Valence-tautomeric ionic liquid composed of a cobalt bis(dioxolene) complex dianion.
We successfully synthesized a room-temperature ionic liquid showing valence-tautomeric behavior, by combining a cobalt bis(dioxolene) complex dianion with a bulky trihexyl(tetradecyl)phosphonium cation. Its magnetic moment exhibits a gradual increase up to ca. 280 K through the glass transition (262 K) and then has an abrupt upturn at around 300 K. The valence-tautomeric behavior was confirmed by the temperature dependence of the electronic absorption spectra. This successful implementation allowed the "smart" ionic liquid, whose magnetic behavior responds evidently to temperature change.
Research Institute, Meijo University, Shiogamaguchi 1-501, Tempaku, Nagoya 468-8502, Japan. yyoshida@ccmfs.meijo-u.ac.jp
Yukihiro
Y
Yoshida
Hirofusa
H
Tanaka
Gunzi
G
Saito
Lahcène
L
Ouahab
Hiroyuki
H
Yoshida
Naoki
N
Sato