition

hal.structure.identifierDepartment of Physics and Astronomy [Lincoln]
dc.contributor.authorCOSTA, Paulo S.
hal.structure.identifierDepartment of Chemistry
dc.contributor.authorMILLER, Daniel P.
hal.structure.identifierLawrence Berkeley National Laboratory [Berkeley] [LBNL]
dc.contributor.authorN'DIAYE, Alpha T.
hal.structure.identifierDepartment of Physics and Astronomy [Lincoln]
dc.contributor.authorDOWBEN, Peter A.
hal.structure.identifierDepartment of Physics and Astronomy [Lincoln]
dc.contributor.authorZHANG, Xin
dc.contributor.authorCOSTA, Paulo
hal.structure.identifierDepartment of Theoretical Chemistry - Faculty of Chemistry
dc.contributor.authorHOOPER, James
dc.contributor.authorMILLER, Daniel
dc.contributor.authorN'DIAYE, Alpha
hal.structure.identifierDepartment of Physics and Astronomy [Lincoln]
dc.contributor.authorBENIWAL, Sumit
hal.structure.identifierDepartment of Physics and Astronomy [Lincoln]
dc.contributor.authorJIANG, Xuanyuan
hal.structure.identifierDepartment of Physics and Astronomy [Lincoln]
dc.contributor.authorYIN, Yuewei
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorROSA, Patrick
hal.structure.identifierLaboratoire de Chimie de Coordination Organique
dc.contributor.authorROUTABOUL, Lucie
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGONIDEC, Mathieu
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorPOGGINI, Lorenzo
hal.structure.identifierLaboratoire de Chimie de Coordination Organique
dc.contributor.authorBRAUNSTEIN, Pierre
hal.structure.identifierInstitut de Physique et Chimie des Matériaux de Strasbourg [IPCMS]
dc.contributor.authorDOUDIN, Bernard
hal.structure.identifierDepartment of Physics and Astronomy [Lincoln]
dc.contributor.authorXU, Xiaoshan
hal.structure.identifierPhysikalisches Institut [Bayreuth]
dc.contributor.authorENDERS, Axel
hal.structure.identifierDepartment of Chemistry
dc.contributor.authorZUREK, Eva
dc.contributor.authorDOWBEN, Peter
dc.date.issued2017-10
dc.identifier.issn0935-9648
dc.description.abstractEnThe Fe(II) spin crossover complex [Fe{H2 B(pz)2 }2 (bipy)] (pz = pyrazol-1-yl, bipy = 2,2'-bipyridine) can be locked in a largely low-spin-state configuration over a temperature range that includes temperatures well above the thermal spin crossover temperature of 160 K. This locking of the spin state is achieved for nanometer thin films of this complex in two distinct ways: through substrate interactions with dielectric substrates such as SiO2 and Al2 O3 , or in powder samples by mixing with the strongly dipolar zwitterionic p-benzoquinonemonoimine C6 H2 (-⋯ NH2 )2 (-⋯ O)2 . Remarkably, it is found in both cases that incident X-ray fluences then restore the [Fe{H2 B(pz)2 }2 (bipy)] moiety to an electronic state characteristic of the high spin state at temperatures of 200 K to above room temperature; that is, well above the spin crossover transition temperature for the pristine powder, and well above the temperatures characteristic of light- or X-ray-induced excited-spin-state trapping. Heating slightly above room temperature allows the initial locked state to be restored. These findings, supported by theory, show how the spin crossover transition can be manipulated reversibly around room temperature by appropriate design of the electrostatic and chemical environment.
dc.description.sponsorshipPar-delà les frontières, l'Université de Strasbourg
dc.description.sponsorshipInitiative d'excellence de l'Université de Bordeaux
dc.language.isoen
dc.publisherWiley-VCH Verlag
dc.subject.enzwitterionic complexes
dc.subject.enspin-state locking
dc.subject.enX-ray excited spin states
dc.subject.enspin crossover transition
dc.subject.ensubstrate interactions
dc.subject.enzwitterionic complexes
dc.title.enLocking and Unlocking the Molecular Spin Crossover Transition
dc.typeArticle de revue
dc.identifier.doi10.1002/adma.201702257
dc.subject.halChimie/Matériaux
bordeaux.journalAdvanced Materials
bordeaux.page1702257 (10 p.)
bordeaux.volume29
bordeaux.issue39
bordeaux.peerReviewedoui
hal.identifierhal-01623663
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-01623663v1
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