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Dicationic Ionic Liquid

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https://www.readbyqxmd.com/read/30306995/optical-kerr-effect-spectroscopy-of-cs-2-in-monocationic-and-dicationic-ionic-liquids-insights-into-the-intermolecular-interactions-in-ionic-liquids
#1
Eshan Gurung, Dujuan Meng, Lianjie Xue, George Tamas, Ruth M Lynden-Bell, Edward L Quitevis
A comparative study of the intermolecular dynamics of CS2 in monocationic and dicationic ionic liquids (ILs) was performed using optical heterodyne-detected Raman-induced Kerr effect spectroscopy (OHD-RIKES). The reduced spectral densities (RSDs) of mixtures of CS2 in 1-alkyl-3-methylimidazolium bis[(trifluoromethane)sulfonyl]amide ([CnC1im][NTf2] for n = 3-5) and 1,2n-bis(3-methylimidazolium-1-yl) alkane bis[(trifluoromethane)sulfonyl]amide ([(C1im)2C2n][NTf2]2 for n = 3-5) were investigated as a function of concentration at 295 K...
October 11, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/30273773/modeling-protic-dicationic-ionic-liquids-based-on-quaternary-ammonium-imidazolium-or-pyrrolidinium-cations-and-bis-trifluoromethanesulfonyl-imide-anion-structure-and-spectral-characteristics
#2
Prakash L Verma, Shridhar P Gejji
Protic dicationic ionic liquids (PDILs) have attracted growing attention owing to their applications in domains of electrochemistry, proton conducting materials and other diverse areas. In the present work protic dicationic ionic liquids (PDILs) comprising of quaternary ammonium-, imidazolium- or pyrrolidinium-dications and bis(trifluoromethanesulfonyl)imide (Tf2 N‾) anion have been modelled as the dication-(Tf2 N)2 complexes. Electronic structure, vibrational and 1 H NMR spectra of these complexes have been derived employing the M06-2x density functional theory...
September 21, 2018: Journal of Molecular Graphics & Modelling
https://www.readbyqxmd.com/read/30259657/gas-chromatography-selectivity-of-new-phosphonium-based-dicationic-ionic-liquid-stationary-phases
#3
Rahul A Patil, Mohsen Talebi, Leonard M Sidisky, Alain Berthod, Daniel W Armstrong
Three phosphonium-based dicationic ionic liquids were synthesized as bis(trifluoromethylsulfonyl) imide salts. The three dications had a nonyl spacer between two identical phosphonium-substituted groups. The three phosphonium moieties were dipropyl(phenyl), diphenyl(propyl), and diphenyl(toluyl). The physicochemical properties of the dicationic ionic liquids were appropriate to prepare 30 m capillary columns that were tested in gas chromatography. A unique selectivity compared to different polysiloxane or polar cyanosiloxane commercial columns was observed for selected mixes of phthalates, polyaromatic hydrocarbons, polychlorobiphenyls, and dioxins...
September 27, 2018: Journal of Separation Science
https://www.readbyqxmd.com/read/30230823/dicationic-ionic-liquids-of-herbicide-2-4-dichlorophenoxyacetic-acid-with-reduced-negative-effects-on-environment
#4
Junfan Niu, Zhaopeng Zhang, Jingyue Tang, Gang Tang, Jiale Yang, Weichen Wang, Hong Huo, Na Jiang, Jianqiang Li, Yongsong Cao
Due to high volatility and water solubility, 2,4-dichlorophenoxyacetic acid (2,4-D) can easily enter into the atmosphere and water bodies by volatilization, drift, leaching, or runoff, which results in potential threats to the environment and human health. The physicochemical properties of pesticides can be regulated by preparing their ionic liquids. In this work, a series of dicationic ionic liquids (DILs) of 2,4-D were prepared to reduce its environmental risk and enhance herbicidal activity. The solubility, octanol-water partition coefficient, surface tension, and volatilization rate results of DILs showed that these properties could be optimized by choosing appropriate countercations...
September 27, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/30147225/dicationic-ionic-liquids-as-new-feeding-deterrents
#5
Damian K Kaczmarek, Kamil Czerniak, Tomasz Klejdysz
In this study, new quaternary bis(ammonium) salts with alkyl-1,X-bis(dimethyldecylammonium) cation and saccharinate, acesulfamate, lactate and pyroglutamate anions were synthesized and characterized by 1 H and 13 C NMR spectroscopy. Thermal gravimetric and differential scanning calorimetry analyses confirmed that all salts were thermally stable and the majority of them exhibited melting points below 100 °C. The physicochemical properties (viscosity, density, refractive index values, and solubility) of the obtained salts were determined for three compounds with lactate anions...
