Cellulose-hydrazine complexes, unit cells

Proposed Unit Cells for Cellulose Hydrazine Complexes ... 

Unit cells of pure cellulose fall into five different classes, I—IV and x. This organization, with recent subclasses, is used here, but Cellulose x is not discussed because there has been no recent work on it. Crystalline complexes with alkaU (50), water (51), or amines (ethylenediamine, diaminopropane, and hydrazine) (52), and crystalline cellulose derivatives also exist. Those stmctures provide models for the interactions of various agents with cellulose, as well as additional information on the cellulose backbone itself. Usually, as shown in Eigure la, there are two residues in the repeated distance. However, in one of the alkah complexes (53), the backbone takes a three-fold hehcal shape. Nitrocellulose [9004-70-0] heUces have 2.5 residues per turn, with the repeat observed after two turns (54). 

The unit cells determined in this and other laboratories for cellulose I and II complexes with ehtylenediamine and hydrazine are listed in tables 1 and 2. Table 3 shows our unit cells for the 1,2- and 1,3- diaminopropane complexes for which there have been no previous proposals. 

As can be seen in table 2, a number of unit cells have been proposed for cellulose I-hydrazlne complexes over the years. Some of this diversity is almost certainly due to poor quality data, which can be Indexed in different ways. Nevertheless, visual comparison shows that our patterns are significantly different from those published previously, which probably reflects the fact that we used hydrazine containing no more than 3% water, as compared to up to 40% in earlier work. So far we have prepared three different cellulose Il-hydrazlne complexes, two for Fortisan (designated A and B) and one for Mercerized ramie. There may be some rationale for this complex A has only been obtained using anhydrous hydrazine, and the Fortisan and Mercerized ramie have different morphologies. However, it seems likely that all three complexes can be formed by both specimens once the preparation conditions are better understood. 

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