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Synthesis, Crystal Structures and Electrical Conductivities of the Ionic Liquid Compounds Butyldimethylimidazolium Tetrafluoroborate, Hexafluorophosphate and Hexafluoroantimonate
Author(s) -
Kölle Philipp,
Dronskowski Richard
Publication year - 2004
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200300940
Subject(s) - tetrafluoroborate , hexafluorophosphate , ionic liquid , chemistry , counterion , melting point , polar , inorganic chemistry , crystal structure , ionic bonding , crystallography , ion , organic chemistry , physics , astronomy , catalysis
The crystal structures of three very low‐melting ionic liquid (IL) salts containing the 1‐butyl‐2,3‐dimethylimidazolium cation and the fluoro anions BF 4 − , PF 6 − and SbF 6 − are reported. These are considered model compounds for ambient temperature ionic liquids, which are currently being explored as solvents for various types of synthetic reactions. All three compounds adopt significantly different structures in the solid state, highlighting the influence of counterion size in a series comprising a common cation. The crystal structures are discussed with respect to the possible existence of polar and non‐polar domains, which are considered to be involved with the solvation of polar and non‐polar substrates. The melting points of all three compounds are within the range 40−45 °C. A comparative measurement of conductivities of the molten salts in the vicinity of 20−50 °C has been made, including the new IL 1‐allyl‐2,3‐dimethylimidazolium tetrafluoroborate and the widely applied 1‐butyl‐3‐methylimidazolium tetrafluoroborate ( BMIM BF 4 ). (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2004)