Cation Dynamics in the Pyridinium Based Ionic Liquid 1-N-Butylpyridinium Bis((trifluoromethyl)sulfonyl) As Seen by Quasielastic Neutron Scattering

被引：23

作者：

Embs, Jan P. ^{[1
]}

Burankova, Tatsiana ^{[1
,2
]}

Reichert, Elena ^{[2
]}

Hempelmann, Rolf ^{[2
]}

机构：

[1] Paul Scherrer Inst, Neutron Scattering Lab, Villigen, Switzerland

[2] Univ Saarland, Dept Phys Chem, D-6600 Saarbrucken, Germany

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2012年 / 116卷 / 44期

关键词：

KERR-EFFECT SPECTRA; X-RAY-SCATTERING; NANOSTRUCTURAL ORGANIZATION; TEMPERATURE; HETEROGENEITY; SIMULATION; ANION; NITRATE;

D O I：

10.1021/jp3070344

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Quasielastic neutron scattering (QENS) has been used to study the cation dynamics in the pyridinium based ionic liquid (IL) 1-N-butylpyridinium bis((trifluoromethyl)sulfonyl)imide (BuPy-Tf2N). This IL allows for a detailed investigation of the dynamics of the cations only, due to the huge incoherent scattering cross section of the cation (sigma(cation)(inc) >> sigma(anion)(inc)) The measured spectra can be decomposed into two Lorentzian lines, indicative of two distinct dynamic processes. The slower of these two processes is diffusive in nature, whereas the faster one can be attributed to localized motions. The temperature dependence of the diffusion coefficient of the slow process follows an Arrhenius law, with an activation energy of E-A = 14.8 +/- 0.3 kJ/mol. Furthermore, we present here results from experiments with polarized neutrons. These experiments clearly show that the slower of the two observed processes is coherent, while the faster one is incoherent in nature.

引用

页码：13265 / 13271

页数：7

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