2018: Chemické Zvesti
https://www.readbyqxmd.com/read/30023787/impact-of-anions-on-the-partition-constant-self-diffusion-thermal-stability-and-toxicity-of-dicationic-ionic-liquids
#6
Clarissa P Frizzo, Caroline R Bender, Paulo R S Salbego, Carla A A Farias, Thayanara C da Silva, Sílvio T Stefanello, Tássia L da Silveira, Félix A A Soares, Marcos A Villetti, Marcos A P Martins
Partition constants ( K D ° ), molecular dynamics ( T 1 , T 2 , and DOSY measurements), thermal stability, and toxicity of dicationic ionic liquids (ILs) were determined. The dicationic ILs derived from 1, n -bis(3-methylimidazolim-1-yl)octane, [BisOct(MIM)2 ][2X] (in which X = Cl, Br, NO3 , SCN, BF4 , and NTf2 ), were evaluated to verify the influence of anion structure on the IL properties. A monocationic IL [Oct(MIM)][Br] was also monitored for comparison. In general, the solubility of the ILs followed the anion free energy of hydration (Δ G °hyd )...
January 31, 2018: ACS Omega
https://www.readbyqxmd.com/read/29967711/solid-liquid-separation-properties-of-thermoregulated-dicationic-ionic-liquid-as-extractant-of-dyes-from-aqueous-solution
#7
Rui Lv, Shuya Cui, Yangmei Zou, Li Zheng
Two thermoregulated dicationic ionic liquids were synthesized and applied for effective extraction of the common dye malachite green oxalate (MG). The extraction parameters such as amount of ionic liquids, pH of water phase, extraction time, cooling time, and centrifugal time on the extraction efficiency were investigated systematically. It revealed that the dye has been successfully extracted into the ionic liquids, with high extraction efficiency higher than 98%, and recovery of 98.2%-100.8%, respectively...
2018: Journal of Analytical Methods in Chemistry
https://www.readbyqxmd.com/read/29900373/synthesis-and-characterization-data-of-monocationic-and-dicationic-ionic-liquids-or-molten-salts
#8
M G Montalbán, G Víllora, P Licence
Data presented in this article are related with the research paper entitled "Ecotoxicity assessment of dicationic versus monocationic ionic liquids as a more environmentally friendly alternative" [1]. The present article describes the synthesis steps and characterization data of a set of twenty-six imidazolium, pyrrolidinium and pyridinium-based ionic liquids (ILs) or molten salts: nine monocationic and seventeen dicationic. Specifically, the chemical structure of the compounds was confirmed by 1 H NMR, 13 C NMR and 19 F NMR spectroscopy and mass spectrometry (MS)...
August 2018: Data in Brief
https://www.readbyqxmd.com/read/29862431/correction-to-branched-chain-dicationic-ionic-liquids-for-fatty-acid-methyl-ester-assessment-by-gas-chromatography
#9
Mohsen Talebi, Rahul A Patil, Leonard M Sidisky, Alain Berthod, Daniel W Armstrong
The authors would like to call the reader's attention to the fact that the original publication included some corrections needed to be addressed.
July 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29767208/insights-into-the-thermal-phase-transition-behavior-of-a-gemini-dicationic-polyelectrolyte-in-aqueous-solution
#10
Yingna Zhang, Hui Tang, Peiyi Wu
The thermal-induced phase transition behavior of a LCST-type poly(ionic liquid) (PIL) aqueous solution with gemini-cationic structure, poly[(1,8-octanediyl-bis(tri-n-butylphosphonium)4-styrene sulfonate)] (P[SS-P2]), was investigated in this paper. Based on the calorimetric measurements, a unique dependence of transition points on concentration was found in P[SS-P2] aqueous solution compared to its mono-cationic PIL and [SS-P2] aqueous solution. Optical microscopy showed that globular microscopic droplets were formed during the phase transition, suggesting that gemini dications and the possible dynamic ionic bonds may facilitate the liquid-liquid phase separation (LLPS) in P[SS-P2] aqueous solution...
