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Easily Vaporizable Ionic Liquids – No Contradiction!
Author(s) -
Köckerling Martin,
Peppel Tim,
Thiele Philipp,
Verevkin Sergey P.,
Emel'yanenko Vladimir N.,
Samarov Artemiy A.,
Ruth Wolfgang
Publication year - 2015
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.201500391
Subject(s) - chemistry , ionic liquid , sublimation (psychology) , monoclinic crystal system , chloride , pyridinium , naphthalene , ion , ionic bonding , crystal structure , inorganic chemistry , crystallography , organic chemistry , catalysis , psychology , psychotherapist
It was a big surprise to see crystals of an ionic liquid (IL) forming by sublimation at room temperature. ILs are generally accepted to have negligible vapour pressures at elevated temperatures, making their sublimation or distillation very difficult. ILs that sublime easily contain silylimidazolium‐based cations. In order to establish the details of the unusual behaviour of this subclass of ILs, a combined spectroscopic, X‐ray crystallographic, physicochemical and theoretical characterization was performed. The results are compared with those of other easily vaporizable compounds, like ammonium chloride and naphthalene. The single‐crystal X‐ray structure analysis of one of these compounds, N ‐methyl‐ N′ ‐dimethyl(phenyl)silylimidazolium chloride (monoclinic, C 2/ c ), clearly shows the existence of isolated ions, demonstrating that the compound is an ionic liquid.