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Indian Journal of Chemistry -Section A (IJC-A) >
IJC-A Vol.46A [2007] >
IJC-A Vol.46A(07) [July 2007] >
| Title: | Autoprotolysis constants of ethylene glycol in isodielectric mixtures of ethylene glycol and N, N-dimethyl formamide at 298.15 K and the related Gibbs energies of transfer |
| Authors: | Dolui, B K
Bhattacharya, S K
Kundu, K K |
| Issue Date: | Jul-2007 |
| Publisher: | CSIR |
| Abstract: | Autoprotolysis constants (Ks) of ethylene glycol (EgOH) have been determined in the isodielectric mixtures of protic ethylene glycol and dipolar aprotic N,N-dimethyl formamide (20, 40 and 60 wt% DMF) at 298.15 K from emf measurements of cells comprising glass GE (H⁺) and Ag-AgCl electrodes. Transfer Gibbs energies of glycoxide ion (EgO-), ΔG⁰t (EgO-) have been evaluated therefrom using literature values of transfer Gibbs energies of H⁺, ΔG⁰t (H⁺) based on TATB assumption. These are explained in the light of ion-solvent interactions as guided by physicochemical properties of the solvents. The results show that while the acidity of EgOH + DMF mixed solvents decreases with co-solvent due to the increased aproticity and anionophobicity of the cosolvent molecules, the basicity decreases due to the amalgamated effects of increased aproticity as well as increased protophilicity of DMF. |
| Page(s): | 1081-1089 |
| ISSN: | 0376-4710 |
| Source: | IJC-A Vol.46A(07) [July 2007]
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