Effect of metal dilution on the light-induced spin transition in [FexZn1-x(phen)2(NCS)2] (phen = 1,10-phenanthroline)

Cherif Baldé (1) , Cédric Desplanches (1) , Alain Wattiaux (1) , Philippe Guionneau (1) , Philipp Gütlich (2) , Jean-François Létard (1)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 Insitut für Anorganische und Analytische Chemie

The thermal and light-induced spin transitions in [FexZn1-x(phen)2(NCS)2] (phen = 1,10-phenantholine) have been investigated by magnetic susceptibility, photomagnetism and diffuse reflectivity measurements. These complexes display a thermal spin transition and undergo the light-induced excited spin state trapping (LIESST) effect at low temperatures. For each compound, 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. This behaviour is discussed on the basis of the kinetic study governing the photo-induced back conversion.

Mots clés: LIESST; Magnetic susceptibility; Photomagnetism; Diffuse reflectivity measurements; Metal; Chemical compounds

Domaines: Matériaux

Cherif Baldé, Cédric Desplanches, Alain Wattiaux, Philippe Guionneau, Philipp Gütlich, et al.. Effect of metal dilution on the light-induced spin transition in [FexZn1-x(phen)2(NCS)2] (phen = 1,10-phenanthroline). Dalton Transactions, 2008, 20, pp.2702-2707. ⟨10.1039/b800248g⟩. ⟨hal-00293412⟩