Apparent molar volumes of crown ether complexes in several solvents at 25�C. An estimation of ionic electrostriction
| Autor: | Robert L. Kay, T. M. Letcher, James J. Paul |
|---|---|
| Rok vydání: | 1991 |
| Předmět: |
chemistry.chemical_classification
Electrostriction Chemistry 18-Crown-6 Inorganic chemistry Biophysics Partial molar property Biochemistry Apparent molar property Dilution Solvent chemistry.chemical_compound Molar volume Physical chemistry Physical and Theoretical Chemistry Molecular Biology Crown ether |
| Zdroj: | Journal of Solution Chemistry. 20:1001-1016 |
| ISSN: | 1572-8927 0095-9782 |
| Popis: | The apparent molar volumes of equimolar concentrations of 18-crown-6-ether (CE) or dibenzo-18-crown-6-ether (B2CE) and MCl (M=Na, K, or Cs) or MI in dilute solutions of anhydrous methanol, acetonitrile and dimethylsulfoxide have been calculated from density data measured at 25°C. After extrapolation to infinite dilution these results together with the apparent molar volumes of the crown ethers and the alkali metal halides were used to calculate the limiting partial molar volume change for the formation of the complexes. By noting that the charge of the complexed cation has been shown to be completely shielded from the solvent, the volume of complexation can be assumed to be a good estimation of the volume change due to electrostriction of the solvent by the cationic charge. The results are compared to the predictions of the Hepler equation. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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