引用本文:
Jie LU, Jie KE, Bu Xing HAN, Hai Ke YAN. Local Dielectric Constant of the Solvent Shell Surrounding Ethyl Acetoacetate in Cosolvent-Modified Supercritical Carbon Dioxide[J]. Chinese Chemical Letters,
1997, 8(4): 327-330.
Citation: Jie LU, Jie KE, Bu Xing HAN, Hai Ke YAN. Local Dielectric Constant of the Solvent Shell Surrounding Ethyl Acetoacetate in Cosolvent-Modified Supercritical Carbon Dioxide[J]. Chinese Chemical Letters, 1997, 8(4): 327-330.
Citation: Jie LU, Jie KE, Bu Xing HAN, Hai Ke YAN. Local Dielectric Constant of the Solvent Shell Surrounding Ethyl Acetoacetate in Cosolvent-Modified Supercritical Carbon Dioxide[J]. Chinese Chemical Letters, 1997, 8(4): 327-330.
Local Dielectric Constant of the Solvent Shell Surrounding Ethyl Acetoacetate in Cosolvent-Modified Supercritical Carbon Dioxide
摘要:
The enol contents and equilibrium constants for keto-enol tautomerism of ethyl acetoacetate in supercritical (SC) CO2 with and without cosolvent ethanol and in various liquid solvents were investigated by UV spectroscopy.The local dielectric constant about the solute in SC CO2/ethanol system was obtained through the correlation between Gibbs free energy of tautomerism and Onsager-Kirkwood solvent quantin.The great difference between local dielectric constant and that calculated from homogeneous dielectric medium theory suggests clustering of the cosolvent around the solute.
English
Local Dielectric Constant of the Solvent Shell Surrounding Ethyl Acetoacetate in Cosolvent-Modified Supercritical Carbon Dioxide
Abstract:
The enol contents and equilibrium constants for keto-enol tautomerism of ethyl acetoacetate in supercritical (SC) CO2 with and without cosolvent ethanol and in various liquid solvents were investigated by UV spectroscopy.The local dielectric constant about the solute in SC CO2/ethanol system was obtained through the correlation between Gibbs free energy of tautomerism and Onsager-Kirkwood solvent quantin.The great difference between local dielectric constant and that calculated from homogeneous dielectric medium theory suggests clustering of the cosolvent around the solute.
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