May 30, 2018: Soft Matter
https://www.readbyqxmd.com/read/29684267/evaporation-study-of-an-ionic-liquid-with-a-double-charged-cation
#11
Norbert S Chilingarov, Maksim S Zhirov, Anna M Shmykova, Ekaterina A Martynova, Lev M Glukhov, Elena A Chernikova, Leonid M Kustov, Vitaliy Yu Markov, Vitaliy A Ioutsi, Lev N Sidorov
The evaporation of a dicationic ionic liquid, 1,3-bis(3-methylimidazolium-1-yl)propane bis(trifluoromethanesulfonyl)amide ([C3 (MIm)2 2+ ][Tf2 N- ]2 ), was studied by Knudsen effusion mass spectrometry. Its evaporation is accompanied by a partial thermal decomposition producing monocationic ionic liquids, 1,3-dimethylimidazolium and 1-(2-propenyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)amides, as volatile products. This decomposition does not affect the vaporization characteristics of [C3 (MIm)2 2+ ][Tf2 N- ]2 , which were established to be as follows...
May 17, 2018: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/29508863/differences-in-the-behavior-of-dicationic-and-monocationic-ionic-liquids-as-revealed-by-time-resolved-fluorescence-nmr-and-fluorescence-correlation-spectroscopy
#12
Debashis Majhi, Sudipta Seth, Moloy Sarkar
With an aim to understand the behavior in terms of the intermolecular interactions, structure and dynamics of dicationic and monocationic ionic liquids (ILs), two imidazolium-based dicationic ionic liquids (DILs), 1,8-bis-(3-methylimidazolium-1-yl)octane bis-(trifluoromethylsulfonyl)amide ([C8 (mim)2 ][NTf2 ]2 ), 1,9-bis-(3-methylimidazolium-1-yl)nonane bis-(trifluoromethylsulfonyl)amide ([C9 (mim)2 ][NTf2 ]2 ), and one monocationic ionic liquid (MIL), 1-butyl-3-methyl imidazolium bis(trifluoromethylsulfonyl)amide ([C4 (mim)][NTf2 ]), have been investigated through combined fluorescence, electron paramagnetic resonance (EPR), NMR and fluorescence correlation spectroscopy (FCS)...
March 14, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29380017/dicationic-ionic-liquid-thermal-decomposition-pathways
#13
Rahul A Patil, Mohsen Talebi, Alain Berthod, Daniel W Armstrong
The rapid expansion in the study and use of ionic liquids (ILs) is a result of their unique properties including negligible volatility, high thermal stability, and ability to dissolve disparate compounds. However, because ILs have infinitely variable structures (often referred to as "tunability"), these properties can differ considerably. Herein, we focus on the thermal stability of 15 bis-/dicationic ionic liquids. Specifically, their thermal breakdown products are examined to determine the structural linkages, bonds, or atoms most susceptible to thermally induced changes and whether such changes occur before possible volatilization...
July 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29294183/synthesis-and-application-of-imidazolium-based-ionic-liquids-as-extraction-solvent-for-pretreatment-of-triazole-fungicides-in-water-samples
#14
Jiale Yang, Chen Fan, Dandan Kong, Gang Tang, Wenbing Zhang, Hongqiang Dong, You Liang, Deng Wang, Yongsong Cao
Five novel ionic liquids (ILs), 1,3-dibutylimidazolium bromide [BBMIm][Br], 1-pentyl-3-butylimidazolium bromide [BPMIm][Br], 1-hexyl-3-butylimidazolium bromide [BHMIm][Br], 1,1'-(butane-1,4-diyl)bis(3-butylimidazolium) bromide [C4 (BMIm)2 ][Br2 ], and 1,1'-(butane-1,4-diyl)bis(3-methylimidazolium) bromide [C4 (MIm)2 ][Br2 ], were prepared and used in situ to react with bis(trifluoromethane)sulfonamide lithium salt to extract the myclobutanil, tebuconazole, cyproconazole, and prothioconazole from water samples...
February 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29283554/nitrogen-doped-carbon-nanodots-ionogels-preparation-characterization-and-radical-scavenging-activity
#15
Carla Rizzo, Francesca Arcudi, Luka Đorđević, Nadka Tzankova Dintcheva, Renato Noto, Francesca D'Anna, Maurizio Prato
Hybrid diimidazolium-based ionogels were obtained by dispersing nitrogen-doped carbon nanodots (NCNDs) in ionic liquid (IL) solutions and by using dicationic organic salts as gelators. The properties of the NCND-ionogels were studied in terms of thermal stability, mechanical strength, morphology, rheological, and microscopic analyses. Insights into the formation of the hybrid soft material were attained from kinetics of sol-gel phase transition and from estimating the size of the aggregates, obtained from opacity and resonance light-scattering measurements...
