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Co(II) molecular complexes as a reference for the spin crossover in Fe(II) analogues

hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorGUIONNEAU, Philippe
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorMARCHIVIE, Mathieu
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorBRAVIC, Georges
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorLÉTARD, Jean-François
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCHASSEAU, Daniel
dc.date.issued2002
dc.identifier.issn0959-9428
dc.description.abstractEnThe crystal structures of a series of cobalt(II) molecular complexes, [Co(PM-L)2(NCS)2] [PM = N-2-pyridylmethylene, L = 4-(aminobiphenyl) or 4-(phenylethynyl)aniline], are investigated and compared to the analogous iron(II) complexes, [Fe(PM-L)2(NCS)2], already known in the literature. At room temperature, the Co(II) complexes prove to be isostructural with the iron(II) complexes. An interesting point is that the iron complexes, unlike the cobalt complexes, undergo a spin crossover at low temperature. Hence, a comparison of the temperature dependence of the structural properties of the Co(II) and the Fe(II) complexes underlines some structural features of the spin crossover. Comparative deformation of the lattices and thermal expansion tensors are first discussed. Then, new parameters to estimate the distortion and the contraction at the spin crossover of the FeN6 coordination sphere are presented, thereby allowing the estimation of the reduction of the volume of the octahedron to around 3 Å3 (25%). As well, comparative discussions on the intermolecular contact modifications with temperature are proposed. In the above considerations the cobalt series is therefore used as a reference to distinguish between the effects of the spin crossover and the purely thermal effects.
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.subject.enCrystal structure
dc.subject.enCobalt
dc.subject.enIron
dc.subject.enMolecular complexes
dc.subject.enSpin crossover
dc.title.enCo(II) molecular complexes as a reference for the spin crossover in Fe(II) analogues
dc.typeArticle de revue
dc.identifier.doi10.1039/B202610D
dc.subject.halChimie/Matériaux
bordeaux.journalJournal of Materials Chemistry
bordeaux.page2546-2551
bordeaux.volume12
bordeaux.issue8
bordeaux.peerReviewedoui
hal.identifierhal-00719770
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00719770v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Materials%20Chemistry&rft.date=2002&rft.volume=12&rft.issue=8&rft.spage=2546-2551&rft.epage=2546-2551&rft.eissn=0959-9428&rft.issn=0959-9428&rft.au=GUIONNEAU,%20Philippe&MARCHIVIE,%20Mathieu&BRAVIC,%20Georges&L%C3%89TARD,%20Jean-Fran%C3%A7ois&CHASSEAU,%20Daniel&rft.genre=article


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