Effect of a medium on complexation between cations and crown ethers
Bondarev, NV; Kabakova, EN; El'tsov, SV; Zaitseva, IS
| HERO ID | 1157466 |
|---|---|
| In Press | No |
| Year | 2003 |
| Title | Effect of a medium on complexation between cations and crown ethers |
| Authors | Bondarev, NV; Kabakova, EN; El'tsov, SV; Zaitseva, IS |
| Journal | Russian Journal of Physical Chemistry A, Focus on Chemistry |
| Volume | 77 |
| Issue | 10 |
| Page Numbers | 1601-1606 |
| Abstract | A comparative quantitative analysis of the effects of aqueous organic solvents (water-methanol, water-propan-2-ol, water-acetonitrile, water-dioxane, and water-acetone) on the complexation between sodium, potassium, and ammonium cations and 18-crown-6 (18C6), dibenzo-18-crown-6 (DB18C6), and dicyclohexyl-18-crown-6 (DCH 18C6) ethers was performed in terms of thermodynamic and empirical approaches. In solution, the crown ethers studied form enthalpy-stabilized complexes and complexes with mixed enthalpy-entropy stabilization. The thermodynamic parameters of reagent solvation can affect the stability of NH4+, Na+, and K+ complexes with crown ethers in five ways. It was demonstrated that a changed stability of potassium coronates in water-methanol mixtures is differently contributed by the structure-sensitive parameters of complexation (the enthalpy and entropy of reagent solvation). Changes in the conformational Gibbs energy of solvation of 18C6 and DB18C6 were calculated. Thermodynamic aspects of hypothetical processes in cation extraction with crown ethers were considered. Stabilization of ammonium, sodium, and potassium coronates in aqueous organic solvents was explained, in terms of the nonthermodynamic concept of linear free-energy relations. by a decreased cohesion energy density of solvents.< |
| Wosid | WOS:000185914300010 |
| Url | https://www.scopus.com/inward/record.uri?eid=2-s2.0-0242521393&partnerID=40&md5=90ab8a8179ad57c00a2ae280cac91c0e |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Source: Web of Science 000185914300010 Journal:RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY |
| Is Public | Yes |
| Language Text | English |
| Is Qa | No |