Dicationic imidazolium based ionic liquids: Synthesis and properties

Khan, Amir Sada; Man, Zakaria; Arvina, Annie; Bustam, Mohammad Azmi; Nasrullah, Asma; Ullah, Zahoor; Sarwono, Ariyanti; Muhammad, Nawshad

doi:10.1016/j.molliq.2016.11.131

Cited by 70 publications

(38 citation statements)

References 41 publications

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“…The thermal stability decreased with the increase of the length of the alkyl chain. However, these dicationic imidazole ILs displayed higher thermal stabilities than the traditional monocationic imidazole ILs , .…”

Section: Resultsmentioning

confidence: 92%

“…This means, IL6A and IL12A were prepared by the similar procedure like IL3A except that 24.44 g (100 mmol) of 1,6-dibromoctane and 32.86 g (100 mmol) of 1,12-dibromododecane were used, respectively. Likewise, 16.32 g (40 mmol) IL6A and 19.68 g (40 mmol) IL12A were used for the synthesis of IL6B and IL12B, respectively.…”

Section: Synthesis Of Imidazole Dicationic Ilsmentioning

confidence: 99%

“…Dicationic ILs are more designable and effective than monocationic ILs because they have more possible combinations, such as various anions, cations, and linkers [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Producing Fatty Acid Methyl Esters from Free Fatty Acids with Ionic Liquids as Catalyst

et al. 2018

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Three Brønsted acidic imidazole dicationic ionic liquids (ILs) with different length of alkyl chains, [Cn(Mim)2][HSO4]2 (n = 3, 6, 12), were prepared and used as catalyst for the esterification reaction of free fatty acids and methanol. Taking oleic acid as model acid, the catalytic performances of the synthesized ILs for the esterification were evaluated. The main physicochemical properties of the ILs, thermal stability, acidity, solubility in common solvents, and causticity on Austenitic stainless steel 316, were examined. [C3(Mim)2][HSO4]2 demonstrated the highest catalytic activity and enabled to assess the preliminary optimum esterification condition of oleic acid and methanol. Under optimized reaction conditions, the yield of oleic acid methyl ester was up to 95 %. The ILs have great potential as catalysts for producing fatty acid methyl esters from long‐chain free fatty acids.

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Section: Resultsmentioning

confidence: 92%

Section: Synthesis Of Imidazole Dicationic Ilsmentioning

confidence: 99%

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Producing Fatty Acid Methyl Esters from Free Fatty Acids with Ionic Liquids as Catalyst

et al. 2018

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“…The structures of the dicationic IL (IL2-di) and its monocationic analogue (IL2), which was used as a benchmark in this study, are shown in Figure 1. connecting chain [28][29][30][31] that was associated with better tribological properties, higher stability, lower toxicity and corrosiveness of the dicationic ILs [14,[31][32][33][34][35][36][37][38][39][40][41]. In the literature, there is a consensus of opinions that the good friction-reduction and wearresistant properties of ILs are owed to their ability to form stable adsorbed layers and protective tribofilms [4,27,[42][43][44].…”

Section: Methodsmentioning

confidence: 99%

“…Another approach relies on bridging two cationic head groups by PEG chain. Molecular dynamics simulation and advanced spectroscopy have revealed significant differences in structural heterogeneity and nano-organization between monocationic and geminal dicationic ILs with a long connecting chain [28][29][30][31] that was associated with better tribological properties, higher stability, lower toxicity and corrosiveness of the dicationic ILs [14,[31][32][33][34][35][36][37][38][39][40][41].…”

Section: Introductionmentioning

confidence: 99%

Time-Resolved Characterization of Dynamic Tribochemical Processes for Dicationic Imidazolium Ionic Liquid

et al. 2017

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Dynamic tribochemical processes for dicationic ionic liquid containing a geminal imidazolium cation head group bridged by a poly(ethylene glycol) and a bis(trifluoromethylsulfonyl)imide anion were studied using time-resolved mechanically stimulated gas emission mass-spectrometry (MSGE-MS). In comparison with similar monocationic imidazolium ionic liquids with short alkyl or long polyether side chains, the dicationic ionic liquid had a lower coefficient of friction on Ti6Al4V alloy and smoother behavior. The analysis of volatile decomposition products suggested multiple tribochemical reactions in which both anionic and cationic moieties are involved. The tribochemical degradation of cations was mainly through the detachment of the side and bridging chains from the imidazolium head groups. The absence of volatile products containing nitrogen implies that the imidazole group remained unchanged. Hydrogen and water desorption were attributed to the reactions of hydrogen fluoride being a product of anion degradation with titanium and titanium oxide, respectively.

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Physico‐Chemical Properties of Magnetic Dicationic Ionic Liquids with Tetrahaloferrate Anions

et al. 2023

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A series of imidazolium‐based symmetrical and asymmetrical dicationic ionic liquids (DcILs) with alkyl spacers of different length and with [FeCl 3 Br] − as counter ion have been synthesized. The synthesized DcILs are characterized by using FTIR and Raman spectroscopy as well as mass spectrometry, along with single‐crystal XRD analysis. Physicochemical properties such as solubility, thermal stability and magnetic susceptibility are also measured. These compounds show low melting points, good solubility in water and organic solvents, thermal stability, and paramagnetism. The products of molar susceptibility and temperature (χ mol ⋅T) for the synthesized DcILs have been found between 4.05 to 4.79 emu mol −1 K Oe −1 and effective magnetic moment values have also been determined to be compared to that expected from the spin‐only approximation.

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Dicationic imidazolium based ionic liquids: Synthesis and properties

Cited by 70 publications

References 41 publications

Producing Fatty Acid Methyl Esters from Free Fatty Acids with Ionic Liquids as Catalyst

Producing Fatty Acid Methyl Esters from Free Fatty Acids with Ionic Liquids as Catalyst

Time-Resolved Characterization of Dynamic Tribochemical Processes for Dicationic Imidazolium Ionic Liquid

Physico‐Chemical Properties of Magnetic Dicationic Ionic Liquids with Tetrahaloferrate Anions

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