Influence of metal dilution on the light-induced spin transition in two 1D chain compounds: [FexZn1-x(btzp)3](BF 4)2 and [FexZn1-x(endi)3](BF4)2 {btzp = 1,2-bis(tetrazol-1-yl)propane and endi = 1,2-bis(tetrazol-1-yl)ethane}

Cherif Balde (1) , Cédric Desplanches (1) , C. Matthias Grunert (2) , Y. Wei (2) , Philipp Gutlich (2) , Jean-François Letard (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 [FexZn 1-x(btzp)3](BF4)2 and [Fe xZn1-x(endi)3](BF4)2 {btzp = 1,2-bis(tetrazol-1-yl)propane; endi = 1,2-bis(tetrazol-1-yl)ethane} chain compounds have been investigated by magnetic susceptibility, photomagnetism and diffuse reflectivity measurements. These compounds display a thermal spin transition and the Light-Induced Excited Spin State Trapping (LIESST) effect at low temperature. 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. A decrease in T1/2 induces an increase in T(LIESST). The results are discussed and compared with some other "metal-diluted" iron(II) spin crossover (SCO) complexes.

Mots clés: Dilution effects; Iron; Magnetic properties; Photomagnetism; Spin crossover

Domaines: Matériaux

Cherif Balde, Cédric Desplanches, C. Matthias Grunert, Y. Wei, Philipp Gutlich, et al.. Influence of metal dilution on the light-induced spin transition in two 1D chain compounds: [FexZn1-x(btzp)3](BF 4)2 and [FexZn1-x(endi)3](BF4)2 {btzp = 1,2-bis(tetrazol-1-yl)propane and endi = 1,2-bis(tetrazol-1-yl)ethane}. European Journal of Inorganic Chemistry, 2008, 34, pp.5382-5389. ⟨10.1002/ejic.200800570⟩. ⟨hal-00345269⟩