BALDE, Cherif; DESPLANCHES, Cédric; GUTLICH, Philipp; FREYSZ, Eric; LÉTARD, Jean-François

doi:10.1016/j.ica.2008.03.124

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BALDE, Cherif
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

DESPLANCHES, Cédric
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

GUTLICH, Philipp
Insitut für Anorganische und Analytische Chemie

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Ce document a été publié dans

Inorganica Chimica Acta. 2008, vol. 361, n° 12-13, p. 3529-3533

Elsevier

Résumé en anglais

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.< Réduire

Mots clés en anglais

Photomagnetism

Mots clés en italien

Coordination chemistry

Spin crossover

Metal dilution