Physicochemical Properties of Long Chain Alkylated Imidazolium Based Chloride and Bis(trifluoromethanesulfonyl)imide Ionic Liquids

Hazrati, Nastaran; Abdouss, Majid; Beigi, Ali Akbar Miran; Pasban, Ali Asghar; Rezaei, Mahmoud

doi:10.1021/acs.jced.7b00242

Cited by 24 publications

(24 citation statements)

References 85 publications

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“…Despite the fact that the IL is actually mixed with PO as co-binders for the preparation of the carbon paste, the previous trends correlate well with the conductivities and viscosities that the [ [38][39][40][41][42][43][44]. It is a wellknown fact that the conductivity and viscosity for many ILs are generally inversely related [51], thus the more viscous the ionic liquid, the lower the conductivity observed due to the decrease of the ion mobility [44,51].…”

Section: Effect Of Chain Length Of Alkyl Substituted Imidazolium Catimentioning

confidence: 84%

Effect of Ionic Liquid Structure on the Electrochemical Response of Dopamine at Room Temperature Ionic Liquid‐modified Carbon Paste Electrodes (IL–CPE)

2020

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In this work 12 different ionic liquids (ILs) have been used added as co‐binders in the preparation of modified carbon paste electrodes (IL–CPEs) used for the voltammetric analysis of dopamine in Britton‐Robinson buffer. The ionic liquids studied were selected based on three main criteria: (1) increasing chain length of alkyl substituents (studying 1‐ethylimidazolium and ethyl, propyl, butyl, hexyl and decylmethylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquids); (2) nature of the counter ion (dicyanamide, bis(trifluoromethylsulfonyl)imide and hexafluorophosphate) in 1‐butyl‐3‐methylimidazolium ionic liquids; and (3) cation ring structures (1‐butyl‐3‐methylimidazolium, 1‐butyl‐1‐methylpiperidinium, 1‐butyl‐1‐methylpyrrolidinium and 1‐butyl‐3‐methylpyridinium) in bis(trifluoromethylsulfonyl)imide or hexafluorophosphate (1‐butyl‐3‐methylimidazolium or 1‐butyl‐3‐methylpyridinium as cations) ionic liquids. The use of IL as co‐binders in IL–CPE results in a general enhancement of both the sensitivity and the reversibility of dopamine oxidation. In square wave voltammetry experiments, the peak current increased up to a 400 % when 1‐ethyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide was used as co‐binder, as compared to the response found with the unmodified CPE. Experimental data provide evidence that electrostatic and steric effects are the most important ones vis‐à‐vis these electrocatalytic effects on the anodic oxidation of dopamine on IL–CPE. The relative hydrophilicity of dicyanamide anions reduced the electrocatalytic effects of the corresponding ionic liquids, while the use of 1‐ethyl‐3‐methylimidazolium hexafluorophosphate or 1‐ethyl‐3‐methylimidazolium bis(trifluoromethylsulfonyl)imide (two relatively small and highly hydrophobic ionic liquids) as co‐binders in IL–CPE resulted in the highest electrocatalytic activity among all of the IL–CPE studied.

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Section: Effect Of Chain Length Of Alkyl Substituted Imidazolium Catimentioning

confidence: 84%

Effect of Ionic Liquid Structure on the Electrochemical Response of Dopamine at Room Temperature Ionic Liquid‐modified Carbon Paste Electrodes (IL–CPE)

2020

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“…The K[C n C 1 Cp] data (circles) were measured in this work. The [C n C 1 Im]Cl data are averages from multiple sources, − given in the Supporting Information.…”

Section: Results and Discussionmentioning

confidence: 99%

Ionic Liquids in Wonderland: From Electrostatics to Coordination Chemistry

et al. 2019

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This work represents the first systematic study comparing a homologous series of alkali-based ionic liquids (ILs)potassium 1-alkyl-3-methylcyclopentadienyl, K[C n C1Cp]with their charge-inverted counterparts of the 1-alkyl-3-methylimidazolium chloride series, [C n C1Im]Cl. Three new compounds of the K[C n C1Cp] (n = 2, 8, or 10) were synthesized, purified, and analyzed by nuclear magnetic resonance, completing the series of previously reported derivatives (n = 4, 6). Further characterization involved differential scanning calorimetry and powder X-ray diffraction determinations. The results show that most of the alkali-based salts exhibit melting temperature values in the range commonly observed for halide-based ILs. However, striking structural differences were revealed by both X-ray diffraction and molecular dynamics results. These findings are consistent with the fact that alkali metal cations are efficient electron acceptors that can participate in interactions with a significant covalent character, namely, with aromatic moieties present in the cyclopentadienyl anions. This new concept extends the boundaries of ILs from the realm of noncovalent electrostatic systems to that of coordination chemistry.

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“…Development of novel task specific ionic liquids designed by introducing various functional groups to cation has attracted much attention considering its applications. Many research groups have reported alkyl chain substituted ionic liquids and tested for LIBs . However, in this case, only the anions present in ionic liquid provides Li + ion coordination sites by forming solvation shell.…”

Section: Introductionmentioning

confidence: 95%

Ethoxy‐Ester Functionalized Imidazolium based Ionic Liquids for Lithium Ion Batteries

et al. 2018

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Ethoxy ester functionalized imidazolium and bis(tri fluoromethanesulfonyl)imide based ionic liquids (ILs) are synthesized and considered as electrolyte for lithium ion batteries. The series of ethoxy ester functionalized ionic liquids were chosen with increase in ethoxy unit from one to three, followed by polymeric units. These ionic liquids provide both ester and ethoxy groups as interaction sites for Li+ ions enhancing the Li+ ion transportation, resulting in ionic conductivity of 10−3 Scm−1 at 25 °C, which is of 103 factor higher than ethoxy containing polyethylene oxide solid polymer electrolyte. It's noteworthy that the conductivity increases as ethoxy units are increased from one to three units, followed by a decrease for the polymeric ethoxy unit. Electrochemical stability window of these ionic liquids improves as the ethoxy groups are added to imidazolium cation. The Li/LiFePO4 cell fabricated with [ME3AMIm][TFSI] electrolyte shows good initial discharge capacity of 98.5 mAhg−1 at 0.05 C‐rate at room temperature, which gradually decreases with cycling. Systematic investigation of electrode surfaces by using SEM and EDX shows deposition of passivation layers on their surfaces. Ionic liquids fabricated by this facile method provide a promising model system for understanding the molecular interactions in promoting the lithium‐ion conduction mechanism. The advantages and the limits associated to series of ionic liquid electrolytes are critically investigated.

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Physicochemical Properties of Long Chain Alkylated Imidazolium Based Chloride and Bis(trifluoromethanesulfonyl)imide Ionic Liquids

Cited by 24 publications

References 85 publications

Effect of Ionic Liquid Structure on the Electrochemical Response of Dopamine at Room Temperature Ionic Liquid‐modified Carbon Paste Electrodes (IL–CPE)

Effect of Ionic Liquid Structure on the Electrochemical Response of Dopamine at Room Temperature Ionic Liquid‐modified Carbon Paste Electrodes (IL–CPE)

Ionic Liquids in Wonderland: From Electrostatics to Coordination Chemistry

Ethoxy‐Ester Functionalized Imidazolium based Ionic Liquids for Lithium Ion Batteries

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