Antagonism between extreme negative linear compression and spin crossover in [Fe(dpp)(2) (NCS)(2) ]⋅py.

Helena Shepherd (1, 2) , Tatiana Palamarciuc (1) , Patrick Rosa (1) , Philippe Guionneau (1) , Gábor Molnár (2) , Jean-François Létard (1) , Azzedine Bousseksou (2)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 LCC - Laboratoire de chimie de coordination

A scissor-like geometric mechanism is responsible for the strongest negative linear compression effect yet observed in a molecular material, [Fe(dpp)(2) (NCS)(2) ]⋅py (see picture; dpp=dipyrido[3,2-a:2'3'-c]phenazine), C gray, N blue, S yellow, Fe red). The same mechanism is also responsible for suppressing the high-spin to low-spin transition under pressure.

Mots clés: Iron; Mechanical properties; Molecular materials; N ligands; Spin crossover

Domaines: Matériaux

Helena Shepherd, Tatiana Palamarciuc, Patrick Rosa, Philippe Guionneau, Gábor Molnár, et al.. Antagonism between extreme negative linear compression and spin crossover in [Fe(dpp)(2) (NCS)(2) ]⋅py.. Angewandte Chemie International Edition, 2012, 51 (16), pp.3910-3914. ⟨10.1002/anie.201108919⟩. ⟨hal-00694977⟩