Effect of the metal dilution on the thermal and light-induced spin transition in [FexMn1−x(bpp)2](NCSe)2: When T(LIESST) reaches T1/2 - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Inorganica Chimica Acta Année : 2008

Effect of the metal dilution on the thermal and light-induced spin transition in [FexMn1−x(bpp)2](NCSe)2: When T(LIESST) reaches T1/2

Résumé

The thermal and light-induced spin transition in [FexMn1−x(bpp)2](NCSe)2 (bpp = 2,6-bis(pyrazol-3-yl)pyridine) has been investigated by magnetic susceptibility, photomagnetism and diffuse reflectivity measurements. These complexes display a thermal spin transition and exhibit the light-induced excited spin state trapping (LIESST) effect at low temperature. For each mixed-crystal system, the thermal spin transition temperature, T1/2, and the relaxation temperature of the photo-induced high-spin state, T(LIESST), have been systematically determined. It appears that T1/2 decreases with the metal dilution while T(LIESST) remains unchanged, suggesting that the two interconversion processes are controlled by different factors; i.e. the photomagnetic properties are governed at the molecular scale and the thermal spin crossover regime is affected by both the ligand field and crystal packing effects. For highly metal-diluted complex with x < 0.2, it is found that when T1/2 reaches the T(LIESST), the complex remains HS on the whole range of temperature.

Domaines

Matériaux

Dates et versions

hal-00319917 , version 1 (09-09-2008)

Identifiants

Citer

Cherif Balde, Cédric Desplanches, Philipp Gutlich, Eric Freysz, Jean-François Létard. Effect of the metal dilution on the thermal and light-induced spin transition in [FexMn1−x(bpp)2](NCSe)2: When T(LIESST) reaches T1/2. Inorganica Chimica Acta, 2008, 361 (12-13), pp.3529-3533. ⟨10.1016/j.ica.2008.03.124⟩. ⟨hal-00319917⟩

Collections

CNRS ICMCB LOMA
79 Consultations
0 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More