284049-75-8Relevant articles and documents
Viscosities and conductivities of 1-butyl-3-methylimidazolium carboxylates ionic liquids at different temperatures
Xu, Airong,Zhang, Yajuan,Li, Zhiyong,Wang, Jianji
, p. 3102 - 3108 (2012)
In recent years, 1-butyl-3-methylimidazolium carboxylates ionic liquids (ILs) have been reported to be powerful solvents for the dissolution of cellulose and chitosan. However, very few studies have been conducted to investigate their basic physicochemical properties such as viscosity and conductivity. In this work, we have synthesized 1-butyl-3-methylimidazolium carboxylates ILs: 1-butyl-3-methylimidazolium formate ([C4mim][HCOO]) , 1-butyl-3-methylimidazolium acetate ([C4mim][CH3COO]), 1-butyl-3-methylimidazolium propionate ([C4mim][CH3CH 2COO]), and 1-butyl-3-methylimidazolium butyrate ([C 4mim][CH3(CH2)2COO]), in which the alkyl chain length in the anions is varied. The experimental viscosities (η) and conductivities (σ) for these ILs have been determined at different temperatures, and well correlated by the Vogel-Fulcher-Tammann (VFT) equation. Walden plots indicate an increase in ion pairs and/or ionic aggregates in the ILs with increasing alkyl chain length. Furthermore, the effect of alkyl chain length in carboxylate anions on viscosities and conductivities of the ILs has been discussed in light of the contribution from van der Waals interactions. Such knowledge would be useful for the understanding of the structure-property relationship of ILs and for the rational design of novel task-specific ILs.
Salting-out effect of ionic liquids on poly(propylene glycol) (PPG): Formation of PPG + ionic liquid aqueous two-phase systems
Wu, Changzeng,Wang, Jianji,Pei, Yuanchao,Wang, Huiyong,Li, Zhiyong
, p. 5004 - 5008 (2010)
In the present work, aqueous poly(propylene glycol) (PPG) solution was separated into aqueous two-phase systems (ATPSs) in the presence of ionic liquid 1-allyl-3-methylimidazolium chloride ([Amim]Cl), 1-butyl-3-methylimidazolium acetate ([C4mim]Ac), or 1-butyl-3-methylimidazolium chloride ([C 4mim]Cl). The top phase was PPG-rich, whereas the bottom phase was ionic liquid (IL)-rich. Liquid-liquid equilibrium data for the ATPSs and the salting-out coefficients of the ILs have been determined at 298.15 K and atmospheric pressure. It was shown that the binodal curves and the tie-lines could be described by a three-parameter equation and the Othmer-Tobias and Bancroft equations, respectively. The salting-out ability of the ILs on PPG was found to follow the order: [Amim]Cl > [C4mim]Ac > [C 4mim]Cl > [C4mim][BF4]. Since PPG is a thermo-sensitive polymer and can be recovered simply by heating, these novel ATPSs are expected to have applications in the recycling and/or enrichment of hydrophilic ILs from aqueous solutions.
Effect of alkyl chain length in anion on dissolution of cellulose in 1-butyl-3-methylimidazolium carboxylate ionic liquids
Xu, Airong,Zhang, Yibo,Lu, Weiwei,Yao, Kaisheng,Xu, Hang
, p. 211 - 214 (2014)
In recent years, 1-butyl-3-methylimidazolium carboxylate ionic liquids (ILs) have been reported to be powerful solvents for cellulose. However, little is known for the influence of the chain length in carboxylate anion on the solubility of cellulose. Therefore, in this work, we have synthesized 1-butyl-3-methylimidazolium carboxylate ILs including 1-butyl-3- methylimidazolium formate ([C4mim][HCOO]), acetate ([C 4mim][CH3COO]), propionate ([C4mim][CH 3CH2COO]) and butyrate ([C4mim][CH 3(CH2)2COO]), in which the alkyl chain length in the carboxylate anion is being varied. Solubilities of cellulose in the ILs have been determined experimentally at 70 °C. The effect of the chain length in carboxylate anion on the solubility of cellulose has been estimated and investigated by 1H NMR. Meanwhile, the regenerated cellulose from the ILs were investigated by scanning electron micrograph (SEM), thermogravimetric analysis (TGA) and Fourier transform infrared (FTIR) spectroscopy. Such knowledge would enhance our understanding of the design of novel ILs for cellulose.
