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Green Chemistry 01/2013; 15(2):525-534. · 6.32 Impact Factor
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ABSTRACT: Novel protic ionic liquids (PILs) based on a tributyl phosphonium cation have been synthesised and characterised, revealing that the phosphonium based ILs show high thermal stability, high ionic conductivity and facile proton reduction compared to the corresponding ammonium based ILs.
Chemical Communications 09/2011; 47(42):11612-4. · 6.17 Impact Factor
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ABSTRACT: A novel organic ionic plastic crystal (OIPC) electrolyte based on a quaternary ammonium cation and the triflate anion has been synthesized, which shows fast proton transport and high thermal stability in the solid state when doped with triflic acid.
Chemical Communications 06/2011; 47(22):6401-3. · 6.17 Impact Factor
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ABSTRACT: We describe hydrated ionic liquids which have an intrinsic proton buffering action and hence an ability to control proton activity in an ionic medium.
Chemical Communications 11/2010; 46(41):7703-5. · 6.17 Impact Factor
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ABSTRACT: Mixtures of the plastic crystal material choline dihydrogen phosphate [Choline][DHP] and phosphoric acid, from 4.5 mol% to 18 mol% H(3)PO(4), were investigated and shown to have significantly higher proton conductivity compared to the pure [Choline][DHP]. This was particularly evident from the electrochemical hydrogen reduction reaction and the proton NMR diffusion measurements, in addition to ionic conductivity measured from the impedance spectroscopy. The ionic conductivity was observed to increase by more than an order of magnitude in phase I (i.e. the highest temperature solid phase in [Choline][DHP]) reaching up to 10(-2) S cm(-1). The multinuclear NMR spectroscopy data suggest that, at least on the timescale of the NMR measurement, the H(+) cations and [DHP] anions are equivalent in both phases. The pulsed field gradient NMR diffusion measurements of the 18 mol% acid sample indicate that all three ions are mobile, however the H(+) diffusion coefficient is an order of magnitude higher than for the [Choline] cation or the [DHP] anion, and therefore conduction in these materials is dominated by proton conductivity. The thermal stability, as measured by TGA, is unaffected with increasing acid additions and remains high; i.e. no significant mass loss below 200 °C.
Physical Chemistry Chemical Physics 10/2010; 12(37):11291-8. · 3.57 Impact Factor
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ABSTRACT: A series of novel choline based salts, some of which can be described as ionic liquids, are prepared and evaluated for their biocompatibility; when combined with collagenous biomaterials they exhibit good cell viability and adhesion properties as required for biomedical implant applications.
Chemical Communications 01/2010; 46(2):294-6. · 6.17 Impact Factor
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ABSTRACT: The exothermic behaviour and intrinsic safety of a number of ionic liquids being considered for battery and solar cell applications have been investigated at elevated temperatures by analysing data from accelerated rate calorimetric (ARC) studies.
Chemical Communications 11/2009; · 6.17 Impact Factor
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ABSTRACT: A novel self-polymerised ionic liquid (IL) gel was prepared at room temperature (RT), without light or heat or addition of initiator, using a new IL, choline formate (CF), and 2-hydroxyethyl methacrylate (HEMA).
Chemical Communications 07/2009; · 6.17 Impact Factor
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ABSTRACT: A controlled cationic polymerization of styrene has been achieved using bisoxalatoboric acid (HBOB) as an initiator in a room temperature ionic liquid (IL) under mild reaction conditions to obtain polymers of low molecular weights and narrow polydispersity. HBOB represents a relatively easily handled cationic initiator as compared to those often used in cationic polymerization reactions. The concentration of HBOB was optimized, and it was found that the molecular weights of these polymers increased with decreasing HBOB concentration. Studies were performed with different water contents in the reaction mixture to gauge the water tolerance above which the polymerization is inhibited. Experiments were also carried out with other organoborate acids, and it was found that the trend in yields followed trends in Bronsted acidity. The efficiency of different ILs as reaction solvents is also discussed.
08/2007;
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ABSTRACT: The telomerization reaction between acrylonitrile (AN) and trichloroacetyl chloride (TCAC), which is one of the important intermediate steps in the manufacture of a commercial pesticide compound, often results in high temperature and pressure excursions if proper controls are not applied. Hence there is a need for upgrading the process safety of this reaction. Ionic liquid solvents, by virtue of their relatively low volatility and high thermal stability in some cases, have been investigated in this study as a means of improving intrinsic process saftey. Adiabatic calorimetry is a useful analytical technique to monitor the temperature and presssure excursions in reactions, and this technique is applied here for the first time to the telomerization reaction.
01/2007;
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ABSTRACT: The azo dyes are commonly used in the leather and textile industries as they are quite versatile in nature. However, they are neither totally utilised during the process, nor are they recovered at the end of the process. In fact, in the leather industry, typically about 10-15% of the dye is discharged with the effluent creating both environmental and economic issues. Hence, there is a need to remove the residual dye from the large volume of aqueous effluent. In this study, for the first time, azo dyes employed in the leather industry have been successfully extracted into a neutral ionic liquid, with an extraction efficiency of 98%, potentially providing a method of minimizing pollution of waste-waters. The extraction of the dye into the ionic liquid also provides a potential analytical approach to determination of these dyes.
Talanta 08/2006; 69(5):1059-62. · 3.79 Impact Factor
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Angewandte Chemie International Edition 11/2004; 43(40):5363-6. · 13.45 Impact Factor
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ABSTRACT: For the first time, living cationic polymerisation of styrene has been carried out in room temperature ionic liquids under mild reaction conditions and using mild acid catalysts (e.g. organoborate acids) to obtain polymers of narrow polydispersity.
Chemical Communications 04/2004; · 6.17 Impact Factor
