Reactions of Ions with Ionic Liquid Vapors by Selected-Ion Flow Tube Mass Spectrometry
ENGINEERING RESEARCH AND CONSULTING INC (ERC INC) EDWARDS AFB CA
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Room temperature ionic liquids exert vanishingly small vapor pressures under ambient conditions. Under reduced pressure, certain ionic liquids have demonstrated volatility and they are thought to vaporize as intact cation-anion ion pairs. However, ion pair vapors are difficult to detect because their concentration is extremely low under these conditions. In this letter, we report the products of reacting NO, NH4, NO3-, and O2- with vaporized aprotic ionic liquids in their intact ion pair form. Ion pair fragmentation to the cation or anion, as well as ion exchange and ion addition processes are observed by selected ion flow tube mass spectrometry. Free energies of the reactions involved are determined by ab initio quantum mechanical calculations, indicating that ion exchange or ion addition are energetically more favorable than charge transfer processes for the systems investigated here.
- Physical Chemistry
- Test Facilities, Equipment and Methods
- Atomic and Molecular Physics and Spectroscopy