Cooperative iron(II) spin crossover complexes with N4O2 coordination sphere
| 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 | Department of Chemistry and Biochemistry | |
| dc.contributor.author | WEIGAND, Jan | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | CARBONERA, Chiara | |
| 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 | 0020-1669 | |
| dc.description.abstractEn | Two new spin crossover complexes [FeL(py)2] (1) and [FeL(DMAP)2] (2) with L being a tetradentate N2O22- coordinating Schiff-base-like ligand [([3,3']-[1,2-phenylenebis(iminomethylidyne)]bis(2,4-pentanedionato)(2-)-N,N',O2,O2'], py = pyridine and DMAP = p-dimethylaminopyridine have been investigated using temperature-dependent susceptibility and thermogravimetric and photomagnetic measurements as well as Mössbauer spectroscopy and X-ray structure analysis. Both complexes show a cooperative spin transition with an approximately 9 K wide thermal hysteresis loop in the case of 2 (T1/2 = 183 K and T1/2 = 174 K) and an approximately 2 K wide thermal hysteresis loop in the case of the pyridine diadduct 1 (T1/2 = 191 K and T1/2 = 189 K). The spin transition was additionally followed by different temperature-scanning calorimetry and Mössbauer spectroscopy for 2, and a good agreement for the transition temperatures obtained with the different methods was found. Results from X-ray structure analysis indicate that the cooperative interactions are due to elastic interactions in both compounds. They are more pronounced in the case of 2 with very short intermolecular iron-iron distances of 7.2 Å and several intense C-C contacts. The change of the spin state at the iron center is accompanied by a change of the O-Fe-O angle, the so-called bit of the equatorial ligand, from 108 in the high-spin state to 90 in the low-spin state. The reflectivity measurements of both compounds give at low temperature indication that at the sample surface the light-induced excited spin state trapping (LIESST) effect occurs. In bulk condition using a SQUID magnetometer the complex 2 displays some photomagnetic properties with an photoexcitation level of 60% and a T(LIESST) value of 53 K. | |
| dc.language.iso | en | |
| dc.publisher | American Chemical Society | |
| dc.subject.en | Inorganic compounds | |
| dc.subject.en | N4O2 | |
| dc.subject.en | Spin crossover | |
| dc.subject.en | Sphere | |
| dc.subject.en | Iron(II) | |
| dc.title.en | Cooperative iron(II) spin crossover complexes with N4O2 coordination sphere | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1021/ic070067o | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Inorganic Chemistry | |
| bordeaux.page | 487-496 | |
| bordeaux.volume | 47 | |
| bordeaux.issue | 2 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00258997 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00258997v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Inorganic%20Chemistry&rft.date=2008&rft.volume=47&rft.issue=2&rft.spage=487-496&rft.epage=487-496&rft.eissn=0020-1669&rft.issn=0020-1669&rft.au=WEBER,%20Birgit&KAPS,%20Eike&WEIGAND,%20Jan&CARBONERA,%20Chiara&L%C3%89TARD,%20Jean-Fran%C3%A7ois&rft.genre=article |
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