Multimetastability, phototrapping, and thermal trapping of a metastable commensurate superstructure in a FeII spin-crossover compound
| hal.structure.identifier | Cristallographie, Résonance Magnétique et Modélisations [CRM2] | |
| dc.contributor.author | PILLET, Sébastien | |
| hal.structure.identifier | Cristallographie, Résonance Magnétique et Modélisations [CRM2] | |
| dc.contributor.author | BENDEIF, El-Eulmi | |
| hal.structure.identifier | Leiden Institute of Chemistry | |
| dc.contributor.author | BONNET, Sylvestre | |
| hal.structure.identifier | Department of Chemistry | |
| dc.contributor.author | SHEPHERD, Helena | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | GUIONNEAU, Philippe | |
| dc.date.issued | 2012 | |
| dc.identifier.issn | 1098-0121 | |
| dc.description.abstractEn | The photoinduced switching and subsequent relaxation regime at cryogenic temperatures of the two-step spin-crossover compound [Fe(bapbpy)(NCS)2] has been investigated by time-dependent photocrystallography. Upon photoexcitation from the low-spin (LS) state, a direct population of the metastable high-spin (HS) state occurs, without involving any intermediate structural state. The relaxation from the metastable HS state in isothermal conditions at 40 K proceeds in two successive steps associated with two symmetry breaking processes. The first step corresponds to the cooperative transformation to an intermediate superstructure, characterized by a long-range-ordered [HS-LS-LS] motif coupled to a commensurate displacive modulation, and concomitant with a tripling of the c axis of the unit cell (C2/c space group). The stabilization of the intermediate state is driven by strong molecule-lattice coupling. In the second stage, the intermediate state undergoes a transformation twinning triggered by lattice strain towards the LS state. The two-step relaxation is reminiscent of the two-step thermal transition of [Fe(bapbpy)(NCS)2] and evidences multimetastability in the light-induced or relaxation regime. The long-range-ordered [HS-LS-LS] superstructure has also been trapped by rapid quench cooling to very low temperature, and has been structurally characterized. | |
| dc.language.iso | en | |
| dc.publisher | American Physical Society | |
| dc.subject.en | Photoinduced switching | |
| dc.subject.en | Relaxation | |
| dc.subject.en | Cryogenic temperatures | |
| dc.subject.en | Spin-crossover compound | |
| dc.title.en | Multimetastability, phototrapping, and thermal trapping of a metastable commensurate superstructure in a FeII spin-crossover compound | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1103/PhysRevB.86.064106 | |
| dc.subject.hal | Chimie/Matériaux | |
| dc.subject.hal | Chimie/Chimie de coordination | |
| bordeaux.journal | Physical Review B: Condensed Matter and Materials Physics (1998-2015) | |
| bordeaux.page | 064106 | |
| bordeaux.volume | 86 | |
| bordeaux.issue | 6 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00731243 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00731243v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Physical%20Review%20B:%20Condensed%20Matter%20and%20Materials%20Physics%20(1998-2015)&rft.date=2012&rft.volume=86&rft.issue=6&rft.spage=064106&rft.epage=064106&rft.eissn=1098-0121&rft.issn=1098-0121&rft.au=PILLET,%20S%C3%A9bastien&BENDEIF,%20El-Eulmi&BONNET,%20Sylvestre&SHEPHERD,%20Helena&GUIONNEAU,%20Philippe&rft.genre=article |
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