ESR studies on the pressure and temperature dependence of electron self-exchange kinetics between tetrathiafulvalene (TTF) and its radical cation in ionic liquids and organic solvents

A Binary Mixture of Ionic Liquids as a New Approach for an Experimental Diffusion Correction in the Study of Activated Processes

“…Unfortunately,w ef ound that the change in viscosity upon changing the number and/orl ength of the alkyl substituents for imidazolium-based ILs, which is the system investigated previously, [4] is too small to achieve ar easonable temperature window upon mixing. Unfortunately,w ef ound that the change in viscosity upon changing the number and/orl ength of the alkyl substituents for imidazolium-based ILs, which is the system investigated previously, [4] is too small to achieve ar easonable temperature window upon mixing.…”

“…At first, we tried to use cations of the same structure with different alkyl substituents. Unfortunately,w ef ound that the change in viscosity upon changing the number and/orl ength of the alkyl substituents for imidazolium-based ILs, which is the system investigated previously, [4] is too small to achieve ar easonable temperature window upon mixing. Therew as as imilar problemw ith other aromatic cations;t herefore, we changed to an ammonium-based cation.…”

“…In the beginning, as trong rise is observed with the addition of [OMA][NTf 2 ]. We reproduced the published spectra with ah yperfine splitting constant of a 4H = 0.124 mT, [4] which did not vary significantly upon changing the temperature and/or the mixture. [14] At am olar fraction of approximately 0.8 of [EMIM][NTf 2 ], however,ap lateau was reached at al ower H h .W ea re currently unable to explain this seemingly strangeb ehavior conclusively.I tm ight be attributedt oe ffects arising from different impuritiesw ithin each of the two components.T his is as trong argumentf or the fact that characterization is always necessaryf or each new batch of IL.…”

“…[1] New research is focusedo ne nergy applications, for which pure and mixtureso fI Ls substitute conventionale lectrolytes in, for example, lithium-ion batteries. [4] Because ILs are miscible with each other,as ignificant amount of work is dedicated to binarym ixtures to design solvents with specific properties. These viscosities are strongly dependent on temperature, as reflected in large activation barriers of mass transport, H h ,o fa round 30 kJ mol À1 for commercial ILs.…”

“…The issue was already raised in ap revious publication. [4] Because ILs are miscible with each other,as ignificant amount of work is dedicated to binarym ixtures to design solvents with specific properties. [5] Our goal was to developa n experimental routine that eliminated the temperature dependence of viscosity by designing as pecial binary mixture of ILs.…”