Study of IR spectra of?-D-glucose at liquid helium temperature

Infrared spectroscopic study of triacetyl‒β‒cyclodextrin and its inclusion complex with nicardipine

“…Some interesting studies were reported on the hydration and dehydration processes [2,7] and thermal stability of β-CD [8] or hydrophobically modified β-CD [9]. In order to clarify the nature of the bands that appear in the 4000-3000 cm −1 spectral region, infrared spectra at low temperature (liquid nitrogen and liquid helium) were reported [10]. From these experimental data, Fourier self-deconvolution and band fitting procedures, the number of the components in the 4000-3000 cm −1 spectral region was determined and an assignment of these O-H stretching bands appearing there was performed [1].…”

Resolution Enhancement in IR Spectra of Carbohydrates by the Deconvolution Method and Comparison of the Results with Low-Temperature Spectra

“…Powdered samples were dispersed in KBr pellets and recorded with an instrumental resolution of 2 cm 2 1 and an averaging of 256 scans on the FT-IR spectrometer and a resolution of 3 cm 2 1 on the Jasco spectrophotometer. The technique of obtaining low-temperature spectra of the investigated compounds has been described by Korolik et al 7 Regularized M ethod of Deconvolution. Deconvolution of the IR spectra being studied was performed with the use of the regularized m ethod whose theory had been considered in the preceding papers.…”

“…One way of enhancing the resolution of overlapping bands can be achieved by vibrational spectra at a low temperature of the sample. It is known [3][4][5][6][7][8][9] that lowering of the sample temperature leads to certain enhancement in the resolution of vibrational spectra of carbohydrates, a change in peak intensities, as well as to shifts of the maxima positions of a number of bands. This feature enables previously unresolved components to be separated.…”

“…This feature enables previously unresolved components to be separated. The IR spectra of carbohydrates were obtained at both liquid nitrogen [3][4][5] and liquid helium [6][7][8][9] temperatures. All the above changes were shown [7][8][9] to be more pronounced in the spectra obtained at liquid helium temperature.…”

“…The low-temperature spectra were supplied by Korolik and co-workers. [7][8][9] The aim of the present work is to perform analysis of the result of deconvolution of the IR spectra of m ono-, di-, and polysaccharides as well as to make comparison with IR spectra obtained at room and helium temperatures and with the data of norm al coordinate analysis of the corresponding molecules.…”