Papers by Keyword: Spin Crossover

Abstract: Three new coordination compounds of iron (II), [Fe (HC(Pz)₃)₂](C₈H₅O₄)₂^.C₈H₆O₄ (I), [Fe (HC(Pz)₃)₂](C₁₀H₇SO₃)₂^.2H₂O (II) and Fe (HC(Pz)₃)₂](C₁₂H₂₅SO₄)₂ (III), where HC(Pz)₃ is the tridentate chelator tris(pyrazol-1-yl) methane, have been synthesized and investigated by X-ray structure analysis, electronic and IR spectroscopy, static magnetic susceptibility method. The magnetochemical study of complexes I–III in the interval from 300 to 500 K showed that they possessed the high-temperature spin crossover ¹A₁ ↔ ⁵T₂ accompanied by thermochromism (the pink ↔ white color change).

Abstract: We investigated the thermo- and photo-induced phase transitions between low spin (LS) and high spin (HS) states of the molecular crystal of [Fe(PM-BiA)2(NCS)2] in the orthorhombic form, by using X-ray diffraction. The structure of the photoinduced HS state, generated from the LS state at low temperature, is compared to the structures of the HS and LS phases at thermal equilibrium and to the thermally trapped HS state. The preliminary results presented here show that the structural reorganization is similar in the different HS states.