By Rostislav Georgievich Zhbankov (auth.)
This monograph is worried with systematization of the infrared spectra of an immense average polymer, cellulose, and its derivatives. The infrared spectra of the most periods of cellulose derivatives are de scribed and interpreted and people of such version compounds as mono-, di-, and trisaccharides are thought of. massive cognizance is given to prob lems of approach in acquiring infrared spectra of fibrous cellulose fabrics, and to the analytical chances of infrared spectroscopy in reports of the homes of cellulose and its derivatives. The e-book may be of use to clinical and plant employees attracted to the learn and remedy of cellulose, compounds regarding cellulose (carbo hydrates and polycarbohydrates), and different polymers. v creation Spectroscopy has these days received nice clinical and useful im portance. Its probabilities are in keeping with the specificity of the emission and ab sorption spectra of all kinds of fabric, from components to advanced ordinary items. most generally used are the tools of emission spectral research (analysis of the emission spectrum from an incandescent body). The rapidity and availability of those tools, including their excessive sensitivity and selectivity, has made them vital within the perform of plant and scien tific laboratories for constructing the presence of particular parts in a sub stance lower than investigation.
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Example text
9. Values characterizing width. The Bouguer-Lambert-Beer law is the shape and intensity of an only strictly correct for monochromatic rainfrared absorption band. 1) diation. However , the use in infrared True absorption band; 2) abspectrometers of a radiation source with a sorption band altered by finite continuous spectrum makes it impossible slit width. e Vmax = intensity to obtain strictly monochromatic radiation. v l = half slit width. cy v, the radiation passing through the exit slit of the monochromator will cover some range of frequency v ± D.
V. Ivanova, have shown that it is easiest to investigate special features in the hydrogen bonding of OH groups in carbohydrates by obtaining the spectra at low temperatures, such as liquid nitrogen temperature. Under these conditions, the OH bands split up into sharper components and there are fairly marked shifts to longer wavelengths. The latter give useful additional information on the nature of the hydrogen bonding. It is clear from the spectra shown in Fig. 24 (see also Appendix I, 1-9) that a change in the stereochemical positioning of even one of the hydroxyl groups leads to a marked change in the spectrum over the whole analytical range of 400-3600 cm-1 .
The spectrum in this region alters considerably with the change to 13 -D-arabinose; two sharp bands appear at 2950 and 2940 em -1 , while the band at 2890 em -1 vanishes. The spectrum of rhamnose shows three sharp bands, of approximately equal intensity, at 2890 and 2940 cm-1 , and a doublet at 2970-2980 cm- 1 . Two, if not all three, of these bands must be attributed to symmetric and asymmetric stretching vibrations of methyl groups. The spectrum of D-glucose-6-phosphate (barium salt) shows only one weak band, at about 2920 em -1 , in the 2800-3000 em -1 region.