16836-76-3Relevant articles and documents
Vaporization of protic ionic liquids studied by matrix-isolation fourier transform infrared spectroscopy
Horikawa, Mami,Akai, Nobuyuki,Kawai, Akio,Shibuya, Kazuhiko
, p. 3280 - 3287 (2014)
Several protic ionic liquids (PILs) with a wide range of pKa differences (ΔpKa) between the parent acid and base molecules were thermally evaporated in vacuum, trapped on a CsI plate by a cryogenic neon matrix-isolation method, and studied by Fourier transform infrared spectroscopy and density functional theory calculations. The parent neutral molecules and proton-transferred cation-anion pair species were identified as chemical components evaporated from the PILs with lower and higher ΔpKa values, respectively. The ΔpKa-dependent vaporization mechanism is discussed in terms of thermodynamic equilibrium between acid-base and anion-cation systems in the liquid phase.
Diazobicyclo[5.4.0]undec-7ene-ium and tetramethyl guanidium based ionic liquids enhanced thermal stability of xylose reductase at extreme pH through specific ion effect
Malla, Shwethashree,Jisha,Gardas, Ramesh L.,Gummadi, Sathyanarayana N.
, (2021/02/02)
As part of sustainable industrial bioprocesses, conversion of xylose from lignocellulosic biomass residues has gained attention and importance over recent decades. Xylitol is one such imperative metabolites which can be obtained in a single step conversion from xylose through enzymatic process employing xylose reductase. Xylose reductase from Debaryomyces nepalensis NCYC 3413 (DnXR) has proved to be potential candidate for this purpose due to its industrially superior characteristics compared to the enzymes from other sources. Ionic liquids have applications in various fields, especially in biotechnology, as a replacement of organic solvents as well as for efficient processes and improvement of existing process by enhancing the stability of biomolecules. In this study, effect of diazobicyclo[5.4.0]undec-7ene-ium (DBU), tetramethyl guanidium (TMG) based and Cholinium based ionic liquids on the activity and stability of DnXR was investigated in terms of thermodynamic parameters, half-life time as well as the intrinsic tryptophan fluorescence at pH 5.0, 7.0 and 10.0. [TMG][But] and [DBU][Acetate] were effective in improving the enzyme activity at pH 10.0 by 72% and 58%. [TMG][Acetate] increased the functional stability at pH 10.0 by 10-fold while maintaining the activity same as control and [DBU][Chloride] enhanced the half-life time by 8.5-fold at pH 5.0.
Ionic liquid assisted silver-catalyzed one-pot A3-coupling reactions for the synthesis of propargylamines
Zhu, Anlian,Du, Chunyan,Zhang, Yue,Li, Lingjun
, p. 289 - 293 (2019/02/06)
A series of ionic liquids with different cations and anions were synthesized and their performances for the silver catalyzed one-pot A3-coupling reactions were investigated. The selection showed that the combination of AgNO3 and ioni
Superbase ionic liquids for effective cellulose processing from dissolution to carbonisation
Kuzmina, Olga,Bhardwaj, Jyoti,Vincent, Sheril Rizal,Wanasekara, Nandula Dasitha,Kalossaka, Livia Mariadaria,Griffith, Jeraime,Potthast, Antje,Rahatekar, Sameer,Eichhorn, Stephen James,Welton, Tom
supporting information, p. 5949 - 5957 (2017/12/26)
A range of superbase derived ionic liquids (SILs) was synthesised and characterised. Their ability to dissolve cellulose and the characteristics of the produced fibres were correlated to their specific structural and solvent properties. 17 ionic liquids (ILs) (including 9 novel) were analysed and six ILs were selected to produce fibres: 1-ethyl-3-methylimidazolium acetate [C2C1im][OAc], 1-ethyl-3-methylimidazolium diethyl phosphate [C2C1im][DEP] and the SILs 1-ethyl-1,8-diazabicyclo[5.4.0]undec-7-enium diethylphosphate [DBUEt][DEP], 1,8-diazabicyclo[5.4.0]undec-7-enium acetate [DBUH][OAc], 1,5-diazabicyclo[4.3.0]non-5-enium acetate [DBNH][OAc] and 1-ethyl-1,5-diazabicyclo[4.3.0]non-5-enium diethylphsophate [DBNEt][DEP]. The mechanical properties of these fibres were investigated. The obtained fibres were then carbonised to explore possible application as carbon fibre precursors. The fibres obtained using a mixture of 1,5-diazabicyclo[4.3.0]non-5-enium based SILs with acetate and hexanoate anions (9 : 1), [DBNH][OAc][Hex], showed a promising combination of strength, stiffness and strain at failure values for applications in textiles and fibre reinforcement in renewable composites. Using Raman spectroscopy it is demonstrated that these fibres exhibit a relatively high degree of structural order, with fewer defects than the other materials. On the other hand, analogous fibres based on imidazolium cation with acetate and hexanoate anions (9 : 1), [C2C1im][OAc][Hex] showed a decline in the quality of the produced fibres compared to the fibres produced from [C2C1im][OAc], [C2C1im][DEP] or [DBNH][OAc][Hex].
