Iron mixed-valence complex, (n-C3H7)4N[FeIIFeIII(dto)3] (dto =C2O2S2), shows a
spin-entropy driven phase transition called charge transfer
phase transition around 120K and a ferromagnetic transition at 6.5 K. These phase
transitions remarkably depend on the hexagonal ring size in
two-dimensional honeycomb network structure of [FeIIFeIII(dto)3]∞. In order to
control the magnetic properties and the electronic state in the
dto-bridged iron mixed-valence system by means of photo-irradiation, we have
synthesized a photo-sensitive organic–inorganic hybrid system,
(SP)[FeIIFeIII(dto)3] (SP = spiropyran), and investigated the photo-induced effect on
the magnetic properties by the measurements of magnetic
susceptibility, ESR, IR, UV–vis and 57FeM
