We investigated the thermo- and photo-induced phase transitions between low spin (LS) and high spin (HS) states of the mol. 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 temp., is compared to the structures of the HS and LS phases at thermal equil. and to the thermally trapped HS state. The preliminary results presented here show that the structural reorganization is similar in the different HS states
