Infrared spectra of deuterated crystalline modifications of cellulose were compared mutually.
In our previous works, it was considered that chain conformation in cellulose I family modifications (I, IIII and IVI) was "bent", form, and that in cellulose II family (II, IIIII and IVII) was "bent-twisted" form. While, there was similarity in unit cell dimentions, with respect to the state of chain packing, among cellulose I, IVI and IVII, and cellulose II, IIIIand IIIII.
Based on the similarity and the difference among their infrared spectra, the relationships between absorption band and crystalline structure were investigated. The results are summarized in Table 1. Crista11ine modifications in cellulose I and II family showed one and two OH stretching band, respectively, fitted to O 3 → O 5', intramolecular hydrogen bonds. This fact corresponded with that the chain conformation of "bent" and "bent-twisted" form had one and two kinds of O 3 → O 5', respectively.
It was considered that cellulose I and IVI had O 6 - O5 O1 intermolecular hydrogen bonds between corner and center chain in unit cell, and this fact caused the week C1 groups stretching band at 859 cm-1, the strong CH2 bending band at 1430 cm-1 and the shift to the lower wave number side of O 3 → O 5' OH stretching band, on I and IVI.
Wave numbers of O 3 → O 5' OD stretching band on cellulose I and II family were different between them and the same in each.