Ionic liquids as novel guests for cucurbit[6]uril in neutral water

Abstract

Cucurbit[6]uril was dissolved through encapsulation of an imidazolium-based ionic liquid guest in a pure water environment and the dissolution ability could be tuned by augmenting the imidazolium structure.

Capture of Carbon Dioxide by Cucurbit[7]uril Complex

“…The reactions of amines with CO 2 in water for a long time are inclined to form bicarbonate as primary product, however the conversions are hardly complete with a little side product of carbamate, for they are equilibrium reactions. In our model experiment, NH 2 (CH 2 ) 6 NH 2 reacted with CO 2 in aqueous solution, leading to carbamate product first and then bicarbonate, which were demonstrated by the appearance of carbonyl signals on 13 C NMR spectra at δ 164.5 and 159.9 ppm, respectively.…”

“…For reaction of NH 2 (CH 2 ) 6 NH 2 CB [7] complex with CO 2 in aqueous solution, the new resonance signal on 13 C NMR spectrum at δ 159.8 ppm was assigned to bicarbonate as the only product of CO 2 fixation, while carbamate product was not detected.…”

“…The highly pure CO 2 (99.999%) was obtained from local supplier. 1 H and 13 C NMR spectra were recorded on Bruker DRX-400 spectrometer for 1 H at 400 MHz and for 13 C at 100 MHz.…”

Supramolecular Structures in the Presence of Ionic Liquids

“…The interaction of CB6 and [C n mim]Br was found to significantly increase the solubility of CB6 in neutral water . CB6 was pulled into neutral water through encapsulation of an imidazolium-based IL (Liu et al, 2008). According to 1 H NMR titration experiments, C 2 mim + and C 4 mim + demonstrated different binding modes with CB6.…”

Time-Dependent Density Functional Theory Study on a Fluorescent Chemosensor Based on C–H•••F Hydrogen-Bond Interaction

“…Accordingly, we can design a fluorescent chemosensor for fluoride anions. In general, free imidazolium do not have visible light absorption [20][21][22][23]. To improve the photoabsorption properties of imidazolium cations, some groups with conjugated structures can be introduced into the imidazolium skeleton [24,25].…”