The Synthesis and Infrared and Nuclear Magnetic Resonance Spectra of Ammonium Dicyanamide

Molecular Assembling in Mixtures of Hydrophilic 1-Butyl-1-Methylpyrrolidinium Dicyanamide Ionic Liquid and Water

“…Around 2200cm −1 one would computationally expect a triply degenerate absorption band with a high intensity due to DCA. In the real ionic liquid, the triple degeneracy is removed and three strong absorption bands centered around 2130, 2190 and 2230cm −1 are detected, similarly to the case of other ILs containing dicyanamide [34][35][36][37]. All the other absorption bands between 600 and 3200cm −1 can be attributed to the vibrations of the PYR14 anion, in particular CH bending and stretching modes are visible in the regions 1350-1500 and 2800-3200cm −1 , respectively.…”

“…In hydrophilic 1-butyl-3-methylimidazolium dicyanamide (bmim DCA) the crystallization was previously suppressed by adding a much smaller concentration of bidistilled water (2.45wt%, i.e., 0.024 molecules of water per ionic couple) [32]. In order to study quantitatively the microstructure evolution of the sample as a function of T, we performed a detailed investigation of the dependence on T of the peak position, width and intensity of some significant bands: (1) the absorption around 1310 cm −1 , that was attributed to the asymmetric stretching mode of the bridging N and C atoms of the anion [35][36][37][38]; (2) the absorptions around 2230cm −1 , attributed to the triple bond between the C and the terminal N atoms of the anion [35][36][37][38]; (3) the OH stretching bands between 3200 and 3600cm −1 , coming from undesired water. For the OH bands, three contributions were considered, centered around 3500, 3440 and 3270 cm −1 at the In order to study quantitatively the microstructure evolution of the sample as a function of T, we performed a detailed investigation of the dependence on T of the peak position, width and intensity of some significant bands: (1) the absorption around 1310 cm −1 , that was attributed to the asymmetric stretching mode of the bridging N and C atoms of the anion [35][36][37][38]; (2) the absorptions around 2230 cm −1 , attributed to the triple bond between the C and the terminal N atoms of the anion [35][36][37][38];…”

“…The interaction of water and the ionic liquid can be investigated by comparing the position of the vibrational bands when different concentrations of solvent are present in the sample. In the previous literature it has been reported that water mainly interacts with the anion of ILs [8,[20][21][22][23][24][25][26] Indeed, Figure 8 displays a comparison of the spectra of PYR 14 -DCA and PYR 14 -DCA + H 2 O at 300 K and 160 K in the region 1250-2300 cm −1 , where one finds the absorption around 1310 cm −1 , that was attributed to the asymmetric stretching mode of the bridging N and C atoms of the anion and the absorptions around 2230 cm −1 , attributed to the triple bond between the C and the terminal N atoms [35][36][37][38]. The three bands due to the anion shift toward higher frequencies in the intentionally hydrated sample by~6 cm −1 .…”

“…[ [35][36][37][38]. The three bands due to the anion shift toward higher frequencies in the intentionally hydrated sample by ~6cm −1 .…”

Synthesis of Few-Layer Graphene by Peeling Graphite Flakes via Electron Exchange in Solution Plasma

“…Bands were observed at 2237, 2198, and 2139 cm −1 , corresponding to the stretching vibrations of the CN bonds in the DCA anion. 36,40 Also, bands were observed at 2237, 2198, and 2139 cm −1 , corresponding to the antisymmetric (C− N) and symmetric (C−N) stretching vibrations, symmetric CN stretching, and antisymmetric CN stretching, respectively. 37 The CN and CC stretching vibrations of the imidazole groups were observed at 1630 and 1572 cm −1 , respectively, which overlapped with the aromatic CC stretching vibration from graphite.…”