AI Article Synopsis
- The room temperature ionic liquid n-butyl-3-methylpyridinium dicyanamide has been analyzed for its physicochemical properties, including density and viscosity, across various temperatures.
- Results led to the calculation of key properties like coefficients of thermal expansion and entropies, providing insights into the influence of anionic structure on liquid behavior.
- Additionally, the study explored thermal properties and fragility behavior of pyridinium-based ionic liquids, contributing to the understanding of ion behavior in these fluids.
Article Abstract
The room temperature ionic liquid n-butyl-3-methylpyridinium dicyanamide has been characterized. Physicochemical properties such as density, speed of sound, refractive index, surface tension, and kinematic viscosity of the studied liquid have been experimentally measured in a wide range of temperatures. From results, coefficients of thermal expansion, molar refractions, dynamic viscosities and entropies and enthalpies of surface formation per unit surface area at the studied temperatures have been derived. We have analyzed the achieved results for evaluating the effect of the anionic structure in these properties, getting interesting results which lead us to a better understanding of the behavior of the ions in the fluids. Moreover, thermal properties of several pyridinium-based ionic liquids have been investigated. Finally, from both dynamic viscosity values and glass transition temperature of the studied liquids, a detailed analysis of the behavior in fragility terms has been performed.
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Article Synopsis
- The room temperature ionic liquid n-butyl-3-methylpyridinium dicyanamide has been analyzed for its physicochemical properties, including density and viscosity, across various temperatures.
- Results led to the calculation of key properties like coefficients of thermal expansion and entropies, providing insights into the influence of anionic structure on liquid behavior.
- Additionally, the study explored thermal properties and fragility behavior of pyridinium-based ionic liquids, contributing to the understanding of ion behavior in these fluids.
Molecular ions of ionic liquids in the gas phase.
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September 2008
Institute of Organic Chemistry, University of Heidelberg, Heidelberg, Germany.
Ionic liquids form neutral ion pairs (CA) upon evaporation. The softness of the gas-phase ionization of field ionization has been used to generate "molecular ions," CA(+*), of ionic liquids, most probably by neutralization of the anion. In detail, 1-ethyl-3-methylimidazolium-thiocyanate, [C(6)H(11)N(2)](+) [SCN](-), 1-butyl-3-methylimidazolium-tricyanomethide, [C(8)H(15)N(2)](+) [C(4)N(3)](-), N-butyl-3-methylpyridinium-dicyanamide, [C(10)H(16)N](+) [C(2)N(3)](-), and 1-butyl-1-methylpyrrolidinium-bis[(trifluormethyl)sulfonyl]amide, [C(9)H(20)N](+) [C(2)F(6)NO(4)S(2)](-) were used.
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