Structural origin of the gradual spin transition in a mononuclear iron(II) complex

Helena Shepherd (1) , Patrick Rosa (2) , Ian A. Fallis (3) , Philippe Guionneau (2) , Judith A. K. Howard (1) , Andrés E. Goeta (1)

1 Department of Chemistry
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
3 School of Chemistry [Cardiff]

Variable temperature single crystal X-ray diffraction and SQUID magnetometry experiments have revealed a gradual spin transition in [FeII(L)](ClO4)2 (where L=1,4,7-tris(2-aminophenyl)-1,4,7-triazacyclononane), centred around room temperature. The gradual nature of the spin transition has been attributed to the lack of significant intermolecular interactions between iron centres and the propensity of the counter ions to accommodate the internal strain in the crystal caused by spin crossover.

Mots clés: Organometallic compounds; X-ray diffraction; Magnetic properties; Crystal structure

Domaines: Matériaux

Helena Shepherd, Patrick Rosa, Ian A. Fallis, Philippe Guionneau, Judith A. K. Howard, et al.. Structural origin of the gradual spin transition in a mononuclear iron(II) complex. Journal of Physics and Chemistry of Solids, 2012, 73 (2), pp.193-197. ⟨10.1016/j.jpcs.2011.11.003⟩. ⟨hal-00653775⟩