February 27, 2018: ACS Nano
https://www.readbyqxmd.com/read/29272717/ecotoxicity-assessment-of-dicationic-versus-monocationic-ionic-liquids-as-a-more-environmentally-friendly-alternative
#16
M G Montalbán, G Víllora, P Licence
One of the reasons why ionic liquids have received growing interest from researchers is their environmentally interesting characteristics, such as their negligible vapour pressure and their good chemical and thermal properties. In particular, dicationic ionic liquids whose thermal and electrochemical stability is higher than that of monocationic ionic liquids have begun to gain attention during recent years. In this work, monocationic and dicationic ionic liquids were synthesized, characterized and tested for their toxicity, which was assessed using the luminescent bacterium Vibrio fischeri...
April 15, 2018: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/29253965/efficient-conversion-of-lignocellulosic-biomass-to-levulinic-acid-using-acidic-ionic-liquids
#17
Amir Sada Khan, Zakaria Man, Mohamad Azmi Bustam, Asma Nasrullah, Zahoor Ullah, Ariyanti Sarwono, Faiz Ullah Shah, Nawshad Muhammad
In the present research work, dicationic ionic liquids, containing 1,4-bis(3-methylimidazolium-1-yl) butane ([C4 (Mim)2 ]) cation with counter anions [(2HSO4 )(H2 SO4 )0 ], [(2HSO4 )(H2 SO4 )2 ] and [(2HSO4 )(H2 SO4 )4 ] were synthesised. ILs structures were confirmed using 1 H NMR spectroscopy. Thermal stability, Hammett acidity, density and viscosity of ILs were determined. Various types of lignocellulosic biomass such as rubber wood, palm oil frond, bamboo and rice husk were converted into levulinic acid (LA)...
February 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29236088/dicationic-imidazolium-based-ionic-liquid-coatings-on-zirconia-surfaces-physico-chemical-and-biological-characterization
#18
Pavan P K Sandhu, Izabelle M Gindri, Danyal A Siddiqui, Danieli C Rodrigues
In the present work, dicationic imidazolium-based ionic liquids (ILs) were investigated as multi-functional coatings on a zirconia (ZrO₂) surface to prevent biofilm formation and enhance the wear performance of zirconia while maintaining the material's compatibility with host cells. ILs containing phenylalanine and methionine were synthesized and deposited on zirconia. Intermolecular interactions driving IL deposition on zirconia were studied using X-ray photoelectron spectroscopy (XPS). Anti-biofilm activity and cell compatibility were evaluated in vitro after one and seven days, and wear performance was tested using a pin-on-disk apparatus...
December 13, 2017: Journal of Functional Biomaterials
https://www.readbyqxmd.com/read/29214537/branched-chain-dicationic-ionic-liquids-for-fatty-acid-methyl-ester-assessment-by-gas-chromatography
#19
Mohsen Talebi, Rahul A Patil, Leonard M Sidisky, Alain Berthod, Daniel W Armstrong
Twelve bis- or dicationic ionic liquids (ILs) including eight based on imidazolium, a single one based on phosphonium, and three based on pyrrolidinium cationic units were prepared with the bis(trifluoromethyl sulfonyl) imide anion. The two identical cationic moieties were attached by different alkyl spacers having three or five carbons and differing alkyl substituents attached to the spacer. The SLB-IL111 column, as the most polar commercial stationary phase known, was included in the study for comparison...
July 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29211071/molecular-dynamics-simulation-of-geminal-dicationic-ionic-liquids-c-n-mim-2-ntf-2-2-structural-and-dynamical-properties
#20
Majid Moosavi, Fatemeh Khashei, Elaheh Sedghamiz
In this work, the structural and dynamical properties of two imidazolium-based geminal dicationic ionic liquids (GDILs), i.e. [Cn (mim)2 ][NTf2 ]2 with n = 3 and 5, have been studied to obtain a fundamental understanding of the molecular basis of the macroscopic and microscopic properties of the bulk liquid phase. To achieve this purpose, molecular dynamics (MD) simulation, density functional theory (DFT) and atoms in molecule (AIM) methods were used. Interaction energies, charge transfers and hydrogen bonds between the cation and anions of each studied GDIL were investigated by DFT calculations and also AIM...
December 20, 2017: Physical Chemistry Chemical Physics: PCCP
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