Cation–anion–water interactions in aqueous mixtures of imidazolium based ionic liquids

Intermolecular interactions in mixtures of 1-n-butyl-3-methylimidazolium acetate and water: Insights from IR, Raman, NMR spectroscopy and quantum chemistry calculations

“…When water is added to BmimAc, they decrease with a larger extent for the C (2,4,5) -H, indicating an increase of the electron density. This behavior of the 1 H and 13 C chemical shifts of the ring atoms correlates well with the blue shift of the corresponding vibrational modes [41,80,81,[83][84][85][86][87][88][89][90]. The blue shift of the ν(C (2,4,5) -H) as a function of decreasing X BmimAc as well as the decrease of the corresponding 1 H and 13 C chemical shift is compatible with the physical picture that the interactions between the acetate anion and the Bmim + are gradually weakened because of the concomitant increasing predominance of the interactions between water molecules and the COO − moiety of the Ac − over both those between water molecules and between water and the Bmim + .…”

“…The position of these IR vibrational modes blue shifts slightly upon dilution with water particularly at low BmimAc content. The study of the literature data shows that the region above 3000 cm −1 is very sensitive to the interactions involving the C (n) -H m of the imidazolium ring of Bmim + [6,8,39,69,70,80,81]. Indeed, Fig.…”

Effect of the Cation on the Interactions between Alkyl Methyl Imidazolium Chloride Ionic Liquids and Water

“…46,48,94 The normalized spectra in the OH stretching regions for the studied alkyl methyl imidazolium chloride− water systems are depicted in Figure 5 Figure S6). As part of this study to understand the molecular interaction of water and ILs, we monitored the changes in the water spectrum in the presence of ILs species, that is, cation and anion.…”

Biocoacervation extraction combined with dispersive solid phase extraction using a reversed-phase core–shell magnetic molecularly imprinted sorbent for 2,4-dichlorophenoxyacetic acid prior to its determination by HPLC

“…One of the interactions between water and imidazolium-based ionic liquids is the hydrogen bond. Water molecules interact with the ionic liquid clusters without forming a hydrogen bond network among themselves [24]. With addition of water, ionic liquid desorption of the rhamnilipid increases the hydrophobic-hydrophobic interactions and this helps to increase the microassemblies.…”