Enhancement of Ionic Conductivity in Organic Ionic Plastic Crystals by Introducing Racemic Ammonium Ions

被引：9
|
作者：
Matsuki, Masaya [1 ]
Yamada, Teppei [1 ,2 ,3 ]
Dekura, Shun [4 ]
Kitagawa, Hiroshi [4 ]
Kimizuka, Nobuo [1 ,2 ]
机构：
[1] Kyushu Univ, Grad Sch Engn, Dept Chem & Biochem, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan
[2] Kyushu Univ, Ctr Mol Syst, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan
[3] Japan Sci & Technol Agcy, PRESTO, Nishi Ku, 744 Motooka, Fukuoka 8190395, Japan
[4] Kyoto Univ, Grad Sch Sci, Div Chem, Sakyo Ku, Kyoto 6068502, Japan
来源：
CHEMISTRY LETTERS | 2018年 / 47卷 / 04期
关键词：
Organic ionic plastic crystals; Asymmetry; Ionic conductivity; PHASES;
D O I：
10.1246/cl.171181
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
An organic ionic plastic crystal (OIPC) consisting of racemic N1233'Tf2N (1) (N-1233' = NR1R2R3R4, R-1 = Me, R-2 = Et, R-3 = n-propyl, R-4 = isopropyl, Tf2N = bis(trifluoromethanesulfonyl)imide) is developed. 1 displays three solid phases in addition to the high-temperature liquid phase, and two intermediate phases are assigned to OIPC by DSC, powder XRD and solid-state NMR measurements. Ionic conductivity of 1 showed increase from the low-temperature region, and diffusion of Tf2N anions was confirmed even at -27 degrees C by NMR spectroscopy. This behavior is distinct from that of symmetric N1223'Tf2N (2), which showed much lower ionic conductivity at low temperatures. The introduction of racemic ions in OIPCs weakens the net intermolecular interactions and it enhances molecular motion and accordingly the ionic conductivity.
引用
收藏
页码：497 / 499
页数：3
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