Thermodynamic and conductivity properties of acetic acid - EMIMOAc ionic liquid solutions

Celina M. Renda; Yash K. Patel; Lance R. Henshaw; Kyle T. Munson; Olivia C. Fiebig; Anh T. Tran; Jeremy Shriver; Judith Cruz; Lei Yu; Timothy D. Vaden

doi:10.1016/j.molliq.2016.01.015

Thermodynamic and conductivity properties of acetic acid - EMIMOAc ionic liquid solutions

Celina M. Renda, Yash K. Patel, Lance R. Henshaw, Kyle T. Munson, Olivia C. Fiebig, Anh T. Tran, Jeremy Shriver, Judith Cruz, Lei Yu, Timothy D. Vaden

Chemistry

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

Acetic acid (HOAc) is a typical weak Brønsted acid that has been broadly used as a reactant in esterification reactions and can be used as such in ionic liquid (IL) solutions. The nature of the HOAc molecule as a solute in the IL 1-ethyl-3-methylimidazolium acetate (EMIMOAc) solutions was investigated with thermodynamic, vibrational spectroscopic, conductivity, and viscosity measurements. Calorimetry and vapor pressure-based thermodynamic measurements of the binary HOAc-EMIMOAc mixture were used to quantify the exothermic enthalpy of solution, ΔH_sol, as ~ 3.2-4.9 kJ/mol. FTIR and Raman spectroscopy showed that the structures of the HOAc molecule and IL molecular ions are unchanged in the solutions relative to the pure liquids, indicating that the HOAc is a negligibly-dissociated weak acid in the IL solutions. Temperature-dependent conductivity measurements quantify the effects of the HOAc on the IL solution conductivity and confirm that the HOAc remains a mostly neutral molecular solute that interacts with the EMIMOAc IL via ion-dipole and hydrogen bond interactions.

Original language	English (US)
Pages (from-to)	710-715
Number of pages	6
Journal	Journal of Molecular Liquids
Volume	216
DOIs	https://doi.org/10.1016/j.molliq.2016.01.015
State	Published - Apr 1 2016

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Spectroscopy
Physical and Theoretical Chemistry
Materials Chemistry

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10.1016/j.molliq.2016.01.015

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@article{f505b081d29b44568a6f80601d259bbf,

title = "Thermodynamic and conductivity properties of acetic acid - EMIMOAc ionic liquid solutions",

abstract = "Acetic acid (HOAc) is a typical weak Br{\o}nsted acid that has been broadly used as a reactant in esterification reactions and can be used as such in ionic liquid (IL) solutions. The nature of the HOAc molecule as a solute in the IL 1-ethyl-3-methylimidazolium acetate (EMIMOAc) solutions was investigated with thermodynamic, vibrational spectroscopic, conductivity, and viscosity measurements. Calorimetry and vapor pressure-based thermodynamic measurements of the binary HOAc-EMIMOAc mixture were used to quantify the exothermic enthalpy of solution, ΔHsol, as ~ 3.2-4.9 kJ/mol. FTIR and Raman spectroscopy showed that the structures of the HOAc molecule and IL molecular ions are unchanged in the solutions relative to the pure liquids, indicating that the HOAc is a negligibly-dissociated weak acid in the IL solutions. Temperature-dependent conductivity measurements quantify the effects of the HOAc on the IL solution conductivity and confirm that the HOAc remains a mostly neutral molecular solute that interacts with the EMIMOAc IL via ion-dipole and hydrogen bond interactions.",

author = "Renda, {Celina M.} and Patel, {Yash K.} and Henshaw, {Lance R.} and Munson, {Kyle T.} and Fiebig, {Olivia C.} and Tran, {Anh T.} and Jeremy Shriver and Judith Cruz and Lei Yu and Vaden, {Timothy D.}",

note = "Publisher Copyright: {\textcopyright} 2016 Published by Elsevier B.V.",

year = "2016",

month = apr,

day = "1",

doi = "10.1016/j.molliq.2016.01.015",

language = "English (US)",

volume = "216",

pages = "710--715",

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T1 - Thermodynamic and conductivity properties of acetic acid - EMIMOAc ionic liquid solutions

AU - Renda, Celina M.

AU - Patel, Yash K.

AU - Henshaw, Lance R.

AU - Munson, Kyle T.

AU - Fiebig, Olivia C.

AU - Tran, Anh T.

AU - Shriver, Jeremy

AU - Cruz, Judith

AU - Yu, Lei

AU - Vaden, Timothy D.

PY - 2016/4/1

Y1 - 2016/4/1

N2 - Acetic acid (HOAc) is a typical weak Brønsted acid that has been broadly used as a reactant in esterification reactions and can be used as such in ionic liquid (IL) solutions. The nature of the HOAc molecule as a solute in the IL 1-ethyl-3-methylimidazolium acetate (EMIMOAc) solutions was investigated with thermodynamic, vibrational spectroscopic, conductivity, and viscosity measurements. Calorimetry and vapor pressure-based thermodynamic measurements of the binary HOAc-EMIMOAc mixture were used to quantify the exothermic enthalpy of solution, ΔHsol, as ~ 3.2-4.9 kJ/mol. FTIR and Raman spectroscopy showed that the structures of the HOAc molecule and IL molecular ions are unchanged in the solutions relative to the pure liquids, indicating that the HOAc is a negligibly-dissociated weak acid in the IL solutions. Temperature-dependent conductivity measurements quantify the effects of the HOAc on the IL solution conductivity and confirm that the HOAc remains a mostly neutral molecular solute that interacts with the EMIMOAc IL via ion-dipole and hydrogen bond interactions.

AB - Acetic acid (HOAc) is a typical weak Brønsted acid that has been broadly used as a reactant in esterification reactions and can be used as such in ionic liquid (IL) solutions. The nature of the HOAc molecule as a solute in the IL 1-ethyl-3-methylimidazolium acetate (EMIMOAc) solutions was investigated with thermodynamic, vibrational spectroscopic, conductivity, and viscosity measurements. Calorimetry and vapor pressure-based thermodynamic measurements of the binary HOAc-EMIMOAc mixture were used to quantify the exothermic enthalpy of solution, ΔHsol, as ~ 3.2-4.9 kJ/mol. FTIR and Raman spectroscopy showed that the structures of the HOAc molecule and IL molecular ions are unchanged in the solutions relative to the pure liquids, indicating that the HOAc is a negligibly-dissociated weak acid in the IL solutions. Temperature-dependent conductivity measurements quantify the effects of the HOAc on the IL solution conductivity and confirm that the HOAc remains a mostly neutral molecular solute that interacts with the EMIMOAc IL via ion-dipole and hydrogen bond interactions.

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U2 - 10.1016/j.molliq.2016.01.015

DO - 10.1016/j.molliq.2016.01.015

M3 - Article

AN - SCOPUS:84958211819

SN - 0167-7322

VL - 216

SP - 710

EP - 715

JO - Journal of Molecular Liquids

JF - Journal of Molecular Liquids

ER -

Thermodynamic and conductivity properties of acetic acid - EMIMOAc ionic liquid solutions

Abstract

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