Ionic conductivity, infrared and Raman spectroscopic studies of 1-methyl-3-propylimidazolium iodide ionic liquid with added iodine

被引:102
作者
Jerman, I. [1 ]
Jovanovski, V. [1 ]
Vuk, A. Surca [1 ]
Hocevar, S. B. [1 ]
Gaberscek, M. [1 ]
Jesih, A. [2 ]
Orel, B. [1 ]
机构
[1] Natl Inst Chem, Ljubljana 1000, Slovenia
[2] Jozef Stefan Inst, Ljubljana 1000, Slovenia
关键词
ionic liquid; triiodide; pentaiodide; conductivity; IR spectroscopy; in situ Raman spectroclectrochemistry;
D O I
10.1016/j.electacta.2007.09.043
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Polyiodides (1(x)(-). x=3 and 5) and 2I(-)...I-2 adducts were established from the Raman spectra study of 1-methyl-3-propylimidazolium iodide (MPIm(+)I(x)(-) ; 1 <= x <= 5) ionic liquids containing various amounts of iodine (0mol <= I-2 <= 2 mol). The existence of I-3(-) and 2I(-)...I-2 was established for 1 <= x <= 2.5, symmetric I-3(-) ions for x=3, while linear and discrete I-5(-) was substantiated for 3 <= x <= 5. The presence of polyiodide species ill MPIm(+)I(x)(-) (1 <= x <= 5) was correlated with all enhanced ionic conductivity, attributed to the established relay-type Grotthus mechanism. Two-step conductivity increase was also reflected in decrease of the hydrogen bond interactions between the C-H ring groups and polyiodides. While in the concentration range 1 <= x <= 3 (triiodides and tetraiodides) IR bands changed only slightly in intensity, in the concentration range x > 3 the C-H stretching bands (3040-3170 cm(-1)) split and the new band at 1585 cm(-1) appeared in the IR spectra beside the already existing Im(+) ring stretching mode at 1566 cm(-1). (c) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2281 / 2288
页数:8
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