In the case of mixed-valence system whose spin states are situated in the spin crossover region, new types of conjugated phenomena coupled with spin and charge are expected. From this viewpoint, we have investigated the multifunctional properties coupled with spin, charge and photon for the organic-inorganic hybrid system, A[Fe
IIFe
III(dto)
3] (A = (
n-C
nH
2n+1)
4N, spiropyran; dto = C
2O
2S
2) by means of the magnetic susceptibility and
57Fe Mössbauer spectroscopy. In (
n-C
nH
2n+1)
4N[Fe
IIFe
III(dto)
3], in addition to the ferromagnetic transition, a new type of phase transition called charge transfer phase transition (CTPT) takes place around 120 K, where the thermally induced charge transfer between Fe
II and Fe
III occurs reversibly. The charge transfer phase transition and the ferromagnetic transition for (
n-C
nH
2n+1)
4N[Fe
IIFe
III(dto)
3] remarkably depend on the size of intercalated cation. In the case of (SP) [Fe
IIFe
III(dto)
3] (SP = spiropyran), the photoinduced isomerization of SP under UV irradiation induces the charge transfer phase transition in the [Fe
IIFe
III(dto)
3] layer and the remarkable change of the ferromagnetic transition temperature.
抄録全体を表示