850331-04-3Relevant articles and documents
Conducting and magnetic properties of 1-ethyl-3-methylimidazolium (EMI) salts containing paramagnetic irons: Liquids [EMI][MIIICl 4] (M = Fe and Fe0.5Ga0.5) and solid [EMI] 2[FeIICl4]
Yoshida, Yukihiro,Otsuka, Akihiro,Saito, Gunzi,Natsume, Seiichi,Nishibori, Eiji,Takata, Masaki,Sakata, Makoto,Takahashi, Masahide,Yoko, Toshinobu
, p. 1921 - 1928 (2005)
An EMI-based room-temperature (RT) ionic liquid containing d5 trivalent iron(III) ions [EMI][FeIIICl4] was fully investigated, where EMI is 1-ethyl-3-methylimidazolium. The viscosity of the salt is 14 cP at 30°C, and its ionic conductivity is as high as 1.8 × 10-2 S cm-1 at 20°C. The high conductivity and fluidity can be attributed to the reduced interionic Coulomb attractions owing to the nephelauxetic effect. Magnetic susceptibility shows the Curie-Weiss behavior arising from S = 5/2 high-spin electronic state on iron(III) ions in both liquid and solid states, leading to the conductive-paramagnetic bifunctional RT ionic liquid. The solidified salt passes through an antiferromagnetic transition at 4.2 K. Diamagnetic [EMI][GaIIICl 4] and paramagnetic [EMI][FeIIICl4] 0.5[GaIIICl4]0.5 are also RT ionic liquids and show similar conductivities (1.8-2.0 × 10-2 S cm-1 at 20°C) and viscosities (12-13 cP at 30°C). These results indicate that the influence of paramagnetic iron(III) ions upon the ionic conductivity and viscosity is negligible in the present system. A 2:1 EMI salt containing d 6 divalent iron(II) ions [EMI]2[FeIICl 4] melts at 86°C. Its crystal structure determined by a synchrotron X-ray powder diffraction measurement is analogous to those of the reported [EMI]2[CoIICl4] and [EMI] 2[NiIICl4] with expanded lattice.
Tunable LCST-type phase behavior of [FeCl4]--based ionic liquids in water
Pei, Yuanchao,Cao, Yuan,Huang, Yanjie,Song, Xinxin,Wang, Huiyong,Zhao, Yuling,Wang, Jianji
, p. 587 - 593 (2016/06/13)
In this work, 16 kinds of [FeCl4]--based magnetic ionic liquids (ILs) with different cation structures have been designed and synthesized, and their structures are characterized by IR and Raman spectroscopy. Then the lower critical solution temperature (LCST)-type phase behavior of these magnetic ILs in water is investigated as a function of concentration. It is shown that cation structure, alkyl chain length and molar ratio of FeCl3/chloride IL have a significant influence on the LCST of the mixtures. The phase separation temperature can be tuned efficiently by these factors. Meanwhile, the LCST-type phase separation process is also investigated by dynamic light scattering. The results support the mechanism that the hydrogen bonds of the [FeCl4]- anion with water have been gradually disrupted to form ILs aggregates with increasing temperature. In addition, the stability of the ILs in water is also examined in some details. These LCST-type phase separation systems may have potential applications in extraction and separation techniques at room temperature.
NORMAL-TEMPERATURE MOLTEN SALT, ELECTRODE, CELL, AGENT FOR PREVENTING CHARGE-UP, AND METHOD FOR OBSERVING SAMPLE
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Page/Page column 12, (2012/11/13)
An obj ect of the present invention is to provide an ambient temperature molten salt having excellent electron conductivity in addition to ion conductivity. The present invention attains the object by providing an ambient temperature molten salt comprising a first imidazolium salt having a cationic segment represented by the general formula (1) and an anionic segment represented by MX4 (where M is a transition metal and X is a halogen); and a second salt having a cationic segment as a monovalent cation and an anionic segment as a halogen.
