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Structure, magnetism and photomagnetism of mixed-ligand tris(pyrazolyl)methane iron(II) spin crossover compounds

hal.structure.identifierSchool of Chemistry
dc.contributor.authorMOUBARAKI, Boujemaa
hal.structure.identifierSchool of Chemistry
dc.contributor.authorLEITA, Ben A.
hal.structure.identifierSchool of Chemistry
dc.contributor.authorHALDER, Gregory J.
hal.structure.identifierSchool of Chemistry
dc.contributor.authorBATTEN, Stuart R.
hal.structure.identifierSchool of Chemistry
dc.contributor.authorJENSEN, Paul
hal.structure.identifierSchool of Chemistry
dc.contributor.authorSMITH, Jonathan P.
hal.structure.identifierSchool of Physics
dc.contributor.authorCASHION, John D.
hal.structure.identifierSchool of Chemistry
dc.contributor.authorKEPERT, Cameron J.
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorLÉTARD, Jean-François
hal.structure.identifierSchool of Chemistry
dc.contributor.authorMURRAY, Keith S.
dc.date.issued2007
dc.identifier.issn1477-9226
dc.description.abstractEnA range of bis-facial tridentate chelate complexes of type [Fe((R-pz)3CH)((3,5-Me2pz)3CH)](BF4)2 has been characterised that contain two different tris-pyrazolylmethane ligands, with variations in R being H (complex 1 crystallised as polymorphs 1a and 1b) and 4-Me (2), as well as R = H with a CH2OH arm off the methane carbon (3). A tris(pyridyl)methane analogue is also described (4). The tris(3,5-dimethylpyrazolyl)methane co-ligand (3,5-Me2pz), and the BF4– counterion, are constant throughout. The spin-crossover properties of these Fe(II) d6 compounds have been probed in detail by variable temperature magnetic, Mössbauer spectral and crystallographic methods. The effects of distortions from octahedral symmetry around the Fe(II) centres, of crystal solvate molecules (1.5 MeCN in 2 and 2 MeCN in 3) and of supramolecular/crystal packing, are discussed. In the case of 1, subtle twisting of pyrazole rings occurs, as a function of temperature, that has a greater effect upon the relative positions of the Fe(II) chelate molecules in polymorph 1b than in polymorph 1a; this is thought to drive the cooperativity differences observed in the magnetism of the polymorphs...
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.subject.enSpin crossover
dc.subject.enPhotomagnetism
dc.subject.enTris(pyrazol)methane
dc.subject.enIron(II)
dc.title.enStructure, magnetism and photomagnetism of mixed-ligand tris(pyrazolyl)methane iron(II) spin crossover compounds
dc.typeArticle de revue
dc.identifier.doi10.1039/b708773j
dc.subject.halChimie/Matériaux
bordeaux.journalDalton Transactions
bordeaux.page4413-4426
bordeaux.issue39
bordeaux.peerReviewedoui
hal.identifierhal-00177163
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00177163v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Dalton%20Transactions&rft.date=2007&rft.issue=39&rft.spage=4413-4426&rft.epage=4413-4426&rft.eissn=1477-9226&rft.issn=1477-9226&rft.au=MOUBARAKI,%20Boujemaa&LEITA,%20Ben%20A.&HALDER,%20Gregory%20J.&BATTEN,%20Stuart%20R.&JENSEN,%20Paul&rft.genre=article


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