On the computation and contribution of conductivity in molecular ionic liquids Export

@article{citeulike:2776246, abstract = {In this study we present the results of the molecular dynamics simulation of the ionic liquids: 1-butyl-3-methyl-imidazolium tetrafluoroborate and trifluoromethylacetate as well as 1-ethyl-3-methyl-imidazolium dicyanamide. Ionic liquids are characterized by both a molecular dipole moment and a net charge. Thus, in contrast to a solution of simple ions in a (non-) polar solvent, rotational and translational effects influence the very same molecule. This study works out the theoretical framework necessary to compute the conductivity spectrum and its low frequency limit of ionic liquids. Merging these computed conductivity spectra with previous simulation results on the dielectric spectra of ionic liquids yields the spectrum of the generalized dielectric constant, which may be compared to experiments. This spectrum was calculated for the three ionic liquids over six orders of magnitude in frequency ranging from 10 MHz to 50 THz. The role of rotation and translation and their coupling term on the generalized dielectric constant is discussed in detail with a special emphasis on the zero-frequency limit. Thereby, the frequency dependence of the cross correlation between the collective rotational dipole moment and the current is discussed. {\copyright} 2008 American Institute of Physics. Art. No.: 134501}, address = {Department of Computational Biological Chemistry, University of Vienna, A-1090 Vienna, Austria}, author = {Schr\"{o}der, C. and Haberler, M. and Steinhauser, O.}, citeulike-article-id = {2776246}, citeulike-linkout-0 = {http://dx.doi.org/10.1063/1.2868752}, citeulike-linkout-1 = {http://www.scopus.com/record/display.url?view=extended&origin=resultslist&eid=2-s2.0-41849126377}, doi = {10.1063/1.2868752}, journal = {Journal of Chemical Physics}, keywords = {bf4, bmim, conductivity, dicyanamide, emim, ionic, liquid, moleculardynamics, rtil}, number = {13}, posted-at = {2008-05-09 17:22:16}, priority = {2}, title = {On the computation and contribution of conductivity in molecular ionic liquids}, url = {http://dx.doi.org/10.1063/1.2868752}, volume = {128}, year = {2008} }

TY - JOUR ID - citeulike:2776246 L3 - citeulike-article-id:2776246 N2 - In this study we present the results of the molecular dynamics simulation of the ionic liquids: 1-butyl-3-methyl-imidazolium tetrafluoroborate and trifluoromethylacetate as well as 1-ethyl-3-methyl-imidazolium dicyanamide. Ionic liquids are characterized by both a molecular dipole moment and a net charge. Thus, in contrast to a solution of simple ions in a (non-) polar solvent, rotational and translational effects influence the very same molecule. This study works out the theoretical framework necessary to compute the conductivity spectrum and its low frequency limit of ionic liquids. Merging these computed conductivity spectra with previous simulation results on the dielectric spectra of ionic liquids yields the spectrum of the generalized dielectric constant, which may be compared to experiments. This spectrum was calculated for the three ionic liquids over six orders of magnitude in frequency ranging from 10 MHz to 50 THz. The role of rotation and translation and their coupling term on the generalized dielectric constant is discussed in detail with a special emphasis on the zero-frequency limit. Thereby, the frequency dependence of the cross correlation between the collective rotational dipole moment and the current is discussed. © 2008 American Institute of Physics. Art. No.: 134501 IS - 13 JF - Journal of Chemical Physics AD - Department of Computational Biological Chemistry, University of Vienna, A-1090 Vienna, Austria TI - On the computation and contribution of conductivity in molecular ionic liquids VL - 128 KW - bf4 KW - bmim KW - conductivity KW - dicyanamide KW - emim KW - ionic KW - liquid KW - moleculardynamics KW - rtil AU - Schröder, C AU - Haberler, M AU - Steinhauser, O PY - 2008/// UR - http://dx.doi.org/10.1063/1.2868752 ER -