Tetraalkylphosphonium polyoxometalate ionic liquids: novel, organic-inorganic hybrid materials.
Pairing of a Keggin or Lindqvist polyoxometalate (POM) anion with an appropriate tetraalkylphosphonium cation is shown to yield the first members of a new family of ionic liquids (ILs). Detailed characterization of one of them, an ambient-temperature "liquid POM" comprising the Lindqvist salt of the trihexyl(tetradecyl) phosphonium cation, by voltammetry, viscometry, conductimetry, and thermal analysis indicates that it exhibits conductivity and viscosity comparable to those of the one previously described inorganic-organic POM-IL hybrid but with substantially improved thermal stability.
Rickert
Paul G
PG
Chemistry Division, Argonne National Laboratory, Argonne, Illinois 60439, USA.
Antonio
Mark R
MR
Firestone
Millicent A
MA
Kubatko
Karrie-Ann
KA
Szreder
Tomasz
T
Wishart
James F
JF
Dietz
Mark L
ML
D002152:Calorimetry, Differential Scanning; D004563:Electrochemistry; D052578:Ionic Liquids / Q000138:chemical synthesis / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D009943:Organophosphorus Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D000644:Quaternary Ammonium Compounds / Q000737:chemistry; D053838:Scattering, Small Angle; D013696:Temperature; D013997:Time Factors; D017973:Tungsten Compounds / Q000737:chemistry; D014783:Viscosity; D014961:X-Ray Diffraction
D052578:Ionic Liquids; D009942:Organometallic Compounds; D009943:Organophosphorus Compounds; D000644:Quaternary Ammonium Compounds; D017973:Tungsten Compounds; C025399:sodium tungstate(VI); C009405:tetrabutylammonium