Hydrogen bonding in ethyl carbamate studied by IR spectroscopy

Polymorphic behavior of isonicotinamide in cooling crystallization from various solvents

“…For the FTIR spectra changes in the INA peaks were found in the solutions of methanol, acetonitrile and ethyl acetate. As seen inFigure 7, the spectra of INA in methanol and to some degree in acetonitrile show a peak around 1640-1630 cm -1 , this peak has previously been linked to the N-H bending vibration of the primary amine which denotes the presence of amide-to-amide homosynthons[24][14].This suggests that the INA dimers have been formed in the solutions in methanol and to a lesser extent in acetonitrile, whereas no significant peak is seen in the acetone solution, indicating that the dimer associated with form 1 is not present in the acetone solution. The spectra for INA in acetonitrile are largely similar to that of INA in acetone, although the acetone solution does show a more distinct peak at 1227cm -1 that could be linked to an interaction between the C=O of acetone and N-H of INA.…”

DFT study and quantitative detection by surface‐enhanced Raman scattering (SERS) of ethyl carbamate

“…In recent years, vibrational spectroscopic methods such as Fourier transform infrared spectroscopy and Raman spectroscopy, were increasingly used for the evaluation of the food safety and quality because of their analytical sensitivity and versatility. Vibrational studies including infrared spectroscopy spectra and MINDO/3, HF, B3LYP, and MP2 level of theory calculations were reported for urethanes or for EC in particular by several groups: Suchkova and Maklakov, Alekseev et al ., and Furer . Because urethane groups differ from an amide group only by an additional oxygen atom, the nature of the ‘amide bands’ and their behavior with respect to hydrogen bonding were mainly investigated.…”

“…Vibrational studies including infrared spectroscopy spectra and MINDO/3, HF, B3LYP, and MP2 level of theory calculations were reported for urethanes or for EC in particular by several groups: Suchkova and Maklakov, [12] Alekseev et al, [13] and Furer. [14] Because urethane groups differ from an amide group only by an additional oxygen atom, the nature of the 'amide bands' and their behavior with respect to hydrogen bonding were mainly investigated.…”

Development of solvent-free synthesis of hydrogen-bonded supramolecular polyurethanes

“…S10 and S11 † for details). At higher concentrations, gelation occurred after 10 minutes indicating formation of a cross-linked network, (potentially through lateral hydrogen bonding of carbamate groups) 50 preventing further conversion of starting materials. The lowest concentration gave the best result (100% conversion to product at 0.01 M).…”