Surface orientation of 1-methyl-, 1-ethyl-, and 1-butyl-3-methylimidazolium methyl sulfate as probed by sum-frequency generation vibrational spectroscopy

Article Abstract:

The surface orientation of ionic liquids, 1,3-dimethylimidazolium methyl sulfate, [MMIM][MS], 1-ethyl-3-methylimidazolium methyl sulfate [EMIM][MS], and 1-butyl-3-methylimidazolium methylsulfate, [BMIM][MS] at the gas-liquid interface was determined. The observations exhibited that both ions are present at the first layer of the gas-liquid interface and the alkyl chains are extended towards the gas state and far away from the liquid state.

Mechanical properties

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Molecular dynamics simulations of methane hydrate using polarizable force fields

Article Abstract:

The molecular dynamics simulations of methane hydrate via the polarizable AMOEBA and COS/G2 force fields revealed the vibrational spectrum of methane hydrate in the water librational region to be more sensitive to the details of the force fields with significantly different spectra observed for the AMOEBA and COS/G2 polarizable models.

Chemical properties

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Sum frequency generation studies of ammonium and pyrrolidinium ionic liquids based on the bis-trifluoromethanesulfonimide anion

Article Abstract:

Sum frequency generation vibrational spectroscopy is used for studying the gas-liquid interface of room-temperature ammonium and pyrrolidinium ionic liquids. The chain length dependence studies have shown that the contribution of the N[C[H.sub.3] vibration is masked by the chain for lengths of four carbons and more.

Thermal properties, Ammonium compounds, Ammonium chloride, Ammonium paratungstate, Ammonium salts, Polarization (Light)

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