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Estimates of Internal Pressure and Molar Refraction of Imidazolium Based Ionic Liquids as a Function of Temperature

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Abstract

Estimates of the internal pressure (∂ U/∂ V) T of the ionic liquids (ILs) 1-butyl-3-methylimidazolium tetrafluoroborate [BMIM][BF4], 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM][PF6], and 1-methyl-3-octylimidazolium tetrafluoroborate [OMIM][BF4] were made from experimentally determined densities and speeds of sound in the temperature range 283.15 to 343.15 K. Values (∂ U/∂ V) T for all the ILs studied are higher than those of water and molecular organic liquids. We also measured the refractive indices n D in the temperature range 288.15 to 343.15 K and estimated the molar refraction R M. Refractive indices of ILs were also higher than those of normal organic liquids but were comparable to those of long hydrocarbon chain organic solvents.

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  1. Central Salt and Marine Chemicals Research Institute, Bhavnagar, 364002, India

    Arvind Kumar

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  1. Arvind Kumar
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Correspondence to Arvind Kumar.

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Kumar, A. Estimates of Internal Pressure and Molar Refraction of Imidazolium Based Ionic Liquids as a Function of Temperature. J Solution Chem 37, 203–214 (2008). https://doi.org/10.1007/s10953-007-9231-5

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  • DOI: https://doi.org/10.1007/s10953-007-9231-5

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