Influence of Counter Anions on Inclusion Complexation of p-Sulfonatocalix[6]arene with 1-Butyl-3-methylimidazolium Salts (Ionic Liquids)
| Autor: | Sho Tamaki, Tadashi Hanaya, Shono Fujitani, Yusaku Honda, Naoya Inazumi, Yoshimi Sueishi |
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| Rok vydání: | 2015 |
| Předmět: |
Inorganic chemistry
02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound chemistry Computational chemistry Ionic liquid Physical and Theoretical Chemistry Inclusion (mineral) 0210 nano-technology 1-butyl-3-methylimidazolium |
| Zdroj: | Zeitschrift für Physikalische Chemie. 230:1153-1164 |
| ISSN: | 2196-7156 0942-9352 |
| DOI: | 10.1515/zpch-2015-0611 |
| Popis: | Using the inclusion complexation of methylene blue with p-sulfonatocalix[6]arene (Calix-S6) as a chemical indicator, the association constants of inclusion complexes of Calix-S6 with visible-spectroscopically inert 1-butyl-3-methylimidazolium salts (ionic liquids (IL): counter anions BF4 – , PF6 – , and Cl – ) were determined. It was found that the experimentally observed association constants of IL with Calix-S6 in a water-methanol mixture increased in the order of counter anion Cl – 4 – 6 – . The 19F NMR signals of counter anions BF4 – and PF6 – shift upfield upon addition of Calix-S6. From the 19F NMR chemical shifts, we suggested that Calix-S6 forms weak 1:1 complexes with the BF4 – and PF6 – anions. The binding constants and their thermodynamic parameters for the complexation of the BF4 – and PF6 – anions with Calix-S6 were evaluated in a water-methanol mixture (6:4 (V/V)) at 298 K: K A = 26.2 M –1 for BF4 – and 106 M –1 for PF6 – . Based on the results, the characteristics for the complexation of the counter anions with Calix-S6 were discussed and the inclusion constants of Calix-S6 with the cationic ring moiety of 1-butyl-3-methyl-imidazolium salts were determined. |
| Databáze: | OpenAIRE |
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