Effects of anionic structure and lithium salts addition on the dissolution of cellulose in 1-butyl-3-methylimidazolium-based ionic liquid solvent systems
Xu, Airong,Wang, Jianji,Wang, Huiyong
, p. 268 - 275 (2010)
Cellulose is the most abundant biorenewable and biodegradable resource on the earth. However, the extent of its application is limited due to its inefficient dissolution in solvents. Thus, the development of new cellulose solvents continues to be an activ
Interactions of 1-butyl-3-methylimidazolium carboxylate ionic liquids with glucose in water: A study of volumetric properties, viscosity, conductivity and NMR
Zhuo, Kelei,Chen, Yujuan,Chen, Jing,Bai, Guangyue,Wang, Jianji
, p. 14542 - 14549 (2011)
Extensive applications of ionic liquids (ILs) may result in their accumulation in the ecological environment and organisms. Although ILs are popularly called "green solvents", their toxicity, in fact, has been exhibited. Therefore the interaction of ILs with biomolecules is a cutting-edge research subject. Herein, the interactions of 1-butyl-3-methylimidazolium carboxylate ionic liquids ([C4mim][HCOO], [C4mim][CH 3COO] and [C4mim][CH3CH2COO]) with glucose in water were studied for their volumetric properties, viscosity, conductivity and NMR spectra. Limiting apparent molar volumes (V0Φ,IL), viscosity B-coefficients, limiting molar conductivities (Λ0) and Walden products (Λ0η0) were evaluated for the ILs in glucose + water solutions. Volumetric interaction parameters were also obtained from the transfer volumes of the ionic liquids. The contributions of the solvent properties (B1) and the ionic liquid-solvent interactions (B2) to the B-coefficient were extracted, together with molar activation energies (Δμ0≠IL) of the ionic liquids for viscous flow of the aqueous glucose + IL solution. In addition, the 13C and 1H NMR spectra of methyl β-d-glucopyranoside and ILs in β-d-glucopyranoside + IL + D2O were studied. The NMR results show that no special and strong interactions were observed between glucopyranoside and the ILs. However, it was confirmed that the H2 on the imidazolium ring has more activity (acidity) than atoms H4 and H5. The macro-properties and their changes were also discussed in terms of the size, structure and solvation of the ILs and glucose. the Owner Societies 2011.
Binary mixtures of ionic liquids-DMSO as solvents for the dissolution and derivatization of cellulose: Effects of alkyl and alkoxy side chains
Ferreira, Daniela C.,Oliveira, Mayara L.,Bioni, Thais A.,Nawaz, Haq,King, Alistair W.T.,Kilpel?inen, Ilkka,Hummel, Michael,Sixta, Herbert,El Seoud, Omar A.
, p. 206 - 214 (2019)
The efficiency of mixtures of ionic liquids (ILs) and molecular solvents in cellulose dissolution and derivatization depends on the structures of both components. We investigated the ILs 1-(1-butyl)-3-methylimidazolium acetate (C4MeImAc) and 1-(2-methoxyethyl)-3-methylimidazolium acetate (C3OMeImAc) and their solutions in dimethyl sulfoxide, DMSO, to assess the effect of presence of an ether linkage in the IL side-chain. Surprisingly, C4MeImAc-DMSO was more efficient than C3OMeImAc-DMSO for the dissolution and acylation of cellulose. We investigated both solvents using rheology, NMR spectroscopy, and solvatochromism. Mixtures of C3OMeImAc-DMSO are more viscous, less basic, and form weaker hydrogen bonds with cellobiose than C4MeImAc-DMSO. We attribute the lower efficiency of C3OMeImAc to “deactivation” of the ether oxygen and C2–H of the imidazolium ring due to intramolecular hydrogen bonding. Using the corresponding ILs with C2–CH3 instead of C2–H, namely, 1-butyl-2,3-dimethylimidazolium acetate (C4Me2ImAc) and 1-(2-methoxyethyl)-2,3-dimethylimidazolium acetate (C3OMe2ImAc) increased the concentration of dissolved cellulose; without noticeable effect on biopolymer reactivity.
Electrochemical and spectroscopic study of vanadyl acetylacetonate–ionic liquids interactions
Guglielmero,Langroudi, Mo. Meskinfam,Khatib, M. Al,de Oliveira, M. Aysla Costa,Mecheri,De Leo,Mezzetta,Guazzelli,Giglioli,Epifanio, A. D',Pogni,Chiappe,Pomelli
, (2021/02/16)
A panel of ionic liquids has been synthesized and their effect on the vanadyl acetylacetonate solubility in acetonitrile has been firstly assessed. 1-Butyl-3-methylimidazolium acetate showed an unprecedented result, increasing the VO(acac)2 solubility in acetonitrile of more than one magnitude order (from 0.06 M to 1.1 M) opening new interesting horizons for the possible applications of this vanadium complex. The electrochemical effect of the considered ionic liquids has been subsequently investigated through cyclic voltammetry and linear sweep voltammetry with rotating disk electrode, determining diffusion coefficient and kinetic current of VO(acac)2 in the considered media. In order to achieve a deeper understanding on the examined systems, VO(acac)2 solutions in acetonitrile ILs were eventually studied through IR, UV–vis, and EPR spectroscopies, finding evidences, corroborated by DFT studies, of the formation of strong adducts between VO(acac)2 and ILs.
Double-water-phase ionic liquid synthesis method
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Paragraph 0041-0043, (2020/11/23)
The invention belongs to the field of chemical synthesis, and discloses a double-water-phase ionic liquid synthesis method, which comprises: dissolving a cation precursor [Cat]+[X]- and an anion precursor [M]+[A]- in water, adding a layering reagent, carrying out a stirring reaction and standing treatment to obtain two layers of layered liquids, and carrying out liquid separation to prepare an ionic liquid [Cat]+[A]-, wherein the layering reagent is selected from at least one of sugar, sugar alcohol or amino acid. The method relates to the use of a layering reagent, realizes a more universal new ionic liquid synthesis method, does not require an inorganic salt reactant to have very high water solubility and avoids the use of harmful substances such as an organic solvent or a silver salt and the like in the traditional method; therefore, the method is very environment-friendly, and the layering reagent can be repeatedly used; in addition, the purity of the prepared ionic liquid [Cat]+[A]- is greater than 98%.
