Resonance raman study of spin-crossover [Fe(Htrz)2(trz)](BF4)*H2O particles coated with gold

Yeny A. Tobon (1) , Céline Etrillard (2) , Olivier Nguyen (2) , Jean-François Létard (2) , Vina Faramarzi (3) , Jean-François Dayen (3) , Bernard Doudin (3) , Dario M. Bassani (1) , François Guillaume (1)

1 ISM - Institut des Sciences Moléculaires
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
3 IPCMS - Institut de Physique et Chimie des Matériaux de Strasbourg

Spin-crossover (SCO) particles of the [Fe(Htrz)2(trz)](BF4)*H2O polymeric complex were deposited on a glass slide and coated with gold. We found that normal Raman scattering is not appropriate for analysing such a material. However, the spin transition and the thermal hysteresis of the coated particles were successfully monitored by means of Raman spectroscopy using the 325 nm excitation line that is in pre-resonance with the Metal to Ligand Charge Transfer (MLCT) electronic absorption band of the low-spin state. The results obtained confirm the persistence of the spin-crossover properties of the gold coated particles. The strong enhancement of the Raman scattering using the 325 nm excitation opens interesting opportunities for monitoring the SCO of particles integrated in miniaturised devices.

Mots clés: Raman spectroscopy; Spin crossover; Coordination polymers; Magnetic properties; Gold

Domaines: Matériaux

Yeny A. Tobon, Céline Etrillard, Olivier Nguyen, Jean-François Létard, Vina Faramarzi, et al.. Resonance raman study of spin-crossover [Fe(Htrz)2(trz)](BF4)*H2O particles coated with gold. European Journal of Inorganic Chemistry, 2012, 35, pp.5837-5842. ⟨10.1002/ejic.201200562⟩. ⟨hal-00788823⟩