Second derivative F.t.-i.r. spectra of celluloses I and II and related mono- and oligo-saccharides

Abstract Second derivatives F.t.-i.r. bands in the OH and CH stretching regions of the spectra of celluloses I and II and of related mono- and oligo-saccharides are much sharper than those in normal absorption spectra and the improved resolution enables more precise measurements of their frequencies. A multiplicity of bands was found in the OH stretching region, which indicated coupling. A much simpler pattern of bands was observed in the OD stretching region of the lightly deuterated compounds, indicating decoupling of the vibrations. There was a close correspondence between the peaks in the second derivative mode in the OH stretching regions of the spectra of cellotetraose and cellulose II, in agreement with postulates of a strong resemblance between their structures.