TY - JOUR
T1 - Reversible photomagnetism in a cobalt layered compound coupled with photochromic diarylethene
AU - Okubo, M.
AU - Enomoto, M.
AU - Kojima, N.
N1 - Funding Information:
The authors wish to thank Prof M. Irie for his kind advice on the synthesis of diarylethene. The authors are grateful to NIHON ZEON for the supply of perfluorocyclopentene. This work was supported by a Grant-in-aid for Scientific Research and a Grant-in-aid of 21st century COE (Center of Excellence) Program from the Ministry of Education, Culture, Sports, Science and Technology, Japan. One of the authors (M. Okubo) was supported by Research Fellowships of the Japan Society for the Promotion of Science for Young Scientists.
PY - 2005/6
Y1 - 2005/6
N2 - Photomagnetism is one of the most attractive topics in recent research on molecular solids. In order to produce a photo-controllable magnet, we have synthesized a novel organic-inorganic hybrid system coupled with a photochromic diarylethene anion, 2,2′-dimethyl-3,3′-(perfluorocyclopentene-1,2- diyl)bis(benzo[b]thiophene-6-sulfonate) (1a) and cobalt LDHs (layered double hydroxides). Based on the elemental analysis, the title compound, which was synthesized by the anion exchange reaction between Co2(OH) 3(CH3COO)·H2O (2) and 1a, has the chemical composition, Co4(OH)7(1a) 0.5·3H2O (3). Powder X-ray diffraction analysis revealed the interlayer distance of c=27.8 Å. The magnetic susceptibility measurements elucidated the ferromagnetic intra- and inter-layer interactions and the Curie temperature of Tc=9 K. By UV irradiation of 313 nm, 3 shows the photo-isomerization of diarylethene anion from the open form to the closed one in solid state, which leads to the decreases in the coercive field and the remnant magnetization. Furthermore, the photo-excited state is returned to the initial state (open form) almost reversibly by visible irradiation of 550 nm.
AB - Photomagnetism is one of the most attractive topics in recent research on molecular solids. In order to produce a photo-controllable magnet, we have synthesized a novel organic-inorganic hybrid system coupled with a photochromic diarylethene anion, 2,2′-dimethyl-3,3′-(perfluorocyclopentene-1,2- diyl)bis(benzo[b]thiophene-6-sulfonate) (1a) and cobalt LDHs (layered double hydroxides). Based on the elemental analysis, the title compound, which was synthesized by the anion exchange reaction between Co2(OH) 3(CH3COO)·H2O (2) and 1a, has the chemical composition, Co4(OH)7(1a) 0.5·3H2O (3). Powder X-ray diffraction analysis revealed the interlayer distance of c=27.8 Å. The magnetic susceptibility measurements elucidated the ferromagnetic intra- and inter-layer interactions and the Curie temperature of Tc=9 K. By UV irradiation of 313 nm, 3 shows the photo-isomerization of diarylethene anion from the open form to the closed one in solid state, which leads to the decreases in the coercive field and the remnant magnetization. Furthermore, the photo-excited state is returned to the initial state (open form) almost reversibly by visible irradiation of 550 nm.
KW - A. Magnetically ordered materials
KW - D. Optical properties
KW - D. Phase transitions
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U2 - 10.1016/j.ssc.2005.02.025
DO - 10.1016/j.ssc.2005.02.025
M3 - Article
AN - SCOPUS:18244379287
SN - 0038-1098
VL - 134
SP - 777
EP - 782
JO - Solid State Communications
JF - Solid State Communications
IS - 11
ER -