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Synthesis and characterisation of two new iron(II) spin-crossover complexes with N4O2 coordination spheres - optimizing preconditions for cooperative interactions
| hal.structure.identifier | Department of Chemistry and Biochemistry | |
| dc.contributor.author | WEBER, Birgit | |
| hal.structure.identifier | Department of Chemistry and Biochemistry | |
| dc.contributor.author | KAPS, Eike | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | DESPLANCHES, Cédric | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | LÉTARD, Jean-François | |
| hal.structure.identifier | Department of Physics | |
| dc.contributor.author | ACHTERHOLD, Klaus | |
| hal.structure.identifier | Department of Physics | |
| dc.contributor.author | PARAK, Fritz G. | |
| dc.date.issued | 2008 | |
| dc.identifier.issn | 1434-1948 | |
| dc.description.abstractEn | Two new spin-crossover complexes, [FeL1(phpy)2] (1) and [FeL2(phpy)2](phpy) (2), with L1 and L2 being tetradentate N2O22--coordinating Schiff-base-like ligands {L1 = (E,E)-[diethyl 2,2-[1,2-phenylenebis(iminomethylidyne)]bis(3-oxobutanoato)(2-)-N,N,O3,O3], L2 = [(3,3)-[1,2-phenylenebis(iminomethylidyne)]bis(2,4-pentanedionato)(2-)-N,N,O2,O2]and phpy = 4-phenylpyridine} have been investigated using temperature-dependent susceptibility and photomagnetic measurements, as well as Mössbauer spectroscopy and X-ray structure analysis. Compound 1 shows a cooperative spin transition with a thermal hysteresis loop approximately 4 K wide (T1/2 = 232 K and T1/2 = 236 K). The spin transition of 2 is gradual with T1/2 290 K. Results from X-ray structure analysis indicate that the cooperative interactions are due to elastic interactions with several intense C-C contacts in the case of 1. The change of the spin state at the iron centre is accompanied by a change of the O-Fe-O angle, the so-called bite of the equatorial ligand, from 107° in the high-spin state to 89° in the low-spin state. Reflectivity measurements of 1 indicate that the Light-Induced Excited Spin State Trapping (LIESST) effect occurs at the sample surface at low temperatures. In the bulk solid, photomagnetic properties with a photoexcitation level of 30 % and a T(LIESST) value of 41 K are observed using a SQUID magnetometer. | |
| dc.language.iso | en | |
| dc.publisher | Wiley-VCH Verlag | |
| dc.title.en | Synthesis and characterisation of two new iron(II) spin-crossover complexes with N4O2 coordination spheres - optimizing preconditions for cooperative interactions | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1002/ejic.200800420 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | European Journal of Inorganic Chemistry | |
| bordeaux.page | 4891-4898 | |
| bordeaux.issue | 31 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00332990 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00332990v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=European%20Journal%20of%20Inorganic%20Chemistry&rft.date=2008&rft.issue=31&rft.spage=4891-4898&rft.epage=4891-4898&rft.eissn=1434-1948&rft.issn=1434-1948&rft.au=WEBER,%20Birgit&KAPS,%20Eike&DESPLANCHES,%20C%C3%A9dric&L%C3%89TARD,%20Jean-Fran%C3%A7ois&ACHTERHOLD,%20Klaus&rft.genre=article |
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