Measurement of the hydrogen bond acceptance of ionic liquids and green solvents by the 19 F solvatomagnetic comparison method
Résumé
The 19 F solvatomagnetic comparison method yields a more reliable scale (β1) of solvent hydrogen-bond acceptance than the solvatochromic comparison method. For [C4mim] based ionic liquids, the β1 order MeCO2 − (1.30) > Cl − (0.79) > NO3 − (0.67) > SCN − (0.64) > I − (0.44) > BF4 − (0.36) > PF6 − (0.27) is significantly correlated to the intrinsic hydrogen-bonding-, and even proton-, basicities of anions. For solvents of green interest, the β1 value of water is now settled down to 0.37, the newly determined value of limonene is 0.15, while those of α-pinene (0.14), glycerol (0.36), Cyrene TM (0.40), 2methyltetrahydrofuran (0.66), ethyl lactate (0.58), and γ-valerolactone (0.52) are found chemically more relevant than the solvatochromic ones.
Domaines
Chimie théorique et/ou physiqueOrigine | Fichiers produits par l'(les) auteur(s) |
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