TY - JOUR
T1 - Cation size effect on photomagnetism and charge transfer phase transition of iron mixed-valence complexes with spiropyrans
AU - Yoshida, Junya
AU - Kida, Noriyuki
AU - Okazawa, Atsushi
AU - Kojima, Norimichi
N1 - Funding Information:
This work was supported by a Grant-in Aid for Scientific Research from Japan Society for the Promotion of Science, Japan (Grant Numbers 22350057 and 24655115 ).
PY - 2013
Y1 - 2013
N2 - We have investigated the magnetic properties of a photoresponsive organic-inorganic hybrid system, (SP-R)[FeIIFeIII(dto) 3] (SP = spiropyran; R = Me, Et, Pr; dto = C2O 2S2), under hydrostatic pressures. At ambient pressure, (SP-Et)[FeIIFeIII(dto)3] and (SP-Pr)[Fe IIFeIII(dto)3] undergo one and two ferromagnetic phase transitions corresponding to the high-temperature phase with the spin configuration of FeII(S = 2)-FeIII(S = 1/2), while (SP-Me)[FeIIFeIII(dto)3] undergoes two ferromagnetic phase transitions corresponding to the coexistence of the high-temperature phase and the low-temperature phase with the spin configuration of FeII(S = 0)-FeIII(S = 5/2). Under hydrostatic pressures, (SP-R)[FeIIFeIII(dto)3] (R = Et, Pr) undergo a new ferromagnetic phase transition corresponding to the low-temperature phase caused by the pressure-induced charge transfer phase transition.
AB - We have investigated the magnetic properties of a photoresponsive organic-inorganic hybrid system, (SP-R)[FeIIFeIII(dto) 3] (SP = spiropyran; R = Me, Et, Pr; dto = C2O 2S2), under hydrostatic pressures. At ambient pressure, (SP-Et)[FeIIFeIII(dto)3] and (SP-Pr)[Fe IIFeIII(dto)3] undergo one and two ferromagnetic phase transitions corresponding to the high-temperature phase with the spin configuration of FeII(S = 2)-FeIII(S = 1/2), while (SP-Me)[FeIIFeIII(dto)3] undergoes two ferromagnetic phase transitions corresponding to the coexistence of the high-temperature phase and the low-temperature phase with the spin configuration of FeII(S = 0)-FeIII(S = 5/2). Under hydrostatic pressures, (SP-R)[FeIIFeIII(dto)3] (R = Et, Pr) undergo a new ferromagnetic phase transition corresponding to the low-temperature phase caused by the pressure-induced charge transfer phase transition.
KW - Charge transfer phase transition
KW - Dithiooxalate
KW - High pressure
KW - Iron mixed-valence complexes
KW - Photoisomerization
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U2 - 10.1016/j.poly.2013.02.070
DO - 10.1016/j.poly.2013.02.070
M3 - Article
AN - SCOPUS:84887499580
SN - 0277-5387
VL - 66
SP - 102
EP - 107
JO - Polyhedron
JF - Polyhedron
ER -