High spin to low spin relaxation regime change in a multistep 3D spin-crossover material

The paper reports the study of the photoinduced high spin (HS) state lifetime in a multistep spin crossover compound. Despite the pronounced three-step transition of the [Fe(dpsme)Pt(CN)(4)]center dot 2/3dpsme center dot xEtOH center dot yH(2)O {dpsme = 4,4'-di-(pyridylthio) methane; EtOH = ethanol} 3D compound, neither the T(LIESST) nor the relaxation kinetics exhibits stepwise features. From the detailed investigation (experiments and simulations) of these relaxations and the observation of the lightinduced thermal hysteresis, a phase transition around 58 K is suspected.