1-Butyl-3-Methylimidazolium Hexafluorophosphate

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Siddharth Pandey - One of the best experts on this subject based on the ideXlab platform.

  • solvatochromic absorbance probe behavior within 1 butyl 3 methylimidazolium Hexafluorophosphate propylene carbonate preferential solvation or solvent solvent interaction
    Chemical Engineering Journal, 2009
    Co-Authors: Shruti Trivedi, Abhra Sarkar, Siddharth Pandey
    Abstract:

    Abstract Physicochemical properties of ionic liquids (ILs) can be favorably modified by addition of appropriate cosolvents. Solvatochromic absorbance probes are used to assess physicochemical properties of the mixture of a common IL 1-Butyl-3-Methylimidazolium Hexafluorophosphate ([bmim][PF6]) and propylene carbonate. Parameter E T N obtained from electronic absorbance of Reichardt's betaine dye within the mixture is observed to be higher than that predicted from ideal additive behavior. Absorbance from N,N-diethyl-4-nitroaniline and 4-nitroaniline in concert with absorbance from Reichardt's dye is used to obtain dipolarity/polarizability (π*), hydrogen-bond donating (HBD) acidity (α), and hydrogen-bond accepting (HBA) basicity (β) of the mixture. While π* and α of the mixture are observed to be higher than those expected from ideal additive behavior, β is observed to be lower. Solvatochromic absorbance probe behavior suggests solute-specific preferential solvation; FTIR absorbance of the mixture implies negligible specific solvent–solvent interaction(s) within the mixture. Combined nearly ideal binary solvent/Redlich–Kister (CNIBS/R–K) equation is demonstrated to predict the solvatochromic parameters satisfactorily.

  • multiprobe spectroscopic evidence for hyperpolarity within 1 butyl 3 methylimidazolium Hexafluorophosphate mixtures with tetraethylene glycol
    Journal of Physical Chemistry B, 2008
    Co-Authors: Abhra Sarkar, Shruti Trivedi, Gary A Baker, Siddharth Pandey
    Abstract:

    A hybrid, potentially green solvent system composed of tetraethylene glycol (TEG) and the ionic liquid 1-Butyl-3-Methylimidazolium Hexafluorophosphate ([bmim][PF6]) was investigated across all mole fractions with regard to the solvent properties of the mixture. For this purpose, a suite of absorbance- and fluorescence-based solvatochromic probes were utilized to explore solute−solvent and solvent−solvent interactions existing within the [bmim][PF6] + TEG system. These studies revealed an interesting and unusual synergistic solvent effect. In particular, a remarkable “hyperpolarity” was observed in which the ET value, comprising dipolarity/polarizability and hydrogen bond donor (HBD) acidity contributions, at intermediate mole fractions of the binary mixture well exceeded that of the most polar pure component (i.e., [bmim][PF6]). Independently determined dipolarity/polarizability (π*) and HBD acidity (α) Kamlet-Taft values for the [bmim][PF6] + TEG mixtures were also observed to be anomalously high at inte...

  • unusual solvatochromism within 1 butyl 3 methylimidazolium Hexafluorophosphate poly ethylene glycol mixtures
    Journal of Physical Chemistry B, 2008
    Co-Authors: Abhra Sarkar, Shruti Trivedi, Siddharth Pandey
    Abstract:

    Hybrid “green” solvent systems composed of room-temperature ionic liquids (ILs) and poly(ethylene glycols) (PEGs) may have enormous future potential. Solvatochromic absorbance probe behavior is used to assess the physicochemical properties of the mixture composed of IL 1-Butyl-3-Methylimidazolium Hexafluorophosphate ([bmim][PF6]) and PEG (average molecular weights of 200, 400, 600, and 1500) at ambient conditions. Lowest energy intramolecular charge-transfer absorbance maxima of a betaine dye, i.e., ETN, indicates the dipolarity/polarizability and/or hydrogen-bond donating (HBD) acidity of the [bmim][PF6] + PEG mixtures to be even higher than that of neat [bmim][PF6], the solution component with higher dipolarity/polarizability and/or HBD acidity. Dipolarity/polarizability (π*) obtained separately from the electronic absorbance response of probe N,N-diethyl-4-nitroaniline shows a trend similar to ETN thus confirming the unusually high dipolarity/polarizability of the [bmim][PF6] + PEG mixtures. Similar to...

  • solvatochromic probe behavior within ternary room temperature ionic liquid 1 butyl 3 methylimidazolium Hexafluorophosphate ethanol water solutions
    Journal of Physical Chemistry B, 2003
    Co-Authors: Kristin A Fletcher, Siddharth Pandey
    Abstract:

    The solvatochromic probe behavior within ternary BMIMPF6 + ethanol + water systems were investigated using four solvatochromic probes:  pyrene, 1,3-bis(1-pyrenyl)propane, 1-pyrenecarboxaldehyde, an...

Ana Rodriguez - One of the best experts on this subject based on the ideXlab platform.

Christopher S Brazel - One of the best experts on this subject based on the ideXlab platform.

Robin D Rogers - One of the best experts on this subject based on the ideXlab platform.

  • Ionic liquids are not always green: hydrolysis of 1-Butyl-3-Methylimidazolium Hexafluorophosphate
    Green Chemistry, 2003
    Co-Authors: Richard P Swatloski, John D. Holbrey, Robin D Rogers
    Abstract:

    1-Butyl-3-Methylimidazolium fluoride hydrate has been identified crystallographically as a decomposition product created during purification of the hydrophobic ionic liquid 1-Butyl-3-Methylimidazolium Hexafluorophosphate. This highlights the need to treat ionic liquids much as one would any other research chemical with potentially hazardous properties, unknown toxicity and/or stability, particularly when searching for ‘green solvents’.

  • application of ionic liquids as plasticizers for poly methyl methacrylate
    Chemical Communications, 2002
    Co-Authors: Mark P Scott, John D. Holbrey, Michael G Benton, Christopher S Brazel, Jimmy W Mays, Robin D Rogers
    Abstract:

    The room temperature ionic liquid, 1-Butyl-3-Methylimidazolium Hexafluorophosphate, [C4mim][PF6] was found to be an efficient plasticizer for poly(methyl methacrylate), prepared by in situ radical polymerization in the ionic liquid medium; the polymers have physical characteristics comparable with those containing traditional plasticizers and retain greater thermal stability.

John D. Holbrey - One of the best experts on this subject based on the ideXlab platform.

  • Ionic liquids are not always green: hydrolysis of 1-Butyl-3-Methylimidazolium Hexafluorophosphate
    Green Chemistry, 2003
    Co-Authors: Richard P Swatloski, John D. Holbrey, Robin D Rogers
    Abstract:

    1-Butyl-3-Methylimidazolium fluoride hydrate has been identified crystallographically as a decomposition product created during purification of the hydrophobic ionic liquid 1-Butyl-3-Methylimidazolium Hexafluorophosphate. This highlights the need to treat ionic liquids much as one would any other research chemical with potentially hazardous properties, unknown toxicity and/or stability, particularly when searching for ‘green solvents’.

  • application of ionic liquids as plasticizers for poly methyl methacrylate
    Chemical Communications, 2002
    Co-Authors: Mark P Scott, John D. Holbrey, Michael G Benton, Christopher S Brazel, Jimmy W Mays, Robin D Rogers
    Abstract:

    The room temperature ionic liquid, 1-Butyl-3-Methylimidazolium Hexafluorophosphate, [C4mim][PF6] was found to be an efficient plasticizer for poly(methyl methacrylate), prepared by in situ radical polymerization in the ionic liquid medium; the polymers have physical characteristics comparable with those containing traditional plasticizers and retain greater thermal stability.

  • conventional free radical polymerization in room temperature ionic liquids a green approach to commodity polymers with practical advantages
    Chemical Communications, 2002
    Co-Authors: John D. Holbrey, Christopher S Brazel, Jimmy W Mays, Kunlun Hong, Hongwei Zhang, Ann E Visser, Matthew W Reichert
    Abstract:

    Free-radical polymerization of methyl methacrylate and styrene using conventional organic initiators in the room temperature ionic liquid, 1-Butyl-3-Methylimidazolium Hexafluorophosphate ([C4mim][PF6]) is rapid and produces polymers with molecular weights up to 10× higher than from benzene; both polymerization and isolation of products were achieved without using VOCs, offering economic as well as environmental advantages.

  • solubilization of an ionic liquid 1 butyl 3 methylimidazolium Hexafluorophosphate in a surfactant water system
    Journal of Dispersion Science and Technology, 2000
    Co-Authors: Stig E Friberg, John D. Holbrey, Kenneth R Seddon, Qi Yin, Florentina Pavel, Raymond A Mackay, Patricia A Aikens
    Abstract:

    Abstract The amphiphilic association structures were determined in the system; water, Laureth 4 (approximately C12(EO) 4), and the ionic liquid l-butyl-3-methylimidazolium Hexafluorophosphate ([bmim[PF6]), using visual observation and small angle x-ray diffraction. The system showed a lamellar liquid crystal solubilizing the ionic liquid ([bmim[PF6]) to a maximum of 15%, an isotropic surfactant solution dissolving the ionic liquid to a maximum of 39%, an isotropic ionic liquid solution with less than 0.5% of water and surfactant and finally, an aqueous solution with only traces of surfactant and ionic liquid. The small angle x-ray diffraction results showed the ionic liquid to be solubilized into the lamellar liquid crystal without changing the dimensions of the amphiphile layer or the interlayer spacing dependence on the water content.