Tailored Ionic Liquids with Palladate Counterions

  • ChemPubSoc Europe Logo
  • Author: Chemistry – A European Journal
  • Published Date: 17 February 2019
  • Source / Publisher: Chemistry – A European Journal/Wiley-VCH
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
thumbnail image: Tailored Ionic Liquids with Palladate Counterions

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Ionic Liquids—salts with a melting point below 100 °C—can be modified in various ways. The so-called tunable aryl alkyl ionic liquids (TAAILs) are based on a cationic imidazolium core with different N-aryl rings and N-alkyl chains, as well as a counter-anion, all of which can be independently varied.


Thomas Strassner and colleagues, Technical University Dresden, Germany, have synthesized a range of TAAILs whose anion contains palladium atoms (example pictured). This type of metal-containing ionic liquid is readily available by dissolving a palladium chloride or bromide and the desired imidazolium salt in organic solvents such as dimethylsulfoxide (DMSO). This synthetic route tolerates a variety of reagent combinations.


Many of the synthesized salts are liquid at room temperature; others possess melting points well below 100 °C. The team verified the molecular structure of the ionic liquids using different analytical methods, including X-ray diffraction of their solid forms. The combination of the dissolution and physical properties of ionic liquids with the catalytic activity of palladium complexes could be very useful.


